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| /*! * Knockout JavaScript library v3.3.0 * (c) Steven Sanderson - http://knockoutjs.com/ * License: MIT (http://www.opensource.org/licenses/mit-license.php) */(function(){var DEBUG=true;(function(undefined){    // (0, eval)('this') is a robust way of getting a reference to the global object    // For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023    var window = this || (0, eval)('this'),        document = window['document'],        navigator = window['navigator'],        jQueryInstance = window["jQuery"],        JSON = window["JSON"];(function(factory) {    // Support three module loading scenarios    if (typeof define === 'function' && define['amd']) {        // [1] AMD anonymous module        define(['exports', 'require'], factory);    } else if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {        // [2] CommonJS/Node.js        factory(module['exports'] || exports);  // module.exports is for Node.js    } else {        // [3] No module loader (plain <script> tag) - put directly in global namespace        factory(window['ko'] = {});    }}(function(koExports, amdRequire){// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.var ko = typeof koExports !== 'undefined' ? koExports : {};// Google Closure Compiler helpers (used only to make the minified file smaller)ko.exportSymbol = function(koPath, object) {    var tokens = koPath.split(".");    // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)    // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)    var target = ko;    for (var i = 0; i < tokens.length - 1; i++)        target = target[tokens[i]];    target[tokens[tokens.length - 1]] = object;};ko.exportProperty = function(owner, publicName, object) {    owner[publicName] = object;};ko.version = "3.3.0";ko.exportSymbol('version', ko.version);ko.utils = (function () {    function objectForEach(obj, action) {        for (var prop in obj) {            if (obj.hasOwnProperty(prop)) {                action(prop, obj[prop]);            }        }    }    function extend(target, source) {        if (source) {            for(var prop in source) {                if(source.hasOwnProperty(prop)) {                    target[prop] = source[prop];                }            }        }        return target;    }    function setPrototypeOf(obj, proto) {        obj.__proto__ = proto;        return obj;    }    var canSetPrototype = ({ __proto__: [] } instanceof Array);    // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)    var knownEvents = {}, knownEventTypesByEventName = {};    var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';    knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];    knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];    objectForEach(knownEvents, function(eventType, knownEventsForType) {        if (knownEventsForType.length) {            for (var i = 0, j = knownEventsForType.length; i < j; i++)                knownEventTypesByEventName[knownEventsForType[i]] = eventType;        }    });    var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406    // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)    // Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.    // Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.    // If there is a future need to detect specific versions of IE10+, we will amend this.    var ieVersion = document && (function() {        var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');        // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment        while (            div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',            iElems[0]        ) {}        return version > 4 ? version : undefined;    }());    var isIe6 = ieVersion === 6,        isIe7 = ieVersion === 7;    function isClickOnCheckableElement(element, eventType) {        if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;        if (eventType.toLowerCase() != "click") return false;        var inputType = element.type;        return (inputType == "checkbox") || (inputType == "radio");    }    // For details on the pattern for changing node classes    // see: https://github.com/knockout/knockout/issues/1597    var cssClassNameRegex = /\S+/g;    function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {        var addOrRemoveFn;        if (classNames) {            if (typeof node.classList === 'object') {                addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];                ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {                    addOrRemoveFn.call(node.classList, className);                });            } else if (typeof node.className['baseVal'] === 'string') {                // SVG tag .classNames is an SVGAnimatedString instance                toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);            } else {                // node.className ought to be a string.                toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);            }        }    }    function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {        // obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.        var currentClassNames = obj[prop].match(cssClassNameRegex) || [];        ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {            ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);        });        obj[prop] = currentClassNames.join(" ");    }    return {        fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],        arrayForEach: function (array, action) {            for (var i = 0, j = array.length; i < j; i++)                action(array[i], i);        },        arrayIndexOf: function (array, item) {            if (typeof Array.prototype.indexOf == "function")                return Array.prototype.indexOf.call(array, item);            for (var i = 0, j = array.length; i < j; i++)                if (array[i] === item)                    return i;            return -1;        },        arrayFirst: function (array, predicate, predicateOwner) {            for (var i = 0, j = array.length; i < j; i++)                if (predicate.call(predicateOwner, array[i], i))                    return array[i];            return null;        },        arrayRemoveItem: function (array, itemToRemove) {            var index = ko.utils.arrayIndexOf(array, itemToRemove);            if (index > 0) {                array.splice(index, 1);            }            else if (index === 0) {                array.shift();            }        },        arrayGetDistinctValues: function (array) {            array = array || [];            var result = [];            for (var i = 0, j = array.length; i < j; i++) {                if (ko.utils.arrayIndexOf(result, array[i]) < 0)                    result.push(array[i]);            }            return result;        },        arrayMap: function (array, mapping) {            array = array || [];            var result = [];            for (var i = 0, j = array.length; i < j; i++)                result.push(mapping(array[i], i));            return result;        },        arrayFilter: function (array, predicate) {            array = array || [];            var result = [];            for (var i = 0, j = array.length; i < j; i++)                if (predicate(array[i], i))                    result.push(array[i]);            return result;        },        arrayPushAll: function (array, valuesToPush) {            if (valuesToPush instanceof Array)                array.push.apply(array, valuesToPush);            else                for (var i = 0, j = valuesToPush.length; i < j; i++)                    array.push(valuesToPush[i]);            return array;        },        addOrRemoveItem: function(array, value, included) {            var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);            if (existingEntryIndex < 0) {                if (included)                    array.push(value);            } else {                if (!included)                    array.splice(existingEntryIndex, 1);            }        },        canSetPrototype: canSetPrototype,        extend: extend,        setPrototypeOf: setPrototypeOf,        setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,        objectForEach: objectForEach,        objectMap: function(source, mapping) {            if (!source)                return source;            var target = {};            for (var prop in source) {                if (source.hasOwnProperty(prop)) {                    target[prop] = mapping(source[prop], prop, source);                }            }            return target;        },        emptyDomNode: function (domNode) {            while (domNode.firstChild) {                ko.removeNode(domNode.firstChild);            }        },        moveCleanedNodesToContainerElement: function(nodes) {            // Ensure it's a real array, as we're about to reparent the nodes and            // we don't want the underlying collection to change while we're doing that.            var nodesArray = ko.utils.makeArray(nodes);            var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;            var container = templateDocument.createElement('div');            for (var i = 0, j = nodesArray.length; i < j; i++) {                container.appendChild(ko.cleanNode(nodesArray[i]));            }            return container;        },        cloneNodes: function (nodesArray, shouldCleanNodes) {            for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {                var clonedNode = nodesArray[i].cloneNode(true);                newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);            }            return newNodesArray;        },        setDomNodeChildren: function (domNode, childNodes) {            ko.utils.emptyDomNode(domNode);            if (childNodes) {                for (var i = 0, j = childNodes.length; i < j; i++)                    domNode.appendChild(childNodes[i]);            }        },        replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {            var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;            if (nodesToReplaceArray.length > 0) {                var insertionPoint = nodesToReplaceArray[0];                var parent = insertionPoint.parentNode;                for (var i = 0, j = newNodesArray.length; i < j; i++)                    parent.insertBefore(newNodesArray[i], insertionPoint);                for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {                    ko.removeNode(nodesToReplaceArray[i]);                }            }        },        fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {            // Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile            // them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that            // new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been            // leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.            // So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.            //            // Rules:            //   [A] Any leading nodes that have been removed should be ignored            //       These most likely correspond to memoization nodes that were already removed during binding            //       See https://github.com/SteveSanderson/knockout/pull/440            //   [B] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,            //       and include any nodes that have been inserted among the previous collection            if (continuousNodeArray.length) {                // The parent node can be a virtual element; so get the real parent node                parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;                // Rule [A]                while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)                    continuousNodeArray.splice(0, 1);                // Rule [B]                if (continuousNodeArray.length > 1) {                    var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];                    // Replace with the actual new continuous node set                    continuousNodeArray.length = 0;                    while (current !== last) {                        continuousNodeArray.push(current);                        current = current.nextSibling;                        if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)                            return;                    }                    continuousNodeArray.push(last);                }            }            return continuousNodeArray;        },        setOptionNodeSelectionState: function (optionNode, isSelected) {            // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.            if (ieVersion < 7)                optionNode.setAttribute("selected", isSelected);            else                optionNode.selected = isSelected;        },        stringTrim: function (string) {            return string === null || string === undefined ? '' :                string.trim ?                    string.trim() :                    string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');        },        stringStartsWith: function (string, startsWith) {            string = string || "";            if (startsWith.length > string.length)                return false;            return string.substring(0, startsWith.length) === startsWith;        },        domNodeIsContainedBy: function (node, containedByNode) {            if (node === containedByNode)                return true;            if (node.nodeType === 11)                return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8            if (containedByNode.contains)                return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node);            if (containedByNode.compareDocumentPosition)                return (containedByNode.compareDocumentPosition(node) & 16) == 16;            while (node && node != containedByNode) {                node = node.parentNode;            }            return !!node;        },        domNodeIsAttachedToDocument: function (node) {            return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);        },        anyDomNodeIsAttachedToDocument: function(nodes) {            return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);        },        tagNameLower: function(element) {            // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.            // Possible future optimization: If we know it's an element from an XHTML document (not HTML),            // we don't need to do the .toLowerCase() as it will always be lower case anyway.            return element && element.tagName && element.tagName.toLowerCase();        },        registerEventHandler: function (element, eventType, handler) {            var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];            if (!mustUseAttachEvent && jQueryInstance) {                jQueryInstance(element)['bind'](eventType, handler);            } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")                element.addEventListener(eventType, handler, false);            else if (typeof element.attachEvent != "undefined") {                var attachEventHandler = function (event) { handler.call(element, event); },                    attachEventName = "on" + eventType;                element.attachEvent(attachEventName, attachEventHandler);                // IE does not dispose attachEvent handlers automatically (unlike with addEventListener)                // so to avoid leaks, we have to remove them manually. See bug #856                ko.utils.domNodeDisposal.addDisposeCallback(element, function() {                    element.detachEvent(attachEventName, attachEventHandler);                });            } else                throw new Error("Browser doesn't support addEventListener or attachEvent");        },        triggerEvent: function (element, eventType) {            if (!(element && element.nodeType))                throw new Error("element must be a DOM node when calling triggerEvent");            // For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the            // event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)            // IE doesn't change the checked state when you trigger the click event using "fireEvent".            // In both cases, we'll use the click method instead.            var useClickWorkaround = isClickOnCheckableElement(element, eventType);            if (jQueryInstance && !useClickWorkaround) {                jQueryInstance(element)['trigger'](eventType);            } else if (typeof document.createEvent == "function") {                if (typeof element.dispatchEvent == "function") {                    var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";                    var event = document.createEvent(eventCategory);                    event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);                    element.dispatchEvent(event);                }                else                    throw new Error("The supplied element doesn't support dispatchEvent");            } else if (useClickWorkaround && element.click) {                element.click();            } else if (typeof element.fireEvent != "undefined") {                element.fireEvent("on" + eventType);            } else {                throw new Error("Browser doesn't support triggering events");            }        },        unwrapObservable: function (value) {            return ko.isObservable(value) ? value() : value;        },        peekObservable: function (value) {            return ko.isObservable(value) ? value.peek() : value;        },        toggleDomNodeCssClass: toggleDomNodeCssClass,        setTextContent: function(element, textContent) {            var value = ko.utils.unwrapObservable(textContent);            if ((value === null) || (value === undefined))                value = "";            // We need there to be exactly one child: a text node.            // If there are no children, more than one, or if it's not a text node,            // we'll clear everything and create a single text node.            var innerTextNode = ko.virtualElements.firstChild(element);            if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {                ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);            } else {                innerTextNode.data = value;            }            ko.utils.forceRefresh(element);        },        setElementName: function(element, name) {            element.name = name;            // Workaround IE 6/7 issue            // - https://github.com/SteveSanderson/knockout/issues/197            // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/            if (ieVersion <= 7) {                try {                    element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);                }                catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"            }        },        forceRefresh: function(node) {            // Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209            if (ieVersion >= 9) {                // For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container                var elem = node.nodeType == 1 ? node : node.parentNode;                if (elem.style)                    elem.style.zoom = elem.style.zoom;            }        },        ensureSelectElementIsRenderedCorrectly: function(selectElement) {            // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.            // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)            // Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)            if (ieVersion) {                var originalWidth = selectElement.style.width;                selectElement.style.width = 0;                selectElement.style.width = originalWidth;            }        },        range: function (min, max) {            min = ko.utils.unwrapObservable(min);            max = ko.utils.unwrapObservable(max);            var result = [];            for (var i = min; i <= max; i++)                result.push(i);            return result;        },        makeArray: function(arrayLikeObject) {            var result = [];            for (var i = 0, j = arrayLikeObject.length; i < j; i++) {                result.push(arrayLikeObject[i]);            };            return result;        },        isIe6 : isIe6,        isIe7 : isIe7,        ieVersion : ieVersion,        getFormFields: function(form, fieldName) {            var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));            var isMatchingField = (typeof fieldName == 'string')                ? function(field) { return field.name === fieldName }                : function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate            var matches = [];            for (var i = fields.length - 1; i >= 0; i--) {                if (isMatchingField(fields[i]))                    matches.push(fields[i]);            };            return matches;        },        parseJson: function (jsonString) {            if (typeof jsonString == "string") {                jsonString = ko.utils.stringTrim(jsonString);                if (jsonString) {                    if (JSON && JSON.parse) // Use native parsing where available                        return JSON.parse(jsonString);                    return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers                }            }            return null;        },        stringifyJson: function (data, replacer, space) {   // replacer and space are optional            if (!JSON || !JSON.stringify)                throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");            return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);        },        postJson: function (urlOrForm, data, options) {            options = options || {};            var params = options['params'] || {};            var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;            var url = urlOrForm;            // If we were given a form, use its 'action' URL and pick out any requested field values            if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {                var originalForm = urlOrForm;                url = originalForm.action;                for (var i = includeFields.length - 1; i >= 0; i--) {                    var fields = ko.utils.getFormFields(originalForm, includeFields[i]);                    for (var j = fields.length - 1; j >= 0; j--)                        params[fields[j].name] = fields[j].value;                }            }            data = ko.utils.unwrapObservable(data);            var form = document.createElement("form");            form.style.display = "none";            form.action = url;            form.method = "post";            for (var key in data) {                // Since 'data' this is a model object, we include all properties including those inherited from its prototype                var input = document.createElement("input");                input.type = "hidden";                input.name = key;                input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));                form.appendChild(input);            }            objectForEach(params, function(key, value) {                var input = document.createElement("input");                input.type = "hidden";                input.name = key;                input.value = value;                form.appendChild(input);            });            document.body.appendChild(form);            options['submitter'] ? options['submitter'](form) : form.submit();            setTimeout(function () { form.parentNode.removeChild(form); }, 0);        }    }}());ko.exportSymbol('utils', ko.utils);ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);ko.exportSymbol('utils.extend', ko.utils.extend);ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);ko.exportSymbol('utils.postJson', ko.utils.postJson);ko.exportSymbol('utils.parseJson', ko.utils.parseJson);ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);ko.exportSymbol('utils.range', ko.utils.range);ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonlyif (!Function.prototype['bind']) {    // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)    // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js    Function.prototype['bind'] = function (object) {        var originalFunction = this;        if (arguments.length === 1) {            return function () {                return originalFunction.apply(object, arguments);            };        } else {            var partialArgs = Array.prototype.slice.call(arguments, 1);            return function () {                var args = partialArgs.slice(0);                args.push.apply(args, arguments);                return originalFunction.apply(object, args);            };        }    };}ko.utils.domData = new (function () {    var uniqueId = 0;    var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();    var dataStore = {};    function getAll(node, createIfNotFound) {        var dataStoreKey = node[dataStoreKeyExpandoPropertyName];        var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];        if (!hasExistingDataStore) {            if (!createIfNotFound)                return undefined;            dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;            dataStore[dataStoreKey] = {};        }        return dataStore[dataStoreKey];    }    return {        get: function (node, key) {            var allDataForNode = getAll(node, false);            return allDataForNode === undefined ? undefined : allDataForNode[key];        },        set: function (node, key, value) {            if (value === undefined) {                // Make sure we don't actually create a new domData key if we are actually deleting a value                if (getAll(node, false) === undefined)                    return;            }            var allDataForNode = getAll(node, true);            allDataForNode[key] = value;        },        clear: function (node) {            var dataStoreKey = node[dataStoreKeyExpandoPropertyName];            if (dataStoreKey) {                delete dataStore[dataStoreKey];                node[dataStoreKeyExpandoPropertyName] = null;                return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended            }            return false;        },        nextKey: function () {            return (uniqueId++) + dataStoreKeyExpandoPropertyName;        }    };})();ko.exportSymbol('utils.domData', ko.utils.domData);ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fullyko.utils.domNodeDisposal = new (function () {    var domDataKey = ko.utils.domData.nextKey();    var cleanableNodeTypes = { 1: true, 8: true, 9: true };       // Element, Comment, Document    var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document    function getDisposeCallbacksCollection(node, createIfNotFound) {        var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);        if ((allDisposeCallbacks === undefined) && createIfNotFound) {            allDisposeCallbacks = [];            ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);        }        return allDisposeCallbacks;    }    function destroyCallbacksCollection(node) {        ko.utils.domData.set(node, domDataKey, undefined);    }    function cleanSingleNode(node) {        // Run all the dispose callbacks        var callbacks = getDisposeCallbacksCollection(node, false);        if (callbacks) {            callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)            for (var i = 0; i < callbacks.length; i++)                callbacks[i](node);        }        // Erase the DOM data        ko.utils.domData.clear(node);        // Perform cleanup needed by external libraries (currently only jQuery, but can be extended)        ko.utils.domNodeDisposal["cleanExternalData"](node);        // Clear any immediate-child comment nodes, as these wouldn't have been found by        // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)        if (cleanableNodeTypesWithDescendants[node.nodeType])            cleanImmediateCommentTypeChildren(node);    }    function cleanImmediateCommentTypeChildren(nodeWithChildren) {        var child, nextChild = nodeWithChildren.firstChild;        while (child = nextChild) {            nextChild = child.nextSibling;            if (child.nodeType === 8)                cleanSingleNode(child);        }    }    return {        addDisposeCallback : function(node, callback) {            if (typeof callback != "function")                throw new Error("Callback must be a function");            getDisposeCallbacksCollection(node, true).push(callback);        },        removeDisposeCallback : function(node, callback) {            var callbacksCollection = getDisposeCallbacksCollection(node, false);            if (callbacksCollection) {                ko.utils.arrayRemoveItem(callbacksCollection, callback);                if (callbacksCollection.length == 0)                    destroyCallbacksCollection(node);            }        },        cleanNode : function(node) {            // First clean this node, where applicable            if (cleanableNodeTypes[node.nodeType]) {                cleanSingleNode(node);                // ... then its descendants, where applicable                if (cleanableNodeTypesWithDescendants[node.nodeType]) {                    // Clone the descendants list in case it changes during iteration                    var descendants = [];                    ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));                    for (var i = 0, j = descendants.length; i < j; i++)                        cleanSingleNode(descendants[i]);                }            }            return node;        },        removeNode : function(node) {            ko.cleanNode(node);            if (node.parentNode)                node.parentNode.removeChild(node);        },        "cleanExternalData" : function (node) {            // Special support for jQuery here because it's so commonly used.            // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData            // so notify it to tear down any resources associated with the node & descendants here.            if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))                jQueryInstance['cleanData']([node]);        }    };})();ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenienceko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenienceko.exportSymbol('cleanNode', ko.cleanNode);ko.exportSymbol('removeNode', ko.removeNode);ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);(function () {    var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;    function simpleHtmlParse(html, documentContext) {        documentContext || (documentContext = document);        var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;        // Based on jQuery's "clean" function, but only accounting for table-related elements.        // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly        // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of        // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"        // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node        // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.        // Trim whitespace, otherwise indexOf won't work as expected        var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div");        // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column        var wrap = tags.match(/^<(thead|tbody|tfoot)/)              && [1, "<table>", "</table>"] ||                   !tags.indexOf("<tr")                             && [2, "<table><tbody>", "</tbody></table>"] ||                   (!tags.indexOf("<td") || !tags.indexOf("<th"))   && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||                   /* anything else */                                 [0, "", ""];        // Go to html and back, then peel off extra wrappers        // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.        var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";        if (typeof windowContext['innerShiv'] == "function") {            div.appendChild(windowContext['innerShiv'](markup));        } else {            div.innerHTML = markup;        }        // Move to the right depth        while (wrap[0]--)            div = div.lastChild;        return ko.utils.makeArray(div.lastChild.childNodes);    }    function jQueryHtmlParse(html, documentContext) {        // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.        if (jQueryInstance['parseHTML']) {            return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null        } else {            // For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.            var elems = jQueryInstance['clean']([html], documentContext);            // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.            // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.            // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.            if (elems && elems[0]) {                // Find the top-most parent element that's a direct child of a document fragment                var elem = elems[0];                while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)                    elem = elem.parentNode;                // ... then detach it                if (elem.parentNode)                    elem.parentNode.removeChild(elem);            }            return elems;        }    }    ko.utils.parseHtmlFragment = function(html, documentContext) {        return jQueryInstance ? jQueryHtmlParse(html, documentContext)   // As below, benefit from jQuery's optimisations where possible                              : simpleHtmlParse(html, documentContext);  // ... otherwise, this simple logic will do in most common cases.    };    ko.utils.setHtml = function(node, html) {        ko.utils.emptyDomNode(node);        // There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it        html = ko.utils.unwrapObservable(html);        if ((html !== null) && (html !== undefined)) {            if (typeof html != 'string')                html = html.toString();            // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,            // for example <tr> elements which are not normally allowed to exist on their own.            // If you've referenced jQuery we'll use that rather than duplicating its code.            if (jQueryInstance) {                jQueryInstance(node)['html'](html);            } else {                // ... otherwise, use KO's own parsing logic.                var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);                for (var i = 0; i < parsedNodes.length; i++)                    node.appendChild(parsedNodes[i]);            }        }    };})();ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);ko.exportSymbol('utils.setHtml', ko.utils.setHtml);ko.memoization = (function () {    var memos = {};    function randomMax8HexChars() {        return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);    }    function generateRandomId() {        return randomMax8HexChars() + randomMax8HexChars();    }    function findMemoNodes(rootNode, appendToArray) {        if (!rootNode)            return;        if (rootNode.nodeType == 8) {            var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);            if (memoId != null)                appendToArray.push({ domNode: rootNode, memoId: memoId });        } else if (rootNode.nodeType == 1) {            for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)                findMemoNodes(childNodes[i], appendToArray);        }    }    return {        memoize: function (callback) {            if (typeof callback != "function")                throw new Error("You can only pass a function to ko.memoization.memoize()");            var memoId = generateRandomId();            memos[memoId] = callback;            return "<!--[ko_memo:" + memoId + "]-->";        },        unmemoize: function (memoId, callbackParams) {            var callback = memos[memoId];            if (callback === undefined)                throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");            try {                callback.apply(null, callbackParams || []);                return true;            }            finally { delete memos[memoId]; }        },        unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {            var memos = [];            findMemoNodes(domNode, memos);            for (var i = 0, j = memos.length; i < j; i++) {                var node = memos[i].domNode;                var combinedParams = [node];                if (extraCallbackParamsArray)                    ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);                ko.memoization.unmemoize(memos[i].memoId, combinedParams);                node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again                if (node.parentNode)                    node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)            }        },        parseMemoText: function (memoText) {            var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);            return match ? match[1] : null;        }    };})();ko.exportSymbol('memoization', ko.memoization);ko.exportSymbol('memoization.memoize', ko.memoization.memoize);ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);ko.extenders = {    'throttle': function(target, timeout) {        // Throttling means two things:        // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies        //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate        target['throttleEvaluation'] = timeout;        // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*        //     so the target cannot change value synchronously or faster than a certain rate        var writeTimeoutInstance = null;        return ko.dependentObservable({            'read': target,            'write': function(value) {                clearTimeout(writeTimeoutInstance);                writeTimeoutInstance = setTimeout(function() {                    target(value);                }, timeout);            }        });    },    'rateLimit': function(target, options) {        var timeout, method, limitFunction;        if (typeof options == 'number') {            timeout = options;        } else {            timeout = options['timeout'];            method = options['method'];        }        limitFunction = method == 'notifyWhenChangesStop' ?  debounce : throttle;        target.limit(function(callback) {            return limitFunction(callback, timeout);        });    },    'notify': function(target, notifyWhen) {        target["equalityComparer"] = notifyWhen == "always" ?            null :  // null equalityComparer means to always notify            valuesArePrimitiveAndEqual;    }};var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };function valuesArePrimitiveAndEqual(a, b) {    var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);    return oldValueIsPrimitive ? (a === b) : false;}function throttle(callback, timeout) {    var timeoutInstance;    return function () {        if (!timeoutInstance) {            timeoutInstance = setTimeout(function() {                timeoutInstance = undefined;                callback();            }, timeout);        }    };}function debounce(callback, timeout) {    var timeoutInstance;    return function () {        clearTimeout(timeoutInstance);        timeoutInstance = setTimeout(callback, timeout);    };}function applyExtenders(requestedExtenders) {    var target = this;    if (requestedExtenders) {        ko.utils.objectForEach(requestedExtenders, function(key, value) {            var extenderHandler = ko.extenders[key];            if (typeof extenderHandler == 'function') {                target = extenderHandler(target, value) || target;            }        });    }    return target;}ko.exportSymbol('extenders', ko.extenders);ko.subscription = function (target, callback, disposeCallback) {    this._target = target;    this.callback = callback;    this.disposeCallback = disposeCallback;    this.isDisposed = false;    ko.exportProperty(this, 'dispose', this.dispose);};ko.subscription.prototype.dispose = function () {    this.isDisposed = true;    this.disposeCallback();};ko.subscribable = function () {    ko.utils.setPrototypeOfOrExtend(this, ko.subscribable['fn']);    this._subscriptions = {};    this._versionNumber = 1;}var defaultEvent = "change";var ko_subscribable_fn = {    subscribe: function (callback, callbackTarget, event) {        var self = this;        event = event || defaultEvent;        var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;        var subscription = new ko.subscription(self, boundCallback, function () {            ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);            if (self.afterSubscriptionRemove)                self.afterSubscriptionRemove(event);        });        if (self.beforeSubscriptionAdd)            self.beforeSubscriptionAdd(event);        if (!self._subscriptions[event])            self._subscriptions[event] = [];        self._subscriptions[event].push(subscription);        return subscription;    },    "notifySubscribers": function (valueToNotify, event) {        event = event || defaultEvent;        if (event === defaultEvent) {            this.updateVersion();        }        if (this.hasSubscriptionsForEvent(event)) {            try {                ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)                for (var a = this._subscriptions[event].slice(0), i = 0, subscription; subscription = a[i]; ++i) {                    // In case a subscription was disposed during the arrayForEach cycle, check                    // for isDisposed on each subscription before invoking its callback                    if (!subscription.isDisposed)                        subscription.callback(valueToNotify);                }            } finally {                ko.dependencyDetection.end(); // End suppressing dependency detection            }        }    },    getVersion: function () {        return this._versionNumber;    },    hasChanged: function (versionToCheck) {        return this.getVersion() !== versionToCheck;    },    updateVersion: function () {        ++this._versionNumber;    },    limit: function(limitFunction) {        var self = this, selfIsObservable = ko.isObservable(self),            isPending, previousValue, pendingValue, beforeChange = 'beforeChange';        if (!self._origNotifySubscribers) {            self._origNotifySubscribers = self["notifySubscribers"];            self["notifySubscribers"] = function(value, event) {                if (!event || event === defaultEvent) {                    self._rateLimitedChange(value);                } else if (event === beforeChange) {                    self._rateLimitedBeforeChange(value);                } else {                    self._origNotifySubscribers(value, event);                }            };        }        var finish = limitFunction(function() {            // If an observable provided a reference to itself, access it to get the latest value.            // This allows computed observables to delay calculating their value until needed.            if (selfIsObservable && pendingValue === self) {                pendingValue = self();            }            isPending = false;            if (self.isDifferent(previousValue, pendingValue)) {                self._origNotifySubscribers(previousValue = pendingValue);            }        });        self._rateLimitedChange = function(value) {            isPending = true;            pendingValue = value;            finish();        };        self._rateLimitedBeforeChange = function(value) {            if (!isPending) {                previousValue = value;                self._origNotifySubscribers(value, beforeChange);            }        };    },    hasSubscriptionsForEvent: function(event) {        return this._subscriptions[event] && this._subscriptions[event].length;    },    getSubscriptionsCount: function (event) {        if (event) {            return this._subscriptions[event] && this._subscriptions[event].length || 0;        } else {            var total = 0;            ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {                total += subscriptions.length;            });            return total;        }    },    isDifferent: function(oldValue, newValue) {        return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);    },    extend: applyExtenders};ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);// For browsers that support proto assignment, we overwrite the prototype of each// observable instance. Since observables are functions, we need Function.prototype// to still be in the prototype chain.if (ko.utils.canSetPrototype) {    ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);}ko.subscribable['fn'] = ko_subscribable_fn;ko.isSubscribable = function (instance) {    return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";};ko.exportSymbol('subscribable', ko.subscribable);ko.exportSymbol('isSubscribable', ko.isSubscribable);ko.computedContext = ko.dependencyDetection = (function () {    var outerFrames = [],        currentFrame,        lastId = 0;    // Return a unique ID that can be assigned to an observable for dependency tracking.    // Theoretically, you could eventually overflow the number storage size, resulting    // in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53    // or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would    // take over 285 years to reach that number.    // Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html    function getId() {        return ++lastId;    }    function begin(options) {        outerFrames.push(currentFrame);        currentFrame = options;    }    function end() {        currentFrame = outerFrames.pop();    }    return {        begin: begin,        end: end,        registerDependency: function (subscribable) {            if (currentFrame) {                if (!ko.isSubscribable(subscribable))                    throw new Error("Only subscribable things can act as dependencies");                currentFrame.callback(subscribable, subscribable._id || (subscribable._id = getId()));            }        },        ignore: function (callback, callbackTarget, callbackArgs) {            try {                begin();                return callback.apply(callbackTarget, callbackArgs || []);            } finally {                end();            }        },        getDependenciesCount: function () {            if (currentFrame)                return currentFrame.computed.getDependenciesCount();        },        isInitial: function() {            if (currentFrame)                return currentFrame.isInitial;        }    };})();ko.exportSymbol('computedContext', ko.computedContext);ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);ko.exportSymbol('computedContext.isSleeping', ko.computedContext.isSleeping);ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);ko.observable = function (initialValue) {    var _latestValue = initialValue;    function observable() {        if (arguments.length > 0) {            // Write            // Ignore writes if the value hasn't changed            if (observable.isDifferent(_latestValue, arguments[0])) {                observable.valueWillMutate();                _latestValue = arguments[0];                if (DEBUG) observable._latestValue = _latestValue;                observable.valueHasMutated();            }            return this; // Permits chained assignments        }        else {            // Read            ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation            return _latestValue;        }    }    ko.subscribable.call(observable);    ko.utils.setPrototypeOfOrExtend(observable, ko.observable['fn']);    if (DEBUG) observable._latestValue = _latestValue;    observable.peek = function() { return _latestValue };    observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }    observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }    ko.exportProperty(observable, 'peek', observable.peek);    ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);    ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);    return observable;}ko.observable['fn'] = {    "equalityComparer": valuesArePrimitiveAndEqual};var protoProperty = ko.observable.protoProperty = "__ko_proto__";ko.observable['fn'][protoProperty] = ko.observable;// Note that for browsers that don't support proto assignment, the// inheritance chain is created manually in the ko.observable constructorif (ko.utils.canSetPrototype) {    ko.utils.setPrototypeOf(ko.observable['fn'], ko.subscribable['fn']);}ko.hasPrototype = function(instance, prototype) {    if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;    if (instance[protoProperty] === prototype) return true;    return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain};ko.isObservable = function (instance) {    return ko.hasPrototype(instance, ko.observable);}ko.isWriteableObservable = function (instance) {    // Observable    if ((typeof instance == "function") && instance[protoProperty] === ko.observable)        return true;    // Writeable dependent observable    if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))        return true;    // Anything else    return false;}ko.exportSymbol('observable', ko.observable);ko.exportSymbol('isObservable', ko.isObservable);ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);ko.observableArray = function (initialValues) {    initialValues = initialValues || [];    if (typeof initialValues != 'object' || !('length' in initialValues))        throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");    var result = ko.observable(initialValues);    ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);    return result.extend({'trackArrayChanges':true});};ko.observableArray['fn'] = {    'remove': function (valueOrPredicate) {        var underlyingArray = this.peek();        var removedValues = [];        var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };        for (var i = 0; i < underlyingArray.length; i++) {            var value = underlyingArray[i];            if (predicate(value)) {                if (removedValues.length === 0) {                    this.valueWillMutate();                }                removedValues.push(value);                underlyingArray.splice(i, 1);                i--;            }        }        if (removedValues.length) {            this.valueHasMutated();        }        return removedValues;    },    'removeAll': function (arrayOfValues) {        // If you passed zero args, we remove everything        if (arrayOfValues === undefined) {            var underlyingArray = this.peek();            var allValues = underlyingArray.slice(0);            this.valueWillMutate();            underlyingArray.splice(0, underlyingArray.length);            this.valueHasMutated();            return allValues;        }        // If you passed an arg, we interpret it as an array of entries to remove        if (!arrayOfValues)            return [];        return this['remove'](function (value) {            return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;        });    },    'destroy': function (valueOrPredicate) {        var underlyingArray = this.peek();        var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };        this.valueWillMutate();        for (var i = underlyingArray.length - 1; i >= 0; i--) {            var value = underlyingArray[i];            if (predicate(value))                underlyingArray[i]["_destroy"] = true;        }        this.valueHasMutated();    },    'destroyAll': function (arrayOfValues) {        // If you passed zero args, we destroy everything        if (arrayOfValues === undefined)            return this['destroy'](function() { return true });        // If you passed an arg, we interpret it as an array of entries to destroy        if (!arrayOfValues)            return [];        return this['destroy'](function (value) {            return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;        });    },    'indexOf': function (item) {        var underlyingArray = this();        return ko.utils.arrayIndexOf(underlyingArray, item);    },    'replace': function(oldItem, newItem) {        var index = this['indexOf'](oldItem);        if (index >= 0) {            this.valueWillMutate();            this.peek()[index] = newItem;            this.valueHasMutated();        }    }};// Populate ko.observableArray.fn with read/write functions from native arrays// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array// because we'll eval them without causing subscriptions, so ko.computed output could end up getting staleko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {    ko.observableArray['fn'][methodName] = function () {        // Use "peek" to avoid creating a subscription in any computed that we're executing in the context of        // (for consistency with mutating regular observables)        var underlyingArray = this.peek();        this.valueWillMutate();        this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);        var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);        this.valueHasMutated();        return methodCallResult;    };});// Populate ko.observableArray.fn with read-only functions from native arraysko.utils.arrayForEach(["slice"], function (methodName) {    ko.observableArray['fn'][methodName] = function () {        var underlyingArray = this();        return underlyingArray[methodName].apply(underlyingArray, arguments);    };});// Note that for browsers that don't support proto assignment, the// inheritance chain is created manually in the ko.observableArray constructorif (ko.utils.canSetPrototype) {    ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);}ko.exportSymbol('observableArray', ko.observableArray);var arrayChangeEventName = 'arrayChange';ko.extenders['trackArrayChanges'] = function(target) {    // Only modify the target observable once    if (target.cacheDiffForKnownOperation) {        return;    }    var trackingChanges = false,        cachedDiff = null,        arrayChangeSubscription,        pendingNotifications = 0,        underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,        underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;    // Watch "subscribe" calls, and for array change events, ensure change tracking is enabled    target.beforeSubscriptionAdd = function (event) {        if (underlyingBeforeSubscriptionAddFunction)            underlyingBeforeSubscriptionAddFunction.call(target, event);        if (event === arrayChangeEventName) {            trackChanges();        }    };    // Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed    target.afterSubscriptionRemove = function (event) {        if (underlyingAfterSubscriptionRemoveFunction)            underlyingAfterSubscriptionRemoveFunction.call(target, event);        if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {            arrayChangeSubscription.dispose();            trackingChanges = false;        }    };    function trackChanges() {        // Calling 'trackChanges' multiple times is the same as calling it once        if (trackingChanges) {            return;        }        trackingChanges = true;        // Intercept "notifySubscribers" to track how many times it was called.        var underlyingNotifySubscribersFunction = target['notifySubscribers'];        target['notifySubscribers'] = function(valueToNotify, event) {            if (!event || event === defaultEvent) {                ++pendingNotifications;            }            return underlyingNotifySubscribersFunction.apply(this, arguments);        };        // Each time the array changes value, capture a clone so that on the next        // change it's possible to produce a diff        var previousContents = [].concat(target.peek() || []);        cachedDiff = null;        arrayChangeSubscription = target.subscribe(function(currentContents) {            // Make a copy of the current contents and ensure it's an array            currentContents = [].concat(currentContents || []);            // Compute the diff and issue notifications, but only if someone is listening            if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {                var changes = getChanges(previousContents, currentContents);            }            // Eliminate references to the old, removed items, so they can be GCed            previousContents = currentContents;            cachedDiff = null;            pendingNotifications = 0;            if (changes && changes.length) {                target['notifySubscribers'](changes, arrayChangeEventName);            }        });    }    function getChanges(previousContents, currentContents) {        // We try to re-use cached diffs.        // The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates        // plugin, which without this check would not be compatible with arrayChange notifications. Normally,        // notifications are issued immediately so we wouldn't be queueing up more than one.        if (!cachedDiff || pendingNotifications > 1) {            cachedDiff = ko.utils.compareArrays(previousContents, currentContents, { 'sparse': true });        }        return cachedDiff;    }    target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {        // Only run if we're currently tracking changes for this observable array        // and there aren't any pending deferred notifications.        