12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970197119721973197419751976197719781979198019811982198319841985198619871988198919901991199219931994199519961997199819992000200120022003200420052006200720082009201020112012201320142015201620172018201920202021202220232024202520262027202820292030203120322033203420352036203720382039204020412042204320442045204620472048204920502051205220532054205520562057205820592060206120622063206420652066206720682069207020712072207320742075207620772078207920802081208220832084208520862087208820892090209120922093209420952096209720982099210021012102210321042105210621072108210921102111211221132114211521162117211821192120212121222123212421252126212721282129213021312132213321342135213621372138213921402141214221432144214521462147214821492150215121522153215421552156215721582159216021612162216321642165216621672168216921702171217221732174217521762177217821792180218121822183218421852186218721882189219021912192219321942195219621972198219922002201220222032204220522062207220822092210221122122213221422152216221722182219222022212222222322242225222622272228222922302231223222332234223522362237223822392240224122422243224422452246224722482249225022512252225322542255225622572258225922602261226222632264226522662267226822692270227122722273227422752276227722782279228022812282228322842285228622872288228922902291229222932294229