if (!trackingChanges || pendingNotifications) {            return;        }        var diff = [],            arrayLength = rawArray.length,            argsLength = args.length,            offset = 0;        function pushDiff(status, value, index) {            return diff[diff.length] = { 'status': status, 'value': value, 'index': index };        }        switch (operationName) {            case 'push':                offset = arrayLength;            case 'unshift':                for (var index = 0; index < argsLength; index++) {                    pushDiff('added', args[index], offset + index);                }                break;            case 'pop':                offset = arrayLength - 1;            case 'shift':                if (arrayLength) {                    pushDiff('deleted', rawArray[offset], offset);                }                break;            case 'splice':                // Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].                // See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice                var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),                    endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),                    endAddIndex = startIndex + argsLength - 2,                    endIndex = Math.max(endDeleteIndex, endAddIndex),                    additions = [], deletions = [];                for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {                    if (index < endDeleteIndex)                        deletions.push(pushDiff('deleted', rawArray[index], index));                    if (index < endAddIndex)                        additions.push(pushDiff('added', args[argsIndex], index));                }                ko.utils.findMovesInArrayComparison(deletions, additions);                break;            default:                return;        }        cachedDiff = diff;    };};ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {    var _latestValue,        _needsEvaluation = true,        _isBeingEvaluated = false,        _suppressDisposalUntilDisposeWhenReturnsFalse = false,        _isDisposed = false,        readFunction = evaluatorFunctionOrOptions,        pure = false,        isSleeping = false;    if (readFunction && typeof readFunction == "object") {        // Single-parameter syntax - everything is on this "options" param        options = readFunction;        readFunction = options["read"];    } else {        // Multi-parameter syntax - construct the options according to the params passed        options = options || {};        if (!readFunction)            readFunction = options["read"];    }    if (typeof readFunction != "function")        throw new Error("Pass a function that returns the value of the ko.computed");    function addDependencyTracking(id, target, trackingObj) {        if (pure && target === dependentObservable) {            throw Error("A 'pure' computed must not be called recursively");        }        dependencyTracking[id] = trackingObj;        trackingObj._order = _dependenciesCount++;        trackingObj._version = target.getVersion();    }    function haveDependenciesChanged() {        var id, dependency;        for (id in dependencyTracking) {            if (dependencyTracking.hasOwnProperty(id)) {                dependency = dependencyTracking[id];                if (dependency._target.hasChanged(dependency._version)) {                    return true;                }            }        }    }    function disposeComputed() {        if (!isSleeping && dependencyTracking) {            ko.utils.objectForEach(dependencyTracking, function (id, dependency) {                if (dependency.dispose)                    dependency.dispose();            });        }        dependencyTracking = null;        _dependenciesCount = 0;        _isDisposed = true;        _needsEvaluation = false;        isSleeping = false;    }    function evaluatePossiblyAsync() {        var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];        if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {            clearTimeout(evaluationTimeoutInstance);            evaluationTimeoutInstance = setTimeout(function () {                evaluateImmediate(true /*notifyChange*/);            }, throttleEvaluationTimeout);        } else if (dependentObservable._evalRateLimited) {            dependentObservable._evalRateLimited();        } else {            evaluateImmediate(true /*notifyChange*/);        }    }    function evaluateImmediate(notifyChange) {        if (_isBeingEvaluated) {            // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.            // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost            // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing            // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387            return;        }        // Do not evaluate (and possibly capture new dependencies) if disposed        if (_isDisposed) {            return;        }        if (disposeWhen && disposeWhen()) {            // See comment below about _suppressDisposalUntilDisposeWhenReturnsFalse            if (!_suppressDisposalUntilDisposeWhenReturnsFalse) {                dispose();                return;            }        } else {            // It just did return false, so we can stop suppressing now            _suppressDisposalUntilDisposeWhenReturnsFalse = false;        }        _isBeingEvaluated = true;        try {            // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).            // Then, during evaluation, we cross off any that are in fact still being used.            var disposalCandidates = dependencyTracking,                disposalCount = _dependenciesCount,                isInitial = pure ? undefined : !_dependenciesCount;   // If we're evaluating when there are no previous dependencies, it must be the first time            ko.dependencyDetection.begin({                callback: function(subscribable, id) {                    if (!_isDisposed) {                        if (disposalCount && disposalCandidates[id]) {                            // Don't want to dispose this subscription, as it's still being used                            addDependencyTracking(id, subscribable, disposalCandidates[id]);                            delete disposalCandidates[id];                            --disposalCount;                        } else if (!dependencyTracking[id]) {                            // Brand new subscription - add it                            addDependencyTracking(id, subscribable, isSleeping ? { _target: subscribable } : subscribable.subscribe(evaluatePossiblyAsync));                        }                    }                },                computed: dependentObservable,                isInitial: isInitial            });            dependencyTracking = {};            _dependenciesCount = 0;            try {                var newValue = evaluatorFunctionTarget ? readFunction.call(evaluatorFunctionTarget) : readFunction();            } finally {                ko.dependencyDetection.end();                // For each subscription no longer being used, remove it from the active subscriptions list and dispose it                if (disposalCount && !isSleeping) {                    ko.utils.objectForEach(disposalCandidates, function(id, toDispose) {                        if (toDispose.dispose)                            toDispose.dispose();                    });                }                _needsEvaluation = false;            }            if (dependentObservable.isDifferent(_latestValue, newValue)) {                if (!isSleeping) {                    notify(_latestValue, "beforeChange");                }                _latestValue = newValue;                if (DEBUG) dependentObservable._latestValue = _latestValue;                if (isSleeping) {                    dependentObservable.updateVersion();                } else if (notifyChange) {                    notify(_latestValue);                }            }            if (isInitial) {                notify(_latestValue, "awake");            }        } finally {            _isBeingEvaluated = false;        }        if (!_dependenciesCount)            dispose();    }    function dependentObservable() {        if (arguments.length > 0) {            if (typeof writeFunction === "function") {                // Writing a value                writeFunction.apply(evaluatorFunctionTarget, arguments);            } else {                throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");            }            return this; // Permits chained assignments        } else {            // Reading the value            ko.dependencyDetection.registerDependency(dependentObservable);            if (_needsEvaluation || (isSleeping && haveDependenciesChanged())) {                evaluateImmediate();            }            return _latestValue;        }    }    function peek() {        // Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.        if ((_needsEvaluation && !_dependenciesCount) || (isSleeping && haveDependenciesChanged())) {            evaluateImmediate();        }        return _latestValue;    }    function isActive() {        return _needsEvaluation || _dependenciesCount > 0;    }    function notify(value, event) {        dependentObservable["notifySubscribers"](value, event);    }    // By here, "options" is always non-null    var writeFunction = options["write"],        disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,        disposeWhenOption = options["disposeWhen"] || options.disposeWhen,        disposeWhen = disposeWhenOption,        dispose = disposeComputed,        dependencyTracking = {},        _dependenciesCount = 0,        evaluationTimeoutInstance = null;    if (!evaluatorFunctionTarget)        evaluatorFunctionTarget = options["owner"];    ko.subscribable.call(dependentObservable);    ko.utils.setPrototypeOfOrExtend(dependentObservable, ko.dependentObservable['fn']);    dependentObservable.peek = peek;    dependentObservable.getDependenciesCount = function () { return _dependenciesCount; };    dependentObservable.hasWriteFunction = typeof writeFunction === "function";    dependentObservable.dispose = function () { dispose(); };    dependentObservable.isActive = isActive;    // Replace the limit function with one that delays evaluation as well.    var originalLimit = dependentObservable.limit;    dependentObservable.limit = function(limitFunction) {        originalLimit.call(dependentObservable, limitFunction);        dependentObservable._evalRateLimited = function() {            dependentObservable._rateLimitedBeforeChange(_latestValue);            _needsEvaluation = true;    // Mark as dirty            // Pass the observable to the rate-limit code, which will access it when            // it's time to do the notification.            dependentObservable._rateLimitedChange(dependentObservable);        }    };    if (options['pure']) {        pure = true;        isSleeping = true;     // Starts off sleeping; will awake on the first subscription        dependentObservable.beforeSubscriptionAdd = function (event) {            // If asleep, wake up the computed by subscribing to any dependencies.            if (!_isDisposed && isSleeping && event == 'change') {                isSleeping = false;                if (_needsEvaluation || haveDependenciesChanged()) {                    dependencyTracking = null;                    _dependenciesCount = 0;                    _needsEvaluation = true;                    evaluateImmediate();                } else {                    // First put the dependencies in order                    var dependeciesOrder = [];                    ko.utils.objectForEach(dependencyTracking, function (id, dependency) {                        dependeciesOrder[dependency._order] = id;                    });                    // Next, subscribe to each one                    ko.utils.arrayForEach(dependeciesOrder, function(id, order) {                        var dependency = dependencyTracking[id],                            subscription = dependency._target.subscribe(evaluatePossiblyAsync);                        subscription._order = order;                        subscription._version = dependency._version;                        dependencyTracking[id] = subscription;                    });                }                if (!_isDisposed) {     // test since evaluating could trigger disposal                    notify(_latestValue, "awake");                }            }        };        dependentObservable.afterSubscriptionRemove = function (event) {            if (!_isDisposed && event == 'change' && !dependentObservable.hasSubscriptionsForEvent('change')) {                ko.utils.objectForEach(dependencyTracking, function (id, dependency) {                    if (dependency.dispose) {                        dependencyTracking[id] = {                            _target: dependency._target,                            _order: dependency._order,                            _version: dependency._version                        };                        dependency.dispose();                    }                });                isSleeping = true;                notify(undefined, "asleep");            }        };        // Because a pure computed is not automatically updated while it is sleeping, we can't        // simply return the version number. Instead, we check if any of the dependencies have        // changed and conditionally re-evaluate the computed observable.        dependentObservable._originalGetVersion = dependentObservable.getVersion;        dependentObservable.getVersion = function () {            if (isSleeping && (_needsEvaluation || haveDependenciesChanged())) {                evaluateImmediate();            }            return dependentObservable._originalGetVersion();        };    } else if (options['deferEvaluation']) {        // This will force a computed with deferEvaluation to evaluate when the first subscriptions is registered.        dependentObservable.beforeSubscriptionAdd = function (event) {            if (event == 'change' || event == 'beforeChange') {                peek();            }        }    }    ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);    ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);    ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);    ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);    // Add a "disposeWhen" callback that, on each evaluation, disposes if the node was removed without using ko.removeNode.    if (disposeWhenNodeIsRemoved) {        // Since this computed is associated with a DOM node, and we don't want to dispose the computed        // until the DOM node is *removed* from the document (as opposed to never having been in the document),        // we'll prevent disposal until "disposeWhen" first returns false.        _suppressDisposalUntilDisposeWhenReturnsFalse = true;        // Only watch for the node's disposal if the value really is a node. It might not be,        // e.g., { disposeWhenNodeIsRemoved: true } can be used to opt into the "only dispose        // after first false result" behaviour even if there's no specific node to watch. This        // technique is intended for KO's internal use only and shouldn't be documented or used        // by application code, as it's likely to change in a future version of KO.        if (disposeWhenNodeIsRemoved.nodeType) {            disposeWhen = function () {                return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || (disposeWhenOption && disposeWhenOption());            };        }    }    // Evaluate, unless sleeping or deferEvaluation is true    if (!isSleeping && !options['deferEvaluation'])        evaluateImmediate();    // Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is    // removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).    if (disposeWhenNodeIsRemoved && isActive() && disposeWhenNodeIsRemoved.nodeType) {        dispose = function() {            ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, dispose);            disposeComputed();        };        ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);    }    return dependentObservable;};ko.isComputed = function(instance) {    return ko.hasPrototype(instance, ko.dependentObservable);};var protoProp = ko.observable.protoProperty; // == "__ko_proto__"ko.dependentObservable[protoProp] = ko.observable;ko.dependentObservable['fn'] = {    "equalityComparer": valuesArePrimitiveAndEqual};ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;// Note that for browsers that don't support proto assignment, the// inheritance chain is created manually in the ko.dependentObservable constructorif (ko.utils.canSetPrototype) {    ko.utils.setPrototypeOf(ko.dependentObservable['fn'], ko.subscribable['fn']);}ko.exportSymbol('dependentObservable', ko.dependentObservable);ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"ko.exportSymbol('isComputed', ko.isComputed);ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {    if (typeof evaluatorFunctionOrOptions === 'function') {        return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});    } else {        evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions);   // make a copy of the parameter object        evaluatorFunctionOrOptions['pure'] = true;        return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);    }}ko.exportSymbol('pureComputed', ko.pureComputed);(function() {    var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)    ko.toJS = function(rootObject) {        if (arguments.length == 0)            throw new Error("When calling ko.toJS, pass the object you want to convert.");        // We just unwrap everything at every level in the object graph        return mapJsObjectGraph(rootObject, function(valueToMap) {            // Loop because an observable's value might in turn be another observable wrapper            for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)                valueToMap = valueToMap();            return valueToMap;        });    };    ko.toJSON = function(rootObject, replacer, space) {     // replacer and space are optional        var plainJavaScriptObject = ko.toJS(rootObject);        return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);    };    function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {        visitedObjects = visitedObjects || new objectLookup();        rootObject = mapInputCallback(rootObject);        var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));        if (!canHaveProperties)            return rootObject;        var outputProperties = rootObject instanceof Array ? [] : {};        visitedObjects.save(rootObject, outputProperties);        visitPropertiesOrArrayEntries(rootObject, function(indexer) {            var propertyValue = mapInputCallback(rootObject[indexer]);            switch (typeof propertyValue) {                case "boolean":                case "number":                case "string":                case "function":                    outputProperties[indexer] = propertyValue;                    break;                case "object":                case "undefined":                    var previouslyMappedValue = visitedObjects.get(propertyValue);                    outputProperties[indexer] = (previouslyMappedValue !== undefined)                        ? previouslyMappedValue                        : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);                    break;            }        });        return outputProperties;    }    function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {        if (rootObject instanceof Array) {            for (var i = 0; i < rootObject.length; i++)                visitorCallback(i);            // For arrays, also respect toJSON property for custom mappings (fixes #278)            if (typeof rootObject['toJSON'] == 'function')                visitorCallback('toJSON');        } else {            for (var propertyName in rootObject) {                visitorCallback(propertyName);            }        }    };    function objectLookup() {        this.keys = [];        this.values = [];    };    objectLookup.prototype = {        constructor: objectLookup,        save: function(key, value) {            var existingIndex = ko.utils.arrayIndexOf(this.keys, key);            if (existingIndex >= 0)                this.values[existingIndex] = value;            else {                this.keys.push(key);                this.values.push(value);            }        },        get: function(key) {            var existingIndex = ko.utils.arrayIndexOf(this.keys, key);            return (existingIndex >= 0) ? this.values[existingIndex] : undefined;        }    };})();ko.exportSymbol('toJS', ko.toJS);ko.exportSymbol('toJSON', ko.toJSON);(function () {    var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';    // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values    // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values    // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.    ko.selectExtensions = {        readValue : function(element) {            switch (ko.utils.tagNameLower(element)) {                case 'option':                    if (element[hasDomDataExpandoProperty] === true)                        return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);                    return ko.utils.ieVersion <= 7                        ? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)                        : element.value;                case 'select':                    return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;                default:                    return element.value;            }        },        writeValue: function(element, value, allowUnset) {            switch (ko.utils.tagNameLower(element)) {                case 'option':                    switch(typeof value) {                        case "string":                            ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);                            if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node                                delete element[hasDomDataExpandoProperty];                            }                            element.value = value;                            break;                        default:                            // Store arbitrary object using DomData                            ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);                            element[hasDomDataExpandoProperty] = true;                            // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.                            element.value = typeof value === "number" ? value : "";                            break;                    }                    break;                case 'select':                    if (value === "" || value === null)       // A blank string or null value will select the caption                        value = undefined;                    var selection = -1;                    for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {                        optionValue = ko.selectExtensions.readValue(element.options[i]);                        // Include special check to handle selecting a caption with a blank string value                        if (optionValue == value || (optionValue == "" && value === undefined)) {                            selection = i;                            break;                        }                    }                    if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {                        element.selectedIndex = selection;                    }                    break;                default:                    if ((value === null) || (value === undefined))                        value = "";                    element.value = value;                    break;            }        }    };})();ko.exportSymbol('selectExtensions', ko.selectExtensions);ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);ko.expressionRewriting = (function () {    var javaScriptReservedWords = ["true", "false", "null", "undefined"];    // Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor    // This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).    // This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).    var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;    function getWriteableValue(expression) {        if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)            return false;        var match = expression.match(javaScriptAssignmentTarget);        return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;    }    // The following regular expressions will be used to split an object-literal string into tokens        // These two match strings, either with double quotes or single quotes    var stringDouble = '"(?:[^"\\\\]|\\\\.)*"',        stringSingle = "'(?:[^'\\\\]|\\\\.)*'",        // Matches a regular expression (text enclosed by slashes), but will also match sets of divisions        // as a regular expression (this is handled by the parsing loop below).        stringRegexp = '/(?:[^/\\\\]|\\\\.)*/\w*',        // These characters have special meaning to the parser and must not appear in the middle of a        // token, except as part of a string.        specials = ',"\'{}()/:[\\]',        // Match text (at least two characters) that does not contain any of the above special characters,        // although some of the special characters are allowed to start it (all but the colon and comma).        // The text can contain spaces, but leading or trailing spaces are skipped.        everyThingElse = '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',        // Match any non-space character not matched already. This will match colons and commas, since they're        // not matched by "everyThingElse", but will also match any other single character that wasn't already        // matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).        oneNotSpace = '[^\\s]',        // Create the actual regular expression by or-ing the above strings. The order is important.        bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'),        // Match end of previous token to determine whether a slash is a division or regex.        divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,        keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};    function parseObjectLiteral(objectLiteralString) {        // Trim leading and trailing spaces from the string        var str = ko.utils.stringTrim(objectLiteralString);        // Trim braces '{' surrounding the whole object literal        if (str.charCodeAt(0) === 123) str = str.slice(1, -1);        // Split into tokens        var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;        if (toks) {            // Append a comma so that we don't need a separate code block to deal with the last item            toks.push(',');            for (var i = 0, tok; tok = toks[i]; ++i) {                var c = tok.charCodeAt(0);                // A comma signals the end of a key/value pair if depth is zero                if (c === 44) { // ","                    if (depth <= 0) {                        result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});                        key = depth = 0;                        values = [];                        continue;                    }                // Simply skip the colon that separates the name and value                } else if (c === 58) { // ":"                    if (!depth && !key && values.length === 1) {                        key = values.pop();                        continue;                    }                // A set of slashes is initially matched as a regular expression, but could be division                } else if (c === 47 && i && tok.length > 1) {  // "/"                    // Look at the end of the previous token to determine if the slash is actually division                    var match = toks[i-1].match(divisionLookBehind);                    if (match && !keywordRegexLookBehind[match[0]]) {                        // The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)                        str = str.substr(str.indexOf(tok) + 1);                        toks = str.match(bindingToken);                        toks.push(',');                        i = -1;                        // Continue with just the slash                        tok = '/';                    }                // Increment depth for parentheses, braces, and brackets so that interior commas are ignored                } else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['                    ++depth;                } else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'                    --depth;                // The key will be the first token; if it's a string, trim the quotes                } else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"                    tok = tok.slice(1, -1);                }                values.push(tok);            }        }        return result;    }    // Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.    var twoWayBindings = {};    function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {        bindingOptions = bindingOptions || {};        function processKeyValue(key, val) {            var writableVal;            function callPreprocessHook(obj) {                return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;            }            if (!bindingParams) {                if (!callPreprocessHook(ko['getBindingHandler'](key)))                    return;                if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {                    // For two-way bindings, provide a write method in case the value                    // isn't a writable observable.                    propertyAccessorResultStrings.push("'" + key + "':function(_z){" + writableVal + "=_z}");                }            }            // Values are wrapped in a function so that each value can be accessed independently            if (makeValueAccessors) {                val = 'function(){return ' + val + ' }';            }            resultStrings.push("'" + key + "':" + val);        }        var resultStrings = [],            propertyAccessorResultStrings = [],            makeValueAccessors = bindingOptions['valueAccessors'],            bindingParams = bindingOptions['bindingParams'],            keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?                parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;        ko.utils.arrayForEach(keyValueArray, function(keyValue) {            processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);        });        if (propertyAccessorResultStrings.length)            processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");        return resultStrings.join(",");    }    return {        bindingRewriteValidators: [],        twoWayBindings: twoWayBindings,        parseObjectLiteral: parseObjectLiteral,        preProcessBindings: preProcessBindings,        keyValueArrayContainsKey: function(keyValueArray, key) {            for (var i = 0; i < keyValueArray.length; i++)                if (keyValueArray[i]['key'] == key)                    return true;            return false;        },        // Internal, private KO utility for updating model properties from within bindings        // property:            If the property being updated is (or might be) an observable, pass it here        //                      If it turns out to be a writable observable, it will be written to directly        // allBindings:         An object with a get method to retrieve bindings in the current execution context.        //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable        // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'        // value:               The value to be written        // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if        //                      it is !== existing value on that writable observable        writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {            if (!property || !ko.isObservable(property)) {                var propWriters = allBindings.get('_ko_property_writers');                if (propWriters && propWriters[key])                    propWriters[key](value);            } else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {                property(value);            }        }    };})();ko.exportSymbol('expressionRewriting', ko.expressionRewriting);ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);// Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if// all bindings could use an official 'property writer' API without needing to declare that they might). However,// since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable// as an internal implementation detail in the short term.// For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an// undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official// public API, and we reserve the right to remove it at any time if we create a real public property writers API.ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);// For backward compatibility, define the following aliases. (Previously, these function names were misleading because// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);(function() {    // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes    // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).    // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state    // of that virtual hierarchy    //    // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)    // without having to scatter special cases all over the binding and templating code.    // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)    // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.    // So, use node.text where available, and node.nodeValue elsewhere    var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";    var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;    var endCommentRegex =   commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;    var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };    function isStartComment(node) {        return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);    }    function isEndComment(node) {        return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);    }    function getVirtualChildren(startComment, allowUnbalanced) {        var currentNode = startComment;        var depth = 1;        var children = [];        while (currentNode = currentNode.nextSibling) {            if (isEndComment(currentNode)) {                depth--;                if (depth === 0)                    return children;            }            children.push(currentNode);            if (isStartComment(currentNode))                depth++;        }        if (!allowUnbalanced)            throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);        return null;    }    function getMatchingEndComment(startComment, allowUnbalanced) {        var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);        if (allVirtualChildren) {            if (allVirtualChildren.length > 0)                return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;            return startComment.nextSibling;        } else            return null; // Must have no matching end comment, and allowUnbalanced is true    }    function getUnbalancedChildTags(node) {        // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>        //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->        var childNode = node.firstChild, captureRemaining = null;        if (childNode) {            do {                if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes                    captureRemaining.push(childNode);                else if (isStartComment(childNode)) {                    var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);                    if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set                        childNode = matchingEndComment;                    else                        captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point                } else if (isEndComment(childNode)) {                    captureRemaining = [childNode];     // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing                }            } while (childNode = childNode.nextSibling);        }        return captureRemaining;    }    ko.virtualElements = {        allowedBindings: {},        childNodes: function(node) {            return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;        },        emptyNode: function(node) {            if (!isStartComment(node))                ko.utils.emptyDomNode(node);            else {                var virtualChildren = ko.virtualElements.childNodes(node);                for (var i = 0, j = virtualChildren.length; i < j; i++)                    ko.removeNode(virtualChildren[i]);            }        },        setDomNodeChildren: function(node, childNodes) {            if (!isStartComment(node))                ko.utils.setDomNodeChildren(node, childNodes);            else {                ko.virtualElements.emptyNode(node);                var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children                for (var i = 0, j = childNodes.length; i < j; i++)                    endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);            }        },        prepend: function(containerNode, nodeToPrepend) {            if (!isStartComment(containerNode)) {                if (containerNode.firstChild)                    containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);                else                    containerNode.appendChild(nodeToPrepend);            } else {                // Start comments must always have a parent and at least one following sibling (the end comment)                containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);            }        },        insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {            if (!insertAfterNode) {                ko.virtualElements.prepend(containerNode, nodeToInsert);            } else if (!isStartComment(containerNode)) {                // Insert after insertion point                if (insertAfterNode.nextSibling)                    containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);                else                    containerNode.appendChild(nodeToInsert);            } else {                // Children of start comments must always have a parent and at least one following sibling (the end comment)                containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);            }        },        firstChild: function(node) {            if (!isStartComment(node))                return node.firstChild;            if (!node.nextSibling || isEndComment(node.nextSibling))                return null;            return node.nextSibling;        },        nextSibling: function(node) {            if (isStartComment(node))                node = getMatchingEndComment(node);            if (node.nextSibling && isEndComment(node.nextSibling))                return null;            return node.nextSibling;        },        hasBindingValue: isStartComment,        virtualNodeBindingValue: function(node) {            var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);            return regexMatch ? regexMatch[1] : null;        },        normaliseVirtualElementDomStructure: function(elementVerified) {            // Workaround for https://github.com/SteveSanderson/knockout/issues/155            // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes            // that are direct descendants of <ul> into the preceding <li>)            if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])                return;            // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags            // must be intended to appear *after* that child, so move them there.            var childNode = elementVerified.firstChild;            if (childNode) {                do {                    if (childNode.nodeType === 1) {                        var unbalancedTags = getUnbalancedChildTags(childNode);                        if (unbalancedTags) {                            // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child                            var nodeToInsertBefore = childNode.nextSibling;                            for (var i = 0; i < unbalancedTags.length; i++) {                                if (nodeToInsertBefore)                                    elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);                                else                                    elementVerified.appendChild(unbalancedTags[i]);                            }                        }                    }                } while (childNode = childNode.nextSibling);            }        }    };})();ko.exportSymbol('virtualElements', ko.virtualElements);ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minifiedko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minifiedko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);(function() {    var defaultBindingAttributeName = "data-bind";    ko.bindingProvider = function() {        this.bindingCache = {};    };    ko.utils.extend(ko.bindingProvider.prototype, {        'nodeHasBindings': function(node) {            switch (node.nodeType) {                case 1: // Element                    return node.getAttribute(defaultBindingAttributeName) != null                        || ko.components['getComponentNameForNode'](node);                case 8: // Comment node                    return ko.virtualElements.hasBindingValue(node);                default: return false;            }        },        'getBindings': function(node, bindingContext) {            var bindingsString = this['getBindingsString'](node, bindingContext),                parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;            return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);        },        'getBindingAccessors': function(node, bindingContext) {            var bindingsString = this['getBindingsString'](node, bindingContext),                parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;            return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);        },        // The following function is only used internally by this default provider.        // It's not part of the interface definition for a general binding provider.        'getBindingsString': function(node, bindingContext) {            switch (node.nodeType) {                case 1: return node.getAttribute(defaultBindingAttributeName);   // Element                case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node                default: return null;            }        },        // The following function is only used internally by this default provider.        // It's not part of the interface definition for a general binding provider.        'parseBindingsString': function(bindingsString, bindingContext, node, options) {            try {                var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);                return bindingFunction(bindingContext, node);            } catch (ex) {                ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;                throw ex;            }        }    });    ko.bindingProvider['instance'] = new ko.bindingProvider();    function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {        var cacheKey = bindingsString + (options && options['valueAccessors'] || '');        return cache[cacheKey]            || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));    }    function createBindingsStringEvaluator(bindingsString, options) {        // Build the source for a function that evaluates "expression"        // For each scope variable, add an extra level of "with" nesting        // Example result: with(sc1) { with(sc0) { return (expression) } }        var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),            functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";        return new Function("$context", "$element", functionBody);    }})();ko.exportSymbol('bindingProvider', ko.bindingProvider);(function () {    ko.bindingHandlers = {};    // The following element types will not be recursed into during binding. In the future, we    // may consider adding <template> to this list, because such elements' contents are always    // intended to be bound in a different context from where they appear in the document.    var bindingDoesNotRecurseIntoElementTypes = {        // Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,        // because it's unexpected and a potential XSS issue        'script': true,        'textarea': true    };    // Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers    ko['getBindingHandler'] = function(bindingKey) {        return ko.bindingHandlers[bindingKey];    };    // The ko.bindingContext constructor is only called directly to create the root context. For child    // contexts, use bindingContext.createChildContext or bindingContext.extend.    ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback) {        // The binding context object includes static properties for the current, parent, and root view models.        // If a view model is actually stored in an observable, the corresponding binding context object, and        // any child contexts, must be updated when the view model is changed.        function updateContext() {            // Most of the time, the context will directly get a view model object, but if a function is given,            // we call the function to retrieve the view model. If the function accesses any obsevables or returns            // an observable, the dependency is tracked, and those observables can later cause the binding            // context to be updated.            var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor,                dataItem = ko.utils.unwrapObservable(dataItemOrObservable);            if (parentContext) {                // When a "parent" context is given, register a dependency on the parent context. Thus whenever the                // parent context is updated, this context will also be updated.                if (parentContext._subscribable)                    parentContext._subscribable();                // Copy $root and any custom properties from the parent context                ko.utils.extend(self, parentContext);                // Because the above copy overwrites our own properties, we need to reset them.                // During the first execution, "subscribable" isn't set, so don't bother doing the update then.                if (subscribable) {                    self._subscribable = subscribable;                }            } else {                self['$parents'] = [];                self['$root'] = dataItem;                // Export 'ko' in the binding context so it will be available in bindings and templates                // even if 'ko' isn't exported as a global, such as when using an AMD loader.                // See https://github.com/SteveSanderson/knockout/issues/490                self['ko'] = ko;            }            self['$rawData'] = dataItemOrObservable;            self['$data'] = dataItem;            if (dataItemAlias)                self[dataItemAlias] = dataItem;            // The extendCallback function is provided when creating a child context or extending a context.            // It handles the specific actions needed to finish setting up the binding context. Actions in this            // function could also add dependencies to this binding context.            if (extendCallback)                extendCallback(self, parentContext, dataItem);            return self['$data'];        }        function disposeWhen() {            return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes);        }        var self = this,            isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor),            nodes,            subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true });        // At this point, the binding context has been initialized, and the "subscribable" computed observable is        // subscribed to any observables that were accessed in the process. If there is nothing to track, the        // computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in        // the context object.        if (subscribable.isActive()) {            self._subscribable = subscribable;            // Always notify because even if the model ($data) hasn't changed, other context properties might have changed            subscribable['equalityComparer'] = null;            // We need to be able to dispose of this computed observable when it's no longer needed. This would be            // easy if we had a single node to watch, but binding contexts can be used by many different nodes, and            // we cannot assume that those nodes have any relation to each other. So instead we track any node that            // the context is attached to, and dispose the computed when all of those nodes have been cleaned.            // Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates            nodes = [];            subscribable._addNode = function(node) {                nodes.push(node);                ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) {                    ko.utils.arrayRemoveItem(nodes, node);                    if (!nodes.length) {                        subscribable.dispose();                        self._subscribable = subscribable = undefined;                    }                });            };        }    }    // Extend the binding context hierarchy with a new view model object. If the parent context is watching    // any obsevables, the new child context will automatically get a dependency on the parent context.    // But this does not mean that the $data value of the child context will also get updated. If the child    // view model also depends on the parent view model, you must provide a function that returns the correct    // view model on each update.    ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback) {        return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) {            // Extend the context hierarchy by setting the appropriate pointers            self['$parentContext'] = parentContext;            self['$parent'] = parentContext['$data'];            self['$parents'] = (parentContext['$parents'] || []).slice(0);            self['$parents'].unshift(self['$parent']);            if (extendCallback)                extendCallback(self);        });    };    // Extend the binding context with new custom properties. This doesn't change the context hierarchy.    // Similarly to "child" contexts, provide a function here to make sure that the correct values are set    // when an observable view model is updated.    ko.bindingContext.prototype['extend'] = function(properties) {        // If the parent context references an observable view model, "_subscribable" will always be the        // latest view model object. If not, "_subscribable" isn't set, and we can use the static "$data" value.        return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) {            // This "child" context doesn't directly track a parent observable view model,            // so we need to manually set the $rawData value to match the parent.            self['$rawData'] = parentContext['$rawData'];            ko.utils.extend(self, typeof(properties) == "function" ? properties() : properties);        });    };    // Returns the valueAccesor function for a binding value    function makeValueAccessor(value) {        return function() {            return value;        };    }    // Returns the value of a valueAccessor function    function evaluateValueAccessor(valueAccessor) {        return valueAccessor();    }    // Given a function that returns bindings, create and return a new object that contains    // binding value-accessors functions. Each accessor function calls the original function    // so that it always gets the latest value and all dependencies are captured. This is used    // by ko.applyBindingsToNode and getBindingsAndMakeAccessors.    function makeAccessorsFromFunction(callback) {        return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {            return function() {                return callback()[key];            };        });    }    // Given a bindings function or object, create and return a new object that contains    // binding value-accessors functions. This is used by ko.applyBindingsToNode.    function makeBindingAccessors(bindings, context, node) {        if (typeof bindings === 'function') {            return makeAccessorsFromFunction(bindings.bind(null, context, node));        } else {            return ko.utils.objectMap(bindings, makeValueAccessor);        }    }    // This function is used if the binding provider doesn't include a getBindingAccessors function.    // It must be called with 'this' set to the provider instance.    function getBindingsAndMakeAccessors(node, context) {        return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));    }    function validateThatBindingIsAllowedForVirtualElements(bindingName) {        var validator = ko.virtualElements.allowedBindings[bindingName];        if (!validator)            throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")    }    function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {        var currentChild,            nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement),            provider = ko.bindingProvider['instance'],            preprocessNode = provider['preprocessNode'];        // Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's        // possible to insert new siblings after it, and/or replace the node with a different one. This can be used to        // implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that        // trigger insertion of <template> contents at that point in the document.        if (preprocessNode) {            while (currentChild = nextInQueue) {                nextInQueue = ko.virtualElements.nextSibling(currentChild);                preprocessNode.call(provider, currentChild);            }            // Reset nextInQueue for the next loop            nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);        }        while (currentChild = nextInQueue) {            // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position            nextInQueue = ko.virtualElements.nextSibling(currentChild);            applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement);        }    }    function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) {        var shouldBindDescendants = true;        // Perf optimisation: Apply bindings only if...        // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)        //     Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those        // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)        var isElement = (nodeVerified.nodeType === 1);        if (isElement) // Workaround IE <= 8 HTML parsing weirdness            ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);        var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement)             // Case (1)                               || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified);       // Case (2)        if (shouldApplyBindings)            shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants'];        if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {            // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,            //  * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,            //    hence bindingContextsMayDifferFromDomParentElement is false            //  * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may            //    skip over any number of intermediate virtual elements, any of which might define a custom binding context,            //    hence bindingContextsMayDifferFromDomParentElement is true            applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);        }    }    var boundElementDomDataKey = ko.utils.domData.nextKey();    function topologicalSortBindings(bindings) {        // Depth-first sort        var result = [],                // The list of key/handler pairs that we will return            bindingsConsidered = {},    // A temporary record of which bindings are already in 'result'            cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it        ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {            if (!bindingsConsidered[bindingKey]) {                var binding = ko['getBindingHandler'](bindingKey);                if (binding) {                    // First add dependencies (if any) of the current binding                    if (binding['after']) {                        cyclicDependencyStack.push(bindingKey);                        ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {                            if (bindings[bindingDependencyKey]) {                                if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {                                    throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));                                } else {                                    pushBinding(bindingDependencyKey);                                }                            }                        });                        cyclicDependencyStack.length--;                    }                    // Next add the current binding                    result.push({ key: bindingKey, handler: binding });                }                bindingsConsidered[bindingKey] = true;            }        });        return result;    }    function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) {        // Prevent multiple applyBindings calls for the same node, except when a binding value is specified        var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);        if (!sourceBindings) {            if (alreadyBound) {                throw Error("You cannot apply bindings multiple times to the same element.");            }            ko.utils.domData.set(node, boundElementDomDataKey, true);        }        // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because        // we can easily recover it just by scanning up the node's ancestors in the DOM        // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)        if (!alreadyBound && bindingContextMayDifferFromDomParentElement)            ko.storedBindingContextForNode(node, bindingContext);        // Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings        var bindings;        if (sourceBindings && typeof sourceBindings !== 'function') {            bindings = sourceBindings;        } else {            var provider = ko.bindingProvider['instance'],                getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;            // Get the binding from the provider within a computed observable so that we can update the bindings whenever            // the binding context is updated or if the binding provider accesses observables.            var bindingsUpdater = ko.dependentObservable(                function() {                    bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);                    // Register a dependency on the binding context to support obsevable view models.                    if (bindings && bindingContext._subscribable)                        bindingContext._subscribable();                    return bindings;                },                null, { disposeWhenNodeIsRemoved: node }            );            if (!bindings || !bindingsUpdater.isActive())                bindingsUpdater = null;        }        var bindingHandlerThatControlsDescendantBindings;        if (bindings) {            // Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding            // context update), just return the value accessor from the binding. Otherwise, return a function that always gets            // the latest binding value and registers a dependency on the binding updater.            var getValueAccessor = bindingsUpdater                ? function(bindingKey) {                    return function() {                        return evaluateValueAccessor(bindingsUpdater()[bindingKey]);                    };                } : function(bindingKey) {                    return bindings[bindingKey];                };            // Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated            function allBindings() {                return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);            }            // The following is the 3.x allBindings API            allBindings['get'] = function(key) {                return bindings[key] && evaluateValueAccessor(getValueAccessor(key));            };            allBindings['has'] = function(key) {                return key in bindings;            };            // First put the bindings into the right order            var orderedBindings = topologicalSortBindings(bindings);            // Go through the sorted bindings, calling init and update for each            ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {                // Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,                // so bindingKeyAndHandler.handler will always be nonnull.                var handlerInitFn = bindingKeyAndHandler.handler["init"],                    handlerUpdateFn = bindingKeyAndHandler.handler["update"],                    bindingKey = bindingKeyAndHandler.key;                if (node.nodeType === 8) {                    validateThatBindingIsAllowedForVirtualElements(bindingKey);                }                try {                    // Run init, ignoring any dependencies                    if (typeof handlerInitFn == "function") {                        ko.dependencyDetection.ignore(function() {                            var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);                            // If this binding handler claims to control descendant bindings, make a note of this                            if (initResult && initResult['controlsDescendantBindings']) {                                if (bindingHandlerThatControlsDescendantBindings !== undefined)                                    throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");                                bindingHandlerThatControlsDescendantBindings = bindingKey;                            }                        });                    }                    // Run update in its own computed wrapper                    if (typeof handlerUpdateFn == "function") {                        ko.dependentObservable(                            function() {                                handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);                            },                            null,                            { disposeWhenNodeIsRemoved: node }                        );                    }                } catch (ex) {                    ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;                    throw ex;                }            });        }        return {            'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined        };    };    var storedBindingContextDomDataKey = ko.utils.domData.nextKey();    ko.storedBindingContextForNode = function (node, bindingContext) {        if (arguments.length == 2) {            ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);            if (bindingContext._subscribable)                bindingContext._subscribable._addNode(node);        } else {            return ko.utils.domData.get(node, storedBindingContextDomDataKey);        }    }    function getBindingContext(viewModelOrBindingContext) {        return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)            ? viewModelOrBindingContext            : new ko.bindingContext(viewModelOrBindingContext);    }    ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {        if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness            ko.virtualElements.normaliseVirtualElementDomStructure(node);        return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true);    };    ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {        var context = getBindingContext(viewModelOrBindingContext);        return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);    };    ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {        if (rootNode.nodeType === 1 || rootNode.nodeType === 8)            applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);    };    ko.applyBindings = function (viewModelOrBindingContext, rootNode) {        // If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.        if (!jQueryInstance && window['jQuery']) {            jQueryInstance = window['jQuery'];        }        if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))            throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");        rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional        applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);    };    // Retrieving binding context from arbitrary nodes    ko.contextFor = function(node) {        // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)        switch (node.nodeType) {            case 1:            case 8:                var context = ko.storedBindingContextForNode(node);                if (context) return context;                if (node.parentNode) return ko.contextFor(node.parentNode);                break;        }        return undefined;    };    ko.dataFor = function(node) {        var context = ko.contextFor(node);        return context ? context['$data'] : undefined;    };    ko.exportSymbol('bindingHandlers', ko.bindingHandlers);    ko.exportSymbol('applyBindings', ko.applyBindings);    ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);    ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);    ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);    ko.exportSymbol('contextFor', ko.contextFor);    ko.exportSymbol('dataFor', ko.dataFor);})();(function(undefined) {    var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight        loadedDefinitionsCache = {};    // Tracks component loads that have already completed    ko.components = {        get: function(componentName, callback) {            var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);            if (cachedDefinition) {                // It's already loaded and cached. Reuse the same definition object.                // Note that for API consistency, even cache hits complete asynchronously by default.                // You can bypass this by putting synchronous:true on your component config.                if (cachedDefinition.isSynchronousComponent) {                    ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning                        callback(cachedDefinition.definition);                    });                } else {                    setTimeout(function() { callback(cachedDefinition.definition); }, 0);                }            } else {                // Join the loading process that is already underway, or start a new one.                loadComponentAndNotify(componentName, callback);            }        },        clearCachedDefinition: function(componentName) {            delete loadedDefinitionsCache[componentName];        },        _getFirstResultFromLoaders: getFirstResultFromLoaders    };    function getObjectOwnProperty(obj, propName) {        return obj.hasOwnProperty(propName) ? obj[propName] : undefined;    }    function loadComponentAndNotify(componentName, callback) {        var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),            completedAsync;        if (!subscribable) {            // It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.            subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();            subscribable.subscribe(callback);            beginLoadingComponent(componentName, function(definition, config) {                var isSynchronousComponent = !!(config && config['synchronous']);                loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };                delete loadingSubscribablesCache[componentName];                // For API consistency, all loads complete asynchronously. However we want to avoid                // adding an extra setTimeout if it's unnecessary (i.e., the completion is already                // async) since setTimeout(..., 0) still takes about 16ms or more on most browsers.                //                // You can bypass the 'always synchronous' feature by putting the synchronous:true                // flag on your component configuration when you register it.                if (completedAsync || isSynchronousComponent) {                    // Note that notifySubscribers ignores any dependencies read within the callback.                    // See comment in loaderRegistryBehaviors.js for reasoning                    subscribable['notifySubscribers'](definition);                } else {                    setTimeout(function() {                        subscribable['notifySubscribers'](definition);                    }, 0);                }            });            completedAsync = true;        } else {            subscribable.subscribe(callback);        }    }    function beginLoadingComponent(componentName, callback) {        getFirstResultFromLoaders('getConfig', [componentName], function(config) {            if (config) {                // We have a config, so now load its definition                getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {                    callback(definition, config);                });            } else {                // The component has no config - it's unknown to all the loaders.                // Note that this is not an error (e.g., a module loading error) - that would abort the                // process and this callback would not run. For this callback to run, all loaders must                // have confirmed they don't know about this component.                callback(null, null);            }        });    }    function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {        // On the first call in the stack, start with the full set of loaders        if (!candidateLoaders) {            candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array        }        // Try the next candidate        var currentCandidateLoader = candidateLoaders.shift();        if (currentCandidateLoader) {            var methodInstance = currentCandidateLoader[methodName];            if (methodInstance) {                var wasAborted = false,                    synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {                        if (wasAborted) {                            callback(null);                        } else if (result !== null) {                            // This candidate returned a value. Use it.                            callback(result);                        } else {                            // Try the next candidate                            getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);                        }                    }));                // Currently, loaders may not return anything synchronously. This leaves open the possibility                // that we'll extend the API to support synchronous return values in the future. It won't be                // a breaking change, because currently no loader is allowed to return anything except undefined.                if (synchronousReturnValue !== undefined) {                    wasAborted = true;                    // Method to suppress exceptions will remain undocumented. This is only to keep                    // KO's specs running tidily, since we can observe the loading got aborted without                    // having exceptions cluttering up the console too.                    if (!currentCandidateLoader['suppressLoaderExceptions']) {                        throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');                    }                }            } else {                // This candidate doesn't have the relevant handler. Synchronously move on to the next one.                getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);            }        } else {            // No candidates returned a value            callback(null);        }    }    // Reference the loaders via string name so it's possible for developers    // to replace the whole array by assigning to ko.components.loaders    ko.components['loaders'] = [];    ko.exportSymbol('components', ko.components);    ko.exportSymbol('components.get', ko.components.get);    ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);})();(function(undefined) {    // The default loader is responsible for two things:    // 1. Maintaining the default in-memory registry of component configuration objects    //    (i.e., the thing you're writing to when you call ko.components.register(someName, ...))    // 2. Answering requests for components by fetching configuration objects    //    from that default in-memory registry and resolving them into standard    //    component definition objects (of the form { createViewModel: ..., template: ... })    // Custom loaders may override either of these facilities, i.e.,    // 1. To supply configuration objects from some other source (e.g., conventions)    // 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.    var defaultConfigRegistry = {};    ko.components.register = function(componentName, config) {        if (!config) {            throw new Error('Invalid configuration for ' + componentName);        }        if (ko.components.isRegistered(componentName)) {            throw new Error('Component ' + componentName + ' is already registered');        }        defaultConfigRegistry[componentName] = config;    }    ko.components.isRegistered = function(componentName) {        return componentName in defaultConfigRegistry;    }    ko.components.unregister = function(componentName) {        delete defaultConfigRegistry[componentName];        ko.components.clearCachedDefinition(componentName);    }    ko.components.defaultLoader = {        'getConfig': function(componentName, callback) {            var result = defaultConfigRegistry.hasOwnProperty(componentName)                ? defaultConfigRegistry[componentName]                : null;            callback(result);        },        'loadComponent': function(componentName, config, callback) {            var errorCallback = makeErrorCallback(componentName);            possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {                resolveConfig(componentName, errorCallback, loadedConfig, callback);            });        },        'loadTemplate': function(componentName, templateConfig, callback) {            resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);        },        'loadViewModel': function(componentName, viewModelConfig, callback) {            resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);        }    };    var createViewModelKey = 'createViewModel';    // Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it    // into the standard component definition format:    //    { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.    // Since both template and viewModel may need to be resolved asynchronously, both tasks are performed    // in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,    // so this is implemented manually below.    function resolveConfig(componentName, errorCallback, config, callback) {        var result = {},            makeCallBackWhenZero = 2,            tryIssueCallback = function() {                if (--makeCallBackWhenZero === 0) {                    callback(result);                }            },            templateConfig = config['template'],            viewModelConfig = config['viewModel'];        if (templateConfig) {            possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {                ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {                    result['template'] = resolvedTemplate;                    tryIssueCallback();                });            });        } else {            tryIssueCallback();        }        if (viewModelConfig) {            possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {                ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {                    result[createViewModelKey] = resolvedViewModel;                    tryIssueCallback();                });            });        } else {            tryIssueCallback();        }    }    function resolveTemplate(errorCallback, templateConfig, callback) {        if (typeof templateConfig === 'string') {            // Markup - parse it            callback(ko.utils.parseHtmlFragment(templateConfig));        } else if (templateConfig instanceof Array) {            // Assume already an array of DOM nodes - pass through unchanged            callback(templateConfig);        } else if (isDocumentFragment(templateConfig)) {            // Document fragment - use its child nodes            callback(ko.utils.makeArray(templateConfig.childNodes));        } else if (templateConfig['element']) {            var element = templateConfig['element'];            if (isDomElement(element)) {                // Element instance - copy its child nodes                callback(cloneNodesFromTemplateSourceElement(element));            } else if (typeof element === 'string') {                // Element ID - find it, then copy its child nodes                var elemInstance = document.getElementById(element);                if (elemInstance) {                    callback(cloneNodesFromTemplateSourceElement(elemInstance));                } else {                    errorCallback('Cannot find element with ID ' + element);                }            } else {                errorCallback('Unknown element type: ' + element);            }        } else {            errorCallback('Unknown template value: ' + templateConfig);        }    }    function resolveViewModel(errorCallback, viewModelConfig, callback) {        if (typeof viewModelConfig === 'function') {            // Constructor - convert to standard factory function format            // By design, this does *not* supply componentInfo to the constructor, as the intent is that            // componentInfo contains non-viewmodel data (e.g., the component's element) that should only            // be used in factory functions, not viewmodel constructors.            callback(function (params /*, componentInfo */) {                return new viewModelConfig(params);            });        } else if (typeof viewModelConfig[createViewModelKey] === 'function') {            // Already a factory function - use it as-is            callback(viewModelConfig[createViewModelKey]);        } else if ('instance' in viewModelConfig) {            // Fixed object instance - promote to createViewModel format for API consistency            var fixedInstance = viewModelConfig['instance'];            callback(function (params, componentInfo) {                return fixedInstance;            });        } else if ('viewModel' in viewModelConfig) {            // Resolved AMD module whose value is of the form { viewModel: ... }            resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);        } else {            errorCallback('Unknown viewModel value: ' + viewModelConfig);        }    }    function cloneNodesFromTemplateSourceElement(elemInstance) {        switch (ko.utils.tagNameLower(elemInstance)) {            case 'script':                return ko.utils.parseHtmlFragment(elemInstance.text);            case 'textarea':                return ko.utils.parseHtmlFragment(elemInstance.value);            case 'template':                // For browsers with proper <template> element support (i.e., where the .content property                // gives a document fragment), use that document fragment.                if (isDocumentFragment(elemInstance.content)) {                    return ko.utils.cloneNodes(elemInstance.content.childNodes);                }        }        // Regular elements such as <div>, and <template> elements on old browsers that don't really        // understand <template> and just treat it as a regular container        return ko.utils.cloneNodes(elemInstance.childNodes);    }    function isDomElement(obj) {        if (window['HTMLElement']) {            return obj instanceof HTMLElement;        } else {            return obj && obj.tagName && obj.nodeType === 1;        }    }    function isDocumentFragment(obj) {        if (window['DocumentFragment']) {            return obj instanceof DocumentFragment;        } else {            return obj && obj.nodeType === 11;        }    }    function possiblyGetConfigFromAmd(errorCallback, config, callback) {        if (typeof config['require'] === 'string') {            // The config is the value of an AMD module            if (amdRequire || window['require']) {                (amdRequire || window['require'])([config['require']], callback);            } else {                errorCallback('Uses require, but no AMD loader is present');            }        } else {            callback(config);        }    }    function makeErrorCallback(componentName) {        return function (message) {            throw new Error('Component \'' + componentName + '\': ' + message);        };    }    ko.exportSymbol('components.register', ko.components.register);    ko.exportSymbol('components.isRegistered', ko.components.isRegistered);    ko.exportSymbol('components.unregister', ko.components.unregister);    // Expose the default loader so that developers can directly ask it for configuration    // or to resolve configuration    ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);    // By default, the default loader is the only registered component loader    ko.components['loaders'].push(ko.components.defaultLoader);    // Privately expose the underlying config registry for use in old-IE shim    ko.components._allRegisteredComponents = defaultConfigRegistry;})();(function (undefined) {    // Overridable API for determining which component name applies to a given node. By overriding this,    // you can for example map specific tagNames to components that are not preregistered.    ko.components['getComponentNameForNode'] = function(node) {        var tagNameLower = ko.utils.tagNameLower(node);        return ko.components.isRegistered(tagNameLower) && tagNameLower;    };    ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {        // Determine if it's really a custom element matching a component        if (node.nodeType === 1) {            var componentName = ko.components['getComponentNameForNode'](node);            if (componentName) {                // It does represent a component, so add a component binding for it                allBindings = allBindings || {};                if (allBindings['component']) {                    // Avoid silently overwriting some other 'component' binding that may already be on the element                    throw new Error('Cannot use the "component" binding on a custom element matching a component');                }                var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };                allBindings['component'] = valueAccessors                    ? function() { return componentBindingValue; }                    : componentBindingValue;            }        }        return allBindings;    }    var nativeBindingProviderInstance = new ko.bindingProvider();    function getComponentParamsFromCustomElement(elem, bindingContext) {        var paramsAttribute = elem.getAttribute('params');        if (paramsAttribute) {            var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),                rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {                    return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });                }),                result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {                    var paramValue = paramValueComputed.peek();                    // Does the evaluation of the parameter value unwrap any observables?                    if (!paramValueComputed.isActive()) {                        // No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.                        // Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)                        return paramValue;                    } else {                        // Yes it does. Supply a computed property that unwraps both the outer (binding expression)                        // level of observability, and any inner (resulting model value) level of observability.                        // This means the component doesn't have to worry about multiple unwrapping. If the value is a                        // writable observable, the computed will also be writable and pass the value on to the observable.                        return ko.computed({                            'read': function() {                                return ko.utils.unwrapObservable(paramValueComputed());                            },                            'write': ko.isWriteableObservable(paramValue) && function(value) {                                paramValueComputed()(value);                            },                            disposeWhenNodeIsRemoved: elem                        });                    }                });            // Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'            // This is in case the developer wants to react to outer (binding) observability separately from inner            // (model value) observability, or in case the model value observable has subobservables.            if (!result.hasOwnProperty('$raw')) {                result['$raw'] = rawParamComputedValues;            }            return result;        } else {            // For consistency, absence of a "params" attribute is treated the same as the presence of            // any empty one. Otherwise component viewmodels need special code to check whether or not            // 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.            return { '$raw': {} };        }    }    // --------------------------------------------------------------------------------    // Compatibility code for older (pre-HTML5) IE browsers    if (ko.utils.ieVersion < 9) {        // Whenever you preregister a component, enable it as a custom element in the current document        ko.components['register'] = (function(originalFunction) {            return function(componentName) {                document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element                return originalFunction.apply(this, arguments);            }        })(ko.components['register']);        // Whenever you create a document fragment, enable all preregistered component names as custom elements        // This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements        document.createDocumentFragment = (function(originalFunction) {            return function() {                var newDocFrag = originalFunction(),                    allComponents = ko.components._allRegisteredComponents;                for (var componentName in allComponents) {                    if (allComponents.hasOwnProperty(componentName)) {                        newDocFrag.createElement(componentName);                    }                }                return newDocFrag;            };        })(document.createDocumentFragment);    }})();(function(undefined) {    var componentLoadingOperationUniqueId = 0;    ko.bindingHandlers['component'] = {        'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {            var currentViewModel,                currentLoadingOperationId,                disposeAssociatedComponentViewModel = function () {                    var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];                    if (typeof currentViewModelDispose === 'function') {                        currentViewModelDispose.call(currentViewModel);                    }                    // Any in-flight loading operation is no longer relevant, so make sure we ignore its completion                    currentLoadingOperationId = null;                },                originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));            ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);            ko.computed(function () {                var value = ko.utils.unwrapObservable(valueAccessor()),                    componentName, componentParams;                if (typeof value === 'string') {                    componentName = value;                } else {                    componentName = ko.utils.unwrapObservable(value['name']);                    componentParams = ko.utils.unwrapObservable(value['params']);                }                if (!componentName) {                    throw new Error('No component name specified');                }                var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;                ko.components.get(componentName, function(componentDefinition) {                    // If this is not the current load operation for this element, ignore it.                    if (currentLoadingOperationId !== loadingOperationId) {                        return;                    }                    // Clean up previous state                    disposeAssociatedComponentViewModel();                    // Instantiate and bind new component. Implicitly this cleans any old DOM nodes.                    if (!componentDefinition) {                        throw new Error('Unknown component \'' + componentName + '\'');                    }                    cloneTemplateIntoElement(componentName, componentDefinition, element);                    var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams),                        childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) {                            ctx['$component'] = componentViewModel;                            ctx['$componentTemplateNodes'] = originalChildNodes;                        });                    currentViewModel = componentViewModel;                    ko.applyBindingsToDescendants(childBindingContext, element);                });            }, null, { disposeWhenNodeIsRemoved: element });            return { 'controlsDescendantBindings': true };        }    };    ko.virtualElements.allowedBindings['component'] = true;    function cloneTemplateIntoElement(componentName, componentDefinition, element) {        var template = componentDefinition['template'];        if (!template) {            throw new Error('Component \'' + componentName + '\' has no template');        }        var clonedNodesArray = ko.utils.cloneNodes(template);        ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);    }    function createViewModel(componentDefinition, element, originalChildNodes, componentParams) {        var componentViewModelFactory = componentDefinition['createViewModel'];        return componentViewModelFactory            ? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes })            : componentParams; // Template-only component    }})();var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };ko.bindingHandlers['attr'] = {    'update': function(element, valueAccessor, allBindings) {        var value = ko.utils.unwrapObservable(valueAccessor()) || {};        ko.utils.objectForEach(value, function(attrName, attrValue) {            attrValue = ko.utils.unwrapObservable(attrValue);            // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely            // when someProp is a "no value"-like value (strictly null, false, or undefined)            // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)            var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);            if (toRemove)                element.removeAttribute(attrName);            // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the            // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,            // but instead of figuring out the mode, we'll just set the attribute through the Javascript            // property for IE <= 8.            if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {                attrName = attrHtmlToJavascriptMap[attrName];                if (toRemove)                    element.removeAttribute(attrName);                else                    element[attrName] = attrValue;            } else if (!toRemove) {                element.setAttribute(attrName, attrValue.toString());            }            // Treat "name" specially - although you can think of it as an attribute, it also needs            // special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)            // Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing            // entirely, and there's no strong reason to allow for such casing in HTML.            if (attrName === "name") {                ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());            }        });    }};(function() {ko.bindingHandlers['checked'] = {    'after': ['value', 'attr'],    'init': function (element, valueAccessor, allBindings) {        var checkedValue = ko.pureComputed(function() {            // Treat "value" like "checkedValue" when it is included with "checked" binding            if (allBindings['has']('checkedValue')) {                return ko.utils.unwrapObservable(allBindings.get('checkedValue'));            } else if (allBindings['has']('value')) {                return ko.utils.unwrapObservable(allBindings.get('value'));            }            return element.value;        });        function updateModel() {            // This updates the model value from the view value.            // It runs in response to DOM events (click) and changes in checkedValue.            var isChecked = element.checked,                elemValue = useCheckedValue ? checkedValue() : isChecked;            // When we're first setting up this computed, don't change any model state.            if (ko.computedContext.isInitial()) {                return;            }            // We can ignore unchecked radio buttons, because some other radio            // button will be getting checked, and that one can take care of updating state.            if (isRadio && !isChecked) {                return;            }            var modelValue = ko.dependencyDetection.ignore(valueAccessor);            if (isValueArray) {                if (oldElemValue !== elemValue) {                    // When we're responding to the checkedValue changing, and the element is                    // currently checked, replace the old elem value with the new elem value                    // in the model array.                    if (isChecked) {                        ko.utils.addOrRemoveItem(modelValue, elemValue, true);                        ko.utils.addOrRemoveItem(modelValue, oldElemValue, false);                    }                    oldElemValue = elemValue;                } else {                    // When we're responding to the user having checked/unchecked a checkbox,                    // add/remove the element value to the model array.                    ko.utils.addOrRemoveItem(modelValue, elemValue, isChecked);                }            } else {                ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);            }        };        function updateView() {            // This updates the view value from the model value.            // It runs in response to changes in the bound (checked) value.            var modelValue = ko.utils.unwrapObservable(valueAccessor());            if (isValueArray) {                // When a checkbox is bound to an array, being checked represents its value being present in that array                element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;            } else if (isCheckbox) {                // When a checkbox is bound to any other value (not an array), being checked represents the value being trueish                element.checked = modelValue;            } else {                // For radio buttons, being checked means that the radio button's value corresponds to the model value                element.checked = (checkedValue() === modelValue);            }        };        var isCheckbox = element.type == "checkbox",            isRadio = element.type == "radio";        // Only bind to check boxes and radio buttons        if (!isCheckbox && !isRadio) {            return;        }        var isValueArray = isCheckbox && (ko.utils.unwrapObservable(valueAccessor()) instanceof Array),            oldElemValue = isValueArray ? checkedValue() : undefined,            useCheckedValue = isRadio || isValueArray;        // IE 6 won't allow radio buttons to be selected unless they have a name        if (isRadio && !element.name)            ko.bindingHandlers['uniqueName']['init'](element, function() { return true });        // Set up two computeds to update the binding:        // The first responds to changes in the checkedValue value and to element clicks        ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });        ko.utils.registerEventHandler(element, "click", updateModel);        // The second responds to changes in the model value (the one associated with the checked binding)        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });    }};ko.expressionRewriting.twoWayBindings['checked'] = true;ko.bindingHandlers['checkedValue'] = {    'update': function (element, valueAccessor) {        element.value = ko.utils.unwrapObservable(valueAccessor());    }};})();var classesWrittenByBindingKey = '__ko__cssValue';ko.bindingHandlers['css'] = {    'update': function (element, valueAccessor) {        var value = ko.utils.unwrapObservable(valueAccessor());        if (value !== null && typeof value == "object") {            ko.utils.objectForEach(value, function(className, shouldHaveClass) {                shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);                ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);            });        } else {            value = String(value || ''); // Make sure we don't try to store or set a non-string value            ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);            element[classesWrittenByBindingKey] = value;            ko.utils.toggleDomNodeCssClass(element, value, true);        }    }};ko.bindingHandlers['enable'] = {    'update': function (element, valueAccessor) {        var value = ko.utils.unwrapObservable(valueAccessor());        if (value && element.disabled)            element.removeAttribute("disabled");        else if ((!value) && (!element.disabled))            element.disabled = true;    }};ko.bindingHandlers['disable'] = {    'update': function (element, valueAccessor) {        ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });    }};// For certain common events (currently just 'click'), allow a simplified data-binding syntax// e.g. click:handler instead of the usual full-length event:{click:handler}function makeEventHandlerShortcut(eventName) {    ko.bindingHandlers[eventName] = {        'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {            var newValueAccessor = function () {                var result = {};                result[eventName] = valueAccessor();                return result;            };            return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);        }    }}ko.bindingHandlers['event'] = {    'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {        var eventsToHandle = valueAccessor() || {};        ko.utils.objectForEach(eventsToHandle, function(eventName) {            if (typeof eventName == "string") {                ko.utils.registerEventHandler(element, eventName, function (event) {                    var handlerReturnValue;                    var handlerFunction = valueAccessor()[eventName];                    if (!handlerFunction)                        return;                    try {                        // Take all the event args, and prefix with the viewmodel                        var argsForHandler = ko.utils.makeArray(arguments);                        viewModel = bindingContext['$data'];                        argsForHandler.unshift(viewModel);                        handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);                    } finally {                        if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.                            if (event.preventDefault)                                event.preventDefault();                            else                                event.returnValue = false;                        }                    }                    var bubble = allBindings.get(eventName + 'Bubble') !== false;                    if (!bubble) {                        event.cancelBubble = true;                        if (event.stopPropagation)                            event.stopPropagation();                    }                });            }        });    }};// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"ko.bindingHandlers['foreach'] = {    makeTemplateValueAccessor: function(valueAccessor) {        return function() {            var modelValue = valueAccessor(),                unwrappedValue = ko.utils.peekObservable(modelValue);    // Unwrap without setting a dependency here            // If unwrappedValue is the array, pass in the wrapped value on its own            // The value will be unwrapped and tracked within the template binding            // (See https://github.com/SteveSanderson/knockout/issues/523)            if ((!unwrappedValue) || typeof unwrappedValue.length == "number")                return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };            // If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates            ko.utils.unwrapObservable(modelValue);            return {                'foreach': unwrappedValue['data'],                'as': unwrappedValue['as'],                'includeDestroyed': unwrappedValue['includeDestroyed'],                'afterAdd': unwrappedValue['afterAdd'],                'beforeRemove': unwrappedValue['beforeRemove'],                'afterRender': unwrappedValue['afterRender'],                'beforeMove': unwrappedValue['beforeMove'],                'afterMove': unwrappedValue['afterMove'],                'templateEngine': ko.nativeTemplateEngine.instance            };        };    },    'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {        return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));    },    'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {        return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);    }};ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindingsko.virtualElements.allowedBindings['foreach'] = true;var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';var hasfocusLastValue = '__ko_hasfocusLastValue';ko.bindingHandlers['hasfocus'] = {    'init': function(element, valueAccessor, allBindings) {        var handleElementFocusChange = function(isFocused) {            // Where possible, ignore which event was raised and determine focus state using activeElement,            // as this avoids phantom focus/blur events raised when changing tabs in modern browsers.            // However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,            // prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus            // from calling 'blur()' on the element when it loses focus.            // Discussion at https://github.com/SteveSanderson/knockout/pull/352            element[hasfocusUpdatingProperty] = true;            var ownerDoc = element.ownerDocument;            if ("activeElement" in ownerDoc) {                var active;                try {                    active = ownerDoc.activeElement;                } catch(e) {                    // IE9 throws if you access activeElement during page load (see issue #703)                    active = ownerDoc.body;                }                isFocused = (active === element);            }            var modelValue = valueAccessor();            ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);            //cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function            element[hasfocusLastValue] = isFocused;            element[hasfocusUpdatingProperty] = false;        };        var handleElementFocusIn = handleElementFocusChange.bind(null, true);        var handleElementFocusOut = handleElementFocusChange.bind(null, false);        ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);        ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE        ko.utils.registerEventHandler(element, "blur",  handleElementFocusOut);        ko.utils.registerEventHandler(element, "focusout",  handleElementFocusOut); // For IE    },    'update': function(element, valueAccessor) {        var value = !!ko.utils.unwrapObservable(valueAccessor()); //force boolean to compare with last value        if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {            value ? element.focus() : element.blur();            ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously        }    }};ko.expressionRewriting.twoWayBindings['hasfocus'] = true;ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an aliasko.expressionRewriting.twoWayBindings['hasFocus'] = true;ko.bindingHandlers['html'] = {    'init': function() {        // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)        return { 'controlsDescendantBindings': true };    },    'update': function (element, valueAccessor) {        // setHtml will unwrap the value if needed        ko.utils.setHtml(element, valueAccessor());    }};// Makes a binding like with or iffunction makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {    ko.bindingHandlers[bindingKey] = {        'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {            var didDisplayOnLastUpdate,                savedNodes;            ko.computed(function() {                var dataValue = ko.utils.unwrapObservable(valueAccessor()),                    shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue                    isFirstRender = !savedNodes,                    needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate);                if (needsRefresh) {                    // Save a copy of the inner nodes on the initial update, but only if we have dependencies.                    if (isFirstRender && ko.computedContext.getDependenciesCount()) {                        savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);                    }                    if (shouldDisplay) {                        if (!isFirstRender) {                            ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));                        }                        ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);                    } else {                        ko.virtualElements.emptyNode(element);                    }                    didDisplayOnLastUpdate = shouldDisplay;                }            }, null, { disposeWhenNodeIsRemoved: element });            return { 'controlsDescendantBindings': true };        }    };    ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings    ko.virtualElements.allowedBindings[bindingKey] = true;}// Construct the actual binding handlersmakeWithIfBinding('if');makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);makeWithIfBinding('with', true /* isWith */, false /* isNot */,    function(bindingContext, dataValue) {        return bindingContext['createChildContext'](dataValue);    });var captionPlaceholder = {};ko.bindingHandlers['options'] = {    'init': function(element) {        if (ko.utils.tagNameLower(element) !== "select")            throw new Error("options binding applies only to SELECT elements");        // Remove all existing <option>s.        while (element.length > 0) {            element.remove(0);        }        // Ensures that the binding processor doesn't try to bind the options        return { 'controlsDescendantBindings': true };    },    'update': function (element, valueAccessor, allBindings) {        function selectedOptions() {            return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });        }        var selectWasPreviouslyEmpty = element.length == 0,            multiple = element.multiple,            previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,            unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),            valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),            includeDestroyed = allBindings.get('optionsIncludeDestroyed'),            arrayToDomNodeChildrenOptions = {},            captionValue,            filteredArray,            previousSelectedValues = [];        if (!valueAllowUnset) {            if (multiple) {                previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);            } else if (element.selectedIndex >= 0) {                previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));            }        }        if (unwrappedArray) {            if (typeof unwrappedArray.length == "undefined") // Coerce single value into array                unwrappedArray = [unwrappedArray];            // Filter out any entries marked as destroyed            filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {                return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);            });            // If caption is included, add it to the array            if (allBindings['has']('optionsCaption')) {                captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));                // If caption value is null or undefined, don't show a caption                if (captionValue !== null && captionValue !== undefined) {                    filteredArray.unshift(captionPlaceholder);                }            }        } else {            // If a falsy value is provided (e.g. null), we'll simply empty the select element        }        function applyToObject(object, predicate, defaultValue) {            var predicateType = typeof predicate;            if (predicateType == "function")    // Given a function; run it against the data value                return predicate(object);            else if (predicateType == "string") // Given a string; treat it as a property name on the data value                return object[predicate];            else                                // Given no optionsText arg; use the data value itself                return defaultValue;        }        // The following functions can run at two different times:        // The first is when the whole array is being updated directly from this binding handler.        // The second is when an observable value for a specific array entry is updated.        // oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.        var itemUpdate = false;        function optionForArrayItem(arrayEntry, index, oldOptions) {            if (oldOptions.length) {                previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];                itemUpdate = true;            }            var option = element.ownerDocument.createElement("option");            if (arrayEntry === captionPlaceholder) {                ko.utils.setTextContent(option, allBindings.get('optionsCaption'));                ko.selectExtensions.writeValue(option, undefined);            } else {                // Apply a value to the option element                var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);                ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));                // Apply some text to the option element                var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);                ko.utils.setTextContent(option, optionText);            }            return [option];        }        // By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection        // problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208        arrayToDomNodeChildrenOptions['beforeRemove'] =            function (option) {                element.removeChild(option);            };        function setSelectionCallback(arrayEntry, newOptions) {            if (itemUpdate && valueAllowUnset) {                // The model value is authoritative, so make sure its value is the one selected                // There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already.                ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);            } else if (previousSelectedValues.length) {                // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.                // That's why we first added them without selection. Now it's time to set the selection.                var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;                ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);                // If this option was changed from being selected during a single-item update, notify the change                if (itemUpdate && !isSelected) {                    ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);                }            }        }        var callback = setSelectionCallback;        if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {            callback = function(arrayEntry, newOptions) {                setSelectionCallback(arrayEntry, newOptions);                ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);            }        }        ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);        ko.dependencyDetection.ignore(function () {            if (valueAllowUnset) {                // The model value is authoritative, so make sure its value is the one selected                ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);            } else {                // Determine if the selection has changed as a result of updating the options list                var selectionChanged;                if (multiple) {                    // For a multiple-select box, compare the new selection count to the previous one                    // But if nothing was selected before, the selection can't have changed                    selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;                } else {                    // For a single-select box, compare the current value to the previous value                    // But if nothing was selected before or nothing is selected now, just look for a change in selection                    selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)                        ? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])                        : (previousSelectedValues.length || element.selectedIndex >= 0);                }                // Ensure consistency between model value and selected option.                // If the dropdown was changed so that selection is no longer the same,                // notify the value or selectedOptions binding.                if (selectionChanged) {                    ko.utils.triggerEvent(element, "change");                }            }        });        // Workaround for IE bug        ko.utils.ensureSelectElementIsRenderedCorrectly(element);        if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)            element.scrollTop = previousScrollTop;    }};ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();ko.bindingHandlers['selectedOptions'] = {    'after': ['options', 'foreach'],    'init': function (element, valueAccessor, allBindings) {        ko.utils.registerEventHandler(element, "change", function () {            var value = valueAccessor(), valueToWrite = [];            ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {                if (node.selected)                    valueToWrite.push(ko.selectExtensions.readValue(node));            });            ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);        });    },    'update': function (element, valueAccessor) {        if (ko.utils.tagNameLower(element) != "select")            throw new Error("values binding applies only to SELECT elements");        var newValue = ko.utils.unwrapObservable(valueAccessor());        if (newValue && typeof newValue.length == "number") {            ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {                var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;                ko.utils.setOptionNodeSelectionState(node, isSelected);            });        }    }};ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;ko.bindingHandlers['style'] = {    'update': function (element, valueAccessor) {        var value = ko.utils.unwrapObservable(valueAccessor() || {});        ko.utils.objectForEach(value, function(styleName, styleValue) {            styleValue = ko.utils.unwrapObservable(styleValue);            if (styleValue === null || styleValue === undefined || styleValue === false) {                // Empty string removes the value, whereas null/undefined have no effect                styleValue = "";            }            element.style[styleName] = styleValue;        });    }};ko.bindingHandlers['submit'] = {    'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {        if (typeof valueAccessor() != "function")            throw new Error("The value for a submit binding must be a function");        ko.utils.registerEventHandler(element, "submit", function (event) {            var handlerReturnValue;            var value = valueAccessor();            try { handlerReturnValue = value.call(bindingContext['$data'], element); }            finally {                if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.                    if (event.preventDefault)                        event.preventDefault();                    else                        event.returnValue = false;                }            }        });    }};ko.bindingHandlers['text'] = {    'init': function() {        // Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).        // It should also make things faster, as we no longer have to consider whether the text node might be bindable.        return { 'controlsDescendantBindings': true };    },    'update': function (element, valueAccessor) {        ko.utils.setTextContent(element, valueAccessor());    }};ko.virtualElements.allowedBindings['text'] = true;(function () {if (window && window.navigator) {    var parseVersion = function (matches) {        if (matches) {            return parseFloat(matches[1]);        }    };    // Detect various browser versions because some old versions don't fully support the 'input' event    var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()),        userAgent = window.navigator.userAgent,        safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\/([^ ]*) safari/i)),        firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]*)/));}// IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.// But it does fire the 'selectionchange' event on many of those, presumably because the// cursor is moving and that counts as the selection changing. The 'selectionchange' event is// fired at the document level only and doesn't directly indicate which element changed. We// set up just one event handler for the document and use 'activeElement' to determine which// element was changed.if (ko.utils.ieVersion < 10) {    var selectionChangeRegisteredName = ko.utils.domData.nextKey(),        selectionChangeHandlerName = ko.utils.domData.nextKey();    var selectionChangeHandler = function(event) {        var target = this.activeElement,            handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);        if (handler) {            handler(event);        }    };    var registerForSelectionChangeEvent = function (element, handler) {        var ownerDoc = element.ownerDocument;        if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {            ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);            ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);        }        ko.utils.domData.set(element, selectionChangeHandlerName, handler);    };}ko.bindingHandlers['textInput'] = {    'init': function (element, valueAccessor, allBindings) {        var previousElementValue = element.value,            timeoutHandle,            elementValueBeforeEvent;        var updateModel = function (event) {            clearTimeout(timeoutHandle);            elementValueBeforeEvent = timeoutHandle = undefined;            var elementValue = element.value;            if (previousElementValue !== elementValue) {                // Provide a way for tests to know exactly which event was processed                if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;                previousElementValue = elementValue;                ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);            }        };        var deferUpdateModel = function (event) {            if (!timeoutHandle) {                // The elementValueBeforeEvent variable is set *only* during the brief gap between an                // event firing and the updateModel function running. This allows us to ignore model                // updates that are from the previous state of the element, usually due to techniques                // such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.                elementValueBeforeEvent = element.value;                var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;                timeoutHandle = setTimeout(handler, 4);            }        };        var updateView = function () {            var modelValue = ko.utils.unwrapObservable(valueAccessor());            if (modelValue === null || modelValue === undefined) {                modelValue = '';            }            if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {                setTimeout(updateView, 4);                return;            }            // Update the element only if the element and model are different. On some browsers, updating the value            // will move the cursor to the end of the input, which would be bad while the user is typing.            if (element.value !== modelValue) {                previousElementValue = modelValue;  // Make sure we ignore events (propertychange) that result from updating the value                element.value = modelValue;            }        };        var onEvent = function (event, handler) {            ko.utils.registerEventHandler(element, event, handler);        };        if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {            // Provide a way for tests to specify exactly which events are bound            ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {                if (eventName.slice(0,5) == 'after') {                    onEvent(eventName.slice(5), deferUpdateModel);                } else {                    onEvent(eventName, updateModel);                }            });        } else {            if (ko.utils.ieVersion < 10) {                // Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever                // any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,                // but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it                // when using autocomplete, we'll use 'propertychange' for it also.                onEvent('propertychange', function(event) {                    if (event.propertyName === 'value') {                        updateModel(event);                    }                });                if (ko.utils.ieVersion == 8) {                    // IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from                    // JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following                    // events too.                    onEvent('keyup', updateModel);      // A single keystoke                    onEvent('keydown', updateModel);    // The first character when a key is held down                }                if (ko.utils.ieVersion >= 8) {                    // Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using                    // the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text                    // out of the field, and cutting or deleting text using the context menu. 'selectionchange'                    // can detect all of those except dragging text out of the field, for which we use 'dragend'.                    // These are also needed in IE8 because of the bug described above.                    registerForSelectionChangeEvent(element, updateModel);  // 'selectionchange' covers cut, paste, drop, delete, etc.                    onEvent('dragend', deferUpdateModel);                }            } else {                // All other supported browsers support the 'input' event, which fires whenever the content of the element is changed                // through the user interface.                onEvent('input', updateModel);                if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {                    // Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'                    // but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.                    onEvent('keydown', deferUpdateModel);                    onEvent('paste', deferUpdateModel);                    onEvent('cut', deferUpdateModel);                } else if (operaVersion < 11) {                    // Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.                    // We can try to catch some of those using 'keydown'.                    onEvent('keydown', deferUpdateModel);                } else if (firefoxVersion < 4.0) {                    // Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete                    onEvent('DOMAutoComplete', updateModel);                    // Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.                    onEvent('dragdrop', updateModel);       // <3.5                    onEvent('drop', updateModel);           // 3.5                }            }        }        // Bind to the change event so that we can catch programmatic updates of the value that fire this event.        onEvent('change', updateModel);        ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });    }};ko.expressionRewriting.twoWayBindings['textInput'] = true;// textinput is an alias for textInputko.bindingHandlers['textinput'] = {    // preprocess is the only way to set up a full alias    'preprocess': function (value, name, addBinding) {        addBinding('textInput', value);    }};})();ko.bindingHandlers['uniqueName'] = {    'init': function (element, valueAccessor) {        if (valueAccessor()) {            var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);            ko.utils.setElementName(element, name);        }    }};ko.bindingHandlers['uniqueName'].currentIndex = 0;ko.bindingHandlers['value'] = {    'after': ['options', 'foreach'],    'init': function (element, valueAccessor, allBindings) {        // If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit        if (element.tagName.toLowerCase() == "input" && (element.type == "checkbox" || element.type == "radio")) {            ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });            return;        }        // Always catch "change" event; possibly other events too if asked        var eventsToCatch = ["change"];        var requestedEventsToCatch = allBindings.get("valueUpdate");        var propertyChangedFired = false;        var elementValueBeforeEvent = null;        if (requestedEventsToCatch) {            if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names                requestedEventsToCatch = [requestedEventsToCatch];            ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);            eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);        }        var valueUpdateHandler = function() {            elementValueBeforeEvent = null;            propertyChangedFired = false;            var modelValue = valueAccessor();            var elementValue = ko.selectExtensions.readValue(element);            ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);        }        // Workaround for https://github.com/SteveSanderson/knockout/issues/122        // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list        var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"                                       && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");        if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {            ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });            ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });            ko.utils.registerEventHandler(element, "blur", function() {                if (propertyChangedFired) {                    valueUpdateHandler();                }            });        }        ko.utils.arrayForEach(eventsToCatch, function(eventName) {            // The syntax "after<eventname>" means "run the handler asynchronously after the event"            // This is useful, for example, to catch "keydown" events after the browser has updated the control            // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)            var handler = valueUpdateHandler;            if (ko.utils.stringStartsWith(eventName, "after")) {                handler = function() {                    // The elementValueBeforeEvent variable is non-null *only* during the brief gap between                    // a keyX event firing and the valueUpdateHandler running, which is scheduled to happen                    // at the earliest asynchronous opportunity. We store this temporary information so that                    // if, between keyX and valueUpdateHandler, the underlying model value changes separately,                    // we can overwrite that model value change with the value the user just typed. Otherwise,                    // techniques like rateLimit can trigger model changes at critical moments that will                    // override the user's inputs, causing keystrokes to be lost.                    elementValueBeforeEvent = ko.selectExtensions.readValue(element);                    setTimeout(valueUpdateHandler, 0);                };                eventName = eventName.substring("after".length);            }            ko.utils.registerEventHandler(element, eventName, handler);        });        var updateFromModel = function () {            var newValue = ko.utils.unwrapObservable(valueAccessor());            var elementValue = ko.selectExtensions.readValue(element);            if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {                setTimeout(updateFromModel, 0);                return;            }            var valueHasChanged = (newValue !== elementValue);            if (valueHasChanged) {                if (ko.utils.tagNameLower(element) === "select") {                    var allowUnset = allBindings.get('valueAllowUnset');                    var applyValueAction = function () {                        ko.selectExtensions.writeValue(element, newValue, allowUnset);                    };                    applyValueAction();                    if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {                        // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,                        // because you're not allowed to have a model value that disagrees with a visible UI selection.                        ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);                    } else {                        // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread                        // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread                        // to apply the value as well.                        setTimeout(applyValueAction, 0);                    }                } else {                    ko.selectExtensions.writeValue(element, newValue);                }            }        };        ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });    },    'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding};ko.expressionRewriting.twoWayBindings['value'] = true;ko.bindingHandlers['visible'] = {    'update': function (element, valueAccessor) {        var value = ko.utils.unwrapObservable(valueAccessor());        var isCurrentlyVisible = !(element.style.display == "none");        if (value && !isCurrentlyVisible)            element.style.display = "";        else if ((!value) && isCurrentlyVisible)            element.style.display = "none";    }};// 'click' is just a shorthand for the usual full-length event:{click:handler}makeEventHandlerShortcut('click');// If you want to make a custom template engine,//// [1] Inherit from this class (like ko.nativeTemplateEngine does)// [2] Override 'renderTemplateSource', supplying a function with this signature:////        function (templateSource, bindingContext, options) {//            // - templateSource.text() is the text of the template you should render//            // - bindingContext.$data is the data you should pass into the template//            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,//            //     and bindingContext.$root available in the template too//            // - options gives you access to any other properties set on "data-bind: { template: options }"//            // - templateDocument is the document object of the template//            ////            // Return value: an array of DOM nodes//        }//// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:////        function (script) {//            // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"//            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'//        }////     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.//     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)//     and then you don't need to override 'createJavaScriptEvaluatorBlock'.ko.templateEngine = function () { };ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {    throw new Error("Override renderTemplateSource");};ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {    throw new Error("Override createJavaScriptEvaluatorBlock");};ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {    // Named template    if (typeof template == "string") {        templateDocument = templateDocument || document;        var elem = templateDocument.getElementById(template);        if (!elem)            throw new Error("Cannot find template with ID " + template);        return new ko.templateSources.domElement(elem);    } else if ((template.nodeType == 1) || (template.nodeType == 8)) {        // Anonymous template        return new ko.templateSources.anonymousTemplate(template);    } else        throw new Error("Unknown template type: " + template);};ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {    var templateSource = this['makeTemplateSource'](template, templateDocument);    return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);};ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {    // Skip rewriting if requested    if (this['allowTemplateRewriting'] === false)        return true;    return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");};ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {    var templateSource = this['makeTemplateSource'](template, templateDocument);    var rewritten = rewriterCallback(templateSource['text']());    templateSource['text'](rewritten);    templateSource['data']("isRewritten", true);};ko.exportSymbol('templateEngine', ko.templateEngine);ko.templateRewriting = (function () {    var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;    var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;    function validateDataBindValuesForRewriting(keyValueArray) {        var allValidators = ko.expressionRewriting.bindingRewriteValidators;        for (var i = 0; i < keyValueArray.length; i++) {            var key = keyValueArray[i]['key'];            if (allValidators.hasOwnProperty(key)) {                var validator = allValidators[key];                if (typeof validator === "function") {                    var possibleErrorMessage = validator(keyValueArray[i]['value']);                    if (possibleErrorMessage)                        throw new Error(possibleErrorMessage);                } else if (!validator) {                    throw new Error("This template engine does not support the '" + key + "' binding within its templates");                }            }        }    }    function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {        var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);        validateDataBindValuesForRewriting(dataBindKeyValueArray);        var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});        // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional        // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this        // extra indirection.        var applyBindingsToNextSiblingScript =            "ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";        return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;    }    return {        ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {            if (!templateEngine['isTemplateRewritten'](template, templateDocument))                templateEngine['rewriteTemplate'](template, function (htmlString) {                    return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);                }, templateDocument);        },        memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {            return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {                return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);            }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {                return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);            });        },        applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {            return ko.memoization.memoize(function (domNode, bindingContext) {                var nodeToBind = domNode.nextSibling;                if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {                    ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);                }            });        }    }})();// Exported only because it has to be referenced by string lookup from within rewritten templateko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);(function() {    // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving    // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)    //    // Two are provided by default:    //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element    //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but    //                                           without reading/writing the actual element text content, since it will be overwritten    //                                           with the rendered template output.    // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.    // Template sources need to have the following functions:    //   text() 			- returns the template text from your storage location    //   text(value)		- writes the supplied template text to your storage location    //   data(key)			- reads values stored using data(key, value) - see below    //   data(key, value)	- associates "value" with this template and the key "key". Is used to store information like "isRewritten".    //    // Optionally, template sources can also have the following functions:    //   nodes()            - returns a DOM element containing the nodes of this template, where available    //   nodes(value)       - writes the given DOM element to your storage location    // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()    // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().    //    // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were    // using and overriding "makeTemplateSource" to return an instance of your custom template source.    ko.templateSources = {};    // ---- ko.templateSources.domElement -----    ko.templateSources.domElement = function(element) {        this.domElement = element;    }    ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {        var tagNameLower = ko.utils.tagNameLower(this.domElement),            elemContentsProperty = tagNameLower === "script" ? "text"                                 : tagNameLower === "textarea" ? "value"                                 : "innerHTML";        if (arguments.length == 0) {            return this.domElement[elemContentsProperty];        } else {            var valueToWrite = arguments[0];            if (elemContentsProperty === "innerHTML")                ko.utils.setHtml(this.domElement, valueToWrite);            else                this.domElement[elemContentsProperty] = valueToWrite;        }    };    var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";    ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {        if (arguments.length === 1) {            return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);        } else {            ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);        }    };    // ---- ko.templateSources.anonymousTemplate -----    // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".    // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.    // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.    var anonymousTemplatesDomDataKey = ko.utils.domData.nextKey();    ko.templateSources.anonymousTemplate = function(element) {        this.domElement = element;    }    ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();    ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;    ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {        if (arguments.length == 0) {            var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};            if (templateData.textData === undefined && templateData.containerData)                templateData.textData = templateData.containerData.innerHTML;            return templateData.textData;        } else {            var valueToWrite = arguments[0];            ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});        }    };    ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {        if (arguments.length == 0) {            var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};            return templateData.containerData;        } else {            var valueToWrite = arguments[0];            ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});        }    };    ko.exportSymbol('templateSources', ko.templateSources);    ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);    ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);})();(function () {    var _templateEngine;    ko.setTemplateEngine = function (templateEngine) {        if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))            throw new Error("templateEngine must inherit from ko.templateEngine");        _templateEngine = templateEngine;    }    function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {        var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);        while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {            nextInQueue = ko.virtualElements.nextSibling(node);            action(node, nextInQueue);        }    }    function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {        // To be used on any nodes that have been rendered by a template and have been inserted into some parent element        // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because        // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,        // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings        // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)        if (continuousNodeArray.length) {            var firstNode = continuousNodeArray[0],                lastNode = continuousNodeArray[continuousNodeArray.length - 1],                parentNode = firstNode.parentNode,                provider = ko.bindingProvider['instance'],                preprocessNode = provider['preprocessNode'];            if (preprocessNode) {                invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {                    var nodePreviousSibling = node.previousSibling;                    var newNodes = preprocessNode.call(provider, node);                    if (newNodes) {                        if (node === firstNode)                            firstNode = newNodes[0] || nextNodeInRange;                        if (node === lastNode)                            lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;                    }                });                // Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.                // We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real                // first node needs to be in the array).                continuousNodeArray.length = 0;                if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do                    return;                }                if (firstNode === lastNode) {                    continuousNodeArray.push(firstNode);                } else {                    continuousNodeArray.push(firstNode, lastNode);                    ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);                }            }            // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)            // whereas a regular applyBindings won't introduce new memoized nodes            invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {                if (node.nodeType === 1 || node.nodeType === 8)                    ko.applyBindings(bindingContext, node);            });            invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {                if (node.nodeType === 1 || node.nodeType === 8)                    ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);            });            // Make sure any changes done by applyBindings or unmemoize are reflected in the array            ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);        }    }    function getFirstNodeFromPossibleArray(nodeOrNodeArray) {        return nodeOrNodeArray.nodeType ? nodeOrNodeArray                                        : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]                                        : null;    }    function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {        options = options || {};        var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);        var templateDocument = (firstTargetNode || template || {}).ownerDocument;        var templateEngineToUse = (options['templateEngine'] || _templateEngine);        ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);        var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);        // Loosely check result is an array of DOM nodes        if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))            throw new Error("Template engine must return an array of DOM nodes");        var haveAddedNodesToParent = false;        switch (renderMode) {            case "replaceChildren":                ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);                haveAddedNodesToParent = true;                break;            case "replaceNode":                ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);                haveAddedNodesToParent = true;                break;            case "ignoreTargetNode": break;            default:                throw new Error("Unknown renderMode: " + renderMode);        }        if (haveAddedNodesToParent) {            activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);            if (options['afterRender'])                ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);        }        return renderedNodesArray;    }    function resolveTemplateName(template, data, context) {        // The template can be specified as:        if (ko.isObservable(template)) {            // 1. An observable, with string value            return template();        } else if (typeof template === 'function') {            // 2. A function of (data, context) returning a string            return template(data, context);        } else {            // 3. A string            return template;        }    }    ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {        options = options || {};        if ((options['templateEngine'] || _templateEngine) == undefined)            throw new Error("Set a template engine before calling renderTemplate");        renderMode = renderMode || "replaceChildren";        if (targetNodeOrNodeArray) {            var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);            var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)            var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;            return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes                function () {                    // Ensure we've got a proper binding context to work with                    var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))                        ? dataOrBindingContext                        : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));                    var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),                        renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);                    if (renderMode == "replaceNode") {                        targetNodeOrNodeArray = renderedNodesArray;                        firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);                    }                },                null,                { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }            );        } else {            // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node            return ko.memoization.memoize(function (domNode) {                ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");            });        }    };    ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {        // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then        // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.        var arrayItemContext;        // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode        var executeTemplateForArrayItem = function (arrayValue, index) {            // Support selecting template as a function of the data being rendered            arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {                context['$index'] = index;            });            var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);            return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);        }        // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode        var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {            activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);            if (options['afterRender'])                options['afterRender'](addedNodesArray, arrayValue);            // release the "cache" variable, so that it can be collected by            // the GC when its value isn't used from within the bindings anymore.            arrayItemContext = null;        };        return ko.dependentObservable(function () {            var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];            if (typeof unwrappedArray.length == "undefined") // Coerce single value into array                unwrappedArray = [unwrappedArray];            // Filter out any entries marked as destroyed            var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {                return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);            });            // Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).            // If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.            ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);        }, null, { disposeWhenNodeIsRemoved: targetNode });    };    var templateComputedDomDataKey = ko.utils.domData.nextKey();    function disposeOldComputedAndStoreNewOne(element, newComputed) {        var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);        if (oldComputed && (typeof(oldComputed.dispose) == 'function'))            oldComputed.dispose();        ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);    }    ko.bindingHandlers['template'] = {        'init': function(element, valueAccessor) {            // Support anonymous templates            var bindingValue = ko.utils.unwrapObservable(valueAccessor());            if (typeof bindingValue == "string" || bindingValue['name']) {                // It's a named template - clear the element                ko.virtualElements.emptyNode(element);            } else if ('nodes' in bindingValue) {                // We've been given an array of DOM nodes. Save them as the template source.                // There is no known use case for the node array being an observable array (if the output                // varies, put that behavior *into* your template - that's what templates are for), and                // the implementation would be a mess, so assert that it's not observable.                var nodes = bindingValue['nodes'] || [];                if (ko.isObservable(nodes)) {                    throw new Error('The "nodes" option must be a plain, non-observable array.');                }                var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent                new ko.templateSources.anonymousTemplate(element)['nodes'](container);            } else {                // It's an anonymous template - store the element contents, then clear the element                var templateNodes = ko.virtualElements.childNodes(element),                    container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent                new ko.templateSources.anonymousTemplate(element)['nodes'](container);            }            return { 'controlsDescendantBindings': true };        },        'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {            var value = valueAccessor(),                dataValue,                options = ko.utils.unwrapObservable(value),                shouldDisplay = true,                templateComputed = null,                templateName;            if (typeof options == "string") {                templateName = value;                options = {};            } else {                templateName = options['name'];                // Support "if"/"ifnot" conditions                if ('if' in options)                    shouldDisplay = ko.utils.unwrapObservable(options['if']);                if (shouldDisplay && 'ifnot' in options)                    shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);                dataValue = ko.utils.unwrapObservable(options['data']);            }            if ('foreach' in options) {                // Render once for each data point (treating data set as empty if shouldDisplay==false)                var dataArray = (shouldDisplay && options['foreach']) || [];                templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);            } else if (!shouldDisplay) {                ko.virtualElements.emptyNode(element);            } else {                // Render once for this single data point (or use the viewModel if no data was provided)                var innerBindingContext = ('data' in options) ?                    bindingContext['createChildContext'](dataValue, options['as']) :  // Given an explitit 'data' value, we create a child binding context for it                    bindingContext;                                                        // Given no explicit 'data' value, we retain the same binding context                templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);            }            // It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)            disposeOldComputedAndStoreNewOne(element, templateComputed);        }    };    // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.    ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {        var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);        if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])            return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)        if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))            return null; // Named templates can be rewritten, so return "no error"        return "This template engine does not support anonymous templates nested within its templates";    };    ko.virtualElements.allowedBindings['template'] = true;})();ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);ko.exportSymbol('renderTemplate', ko.renderTemplate);// Go through the items that have been added and deleted and try to find matches between them.ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {    if (left.length && right.length) {        var failedCompares, l, r, leftItem, rightItem;        for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {            for (r = 0; rightItem = right[r]; ++r) {                if (leftItem['value'] === rightItem['value']) {                    leftItem['moved'] = rightItem['index'];                    rightItem['moved'] = leftItem['index'];                    right.splice(r, 1);         // This item is marked as moved; so remove it from right list                    failedCompares = r = 0;     // Reset failed compares count because we're checking for consecutive failures                    break;                }            }            failedCompares += r;        }    }};ko.utils.compareArrays = (function () {    var statusNotInOld = 'added', statusNotInNew = 'deleted';    // Simple calculation based on Levenshtein distance.    function compareArrays(oldArray, newArray, options) {        // For backward compatibility, if the third arg is actually a bool, interpret        // it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.        options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});        oldArray = oldArray || [];        newArray = newArray || [];        if (oldArray.length <= newArray.length)            return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);        else            return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);    }    function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {        var myMin = Math.min,            myMax = Math.max,            editDistanceMatrix = [],            smlIndex, smlIndexMax = smlArray.length,            bigIndex, bigIndexMax = bigArray.length,            compareRange = (bigIndexMax - smlIndexMax) || 1,            maxDistance = smlIndexMax + bigIndexMax + 1,            thisRow, lastRow,            bigIndexMaxForRow, bigIndexMinForRow;        for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {            lastRow = thisRow;            editDistanceMatrix.push(thisRow = []);            bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);            bigIndexMinForRow = myMax(0, smlIndex - 1);            for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {                if (!bigIndex)                    thisRow[bigIndex] = smlIndex + 1;                else if (!smlIndex)  // Top row - transform empty array into new array via additions                    thisRow[bigIndex] = bigIndex + 1;                else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])                    thisRow[bigIndex] = lastRow[bigIndex - 1];                  // copy value (no edit)                else {                    var northDistance = lastRow[bigIndex] || maxDistance;       // not in big (deletion)                    var westDistance = thisRow[bigIndex - 1] || maxDistance;    // not in small (addition)                    thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;                }            }        }        var editScript = [], meMinusOne, notInSml = [], notInBig = [];        for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {            meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;            if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {                notInSml.push(editScript[editScript.length] = {     // added                    'status': statusNotInSml,                    'value': bigArray[--bigIndex],                    'index': bigIndex });            } else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {                notInBig.push(editScript[editScript.length] = {     // deleted                    'status': statusNotInBig,                    'value': smlArray[--smlIndex],                    'index': smlIndex });            } else {                --bigIndex;                --smlIndex;                if (!options['sparse']) {                    editScript.push({                        'status': "retained",                        'value': bigArray[bigIndex] });                }            }        }        // Set a limit on the number of consecutive non-matching comparisons; having it a multiple of        // smlIndexMax keeps the time complexity of this algorithm linear.        ko.utils.findMovesInArrayComparison(notInSml, notInBig, smlIndexMax * 10);        return editScript.reverse();    }    return compareArrays;})();ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);(function () {    // Objective:    // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,    //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node    // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node    //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we    //   previously mapped - retain those nodes, and just insert/delete other ones    // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node    // You can use this, for example, to activate bindings on those nodes.    function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {        // Map this array value inside a dependentObservable so we re-map when any dependency changes        var mappedNodes = [];        var dependentObservable = ko.dependentObservable(function() {            var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];            // On subsequent evaluations, just replace the previously-inserted DOM nodes            if (mappedNodes.length > 0) {                ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);                if (callbackAfterAddingNodes)                    ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);            }            // Replace the contents of the mappedNodes array, thereby updating the record            // of which nodes would be deleted if valueToMap was itself later removed            mappedNodes.length = 0;            ko.utils.arrayPushAll(mappedNodes, newMappedNodes);        }, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });        return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };    }    var lastMappingResultDomDataKey = ko.utils.domData.nextKey();    ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {        // Compare the provided array against the previous one        array = array || [];        options = options || {};        var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;        var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];        var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });        var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);        // Build the new mapping result        var newMappingResult = [];        var lastMappingResultIndex = 0;        var newMappingResultIndex = 0;        var nodesToDelete = [];        var itemsToProcess = [];        var itemsForBeforeRemoveCallbacks = [];        var itemsForMoveCallbacks = [];        var itemsForAfterAddCallbacks = [];        var mapData;        function itemMovedOrRetained(editScriptIndex, oldPosition) {            mapData = lastMappingResult[oldPosition];            if (newMappingResultIndex !== oldPosition)                itemsForMoveCallbacks[editScriptIndex] = mapData;            // Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray            mapData.indexObservable(newMappingResultIndex++);            ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);            newMappingResult.push(mapData);            itemsToProcess.push(mapData);        }        function callCallback(callback, items) {            if (callback) {                for (var i = 0, n = items.length; i < n; i++) {                    if (items[i]) {                        ko.utils.arrayForEach(items[i].mappedNodes, function(node) {                            callback(node, i, items[i].arrayEntry);                        });                    }                }            }        }        for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {            movedIndex = editScriptItem['moved'];            switch (editScriptItem['status']) {                case "deleted":                    if (movedIndex === undefined) {                        mapData = lastMappingResult[lastMappingResultIndex];                        // Stop tracking changes to the mapping for these nodes                        if (mapData.dependentObservable)                            mapData.dependentObservable.dispose();                        // Queue these nodes for later removal                        nodesToDelete.push.apply(nodesToDelete, ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode));                        if (options['beforeRemove']) {                            itemsForBeforeRemoveCallbacks[i] = mapData;                            itemsToProcess.push(mapData);                        }                    }                    lastMappingResultIndex++;                    break;                case "retained":                    itemMovedOrRetained(i, lastMappingResultIndex++);                    break;                case "added":                    if (movedIndex !== undefined) {                        itemMovedOrRetained(i, movedIndex);                    } else {                        mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };                        newMappingResult.push(mapData);                        itemsToProcess.push(mapData);                        if (!isFirstExecution)                            itemsForAfterAddCallbacks[i] = mapData;                    }                    break;            }        }        // Call beforeMove first before any changes have been made to the DOM        callCallback(options['beforeMove'], itemsForMoveCallbacks);        // Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)        ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);        // Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)        for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {            // Get nodes for newly added items            if (!mapData.mappedNodes)                ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));            // Put nodes in the right place if they aren't there already            for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {                if (node !== nextNode)                    ko.virtualElements.insertAfter(domNode, node, lastNode);            }            // Run the callbacks for newly added nodes (for example, to apply bindings, etc.)            if (!mapData.initialized && callbackAfterAddingNodes) {                callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);                mapData.initialized = true;            }        }        // If there's a beforeRemove callback, call it after reordering.        // Note that we assume that the beforeRemove callback will usually be used to remove the nodes using        // some sort of animation, which is why we first reorder the nodes that will be removed. If the        // callback instead removes the nodes right away, it would be more efficient to skip reordering them.        // Perhaps we'll make that change in the future if this scenario becomes more common.        callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);        // Finally call afterMove and afterAdd callbacks        callCallback(options['afterMove'], itemsForMoveCallbacks);        callCallback(options['afterAdd'], itemsForAfterAddCallbacks);        // Store a copy of the array items we just considered so we can difference it next time        ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);    }})();ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);ko.nativeTemplateEngine = function () {    this['allowTemplateRewriting'] = false;}ko.nativeTemplateEngine.prototype = new ko.templateEngine();ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {    var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly        templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,        templateNodes = templateNodesFunc ? templateSource['nodes']() : null;    if (templateNodes) {        return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);    } else {        var templateText = templateSource['text']();        return ko.utils.parseHtmlFragment(templateText, templateDocument);    }};ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();ko.setTemplateEngine(ko.nativeTemplateEngine.instance);ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);(function() {    ko.jqueryTmplTemplateEngine = function () {        // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl        // doesn't expose a version number, so we have to infer it.        // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,        // which KO internally refers to as version "2", so older versions are no longer detected.        var jQueryTmplVersion = this.jQueryTmplVersion = (function() {            if (!jQueryInstance || !(jQueryInstance['tmpl']))                return 0;            // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.            try {                if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {                    // Since 1.0.0pre, custom tags should append markup to an array called "__"                    return 2; // Final version of jquery.tmpl                }            } catch(ex) { /* Apparently not the version we were looking for */ }            return 1; // Any older version that we don't support        })();        function ensureHasReferencedJQueryTemplates() {            if (jQueryTmplVersion < 2)                throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");        }        function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {            return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);        }        this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {            templateDocument = templateDocument || document;            options = options || {};            ensureHasReferencedJQueryTemplates();            // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)            var precompiled = templateSource['data']('precompiled');            if (!precompiled) {                var templateText = templateSource['text']() || "";                // Wrap in "with($whatever.koBindingContext) { ... }"                templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";                precompiled = jQueryInstance['template'](null, templateText);                templateSource['data']('precompiled', precompiled);            }            var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays            var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);            var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);            resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work            jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders            return resultNodes;        };        this['createJavaScriptEvaluatorBlock'] = function(script) {            return "{{ko_code ((function() { return " + script + " })()) }}";        };        this['addTemplate'] = function(templateName, templateMarkup) {            document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");        };        if (jQueryTmplVersion > 0) {            jQueryInstance['tmpl']['tag']['ko_code'] = {                open: "__.push($1 || '');"            };            jQueryInstance['tmpl']['tag']['ko_with'] = {                open: "with($1) {",                close: "} "            };        }    };    ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();    ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;    // Use this one by default *only if jquery.tmpl is referenced*    var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();    if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)        ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);    ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);})();}));}());})();
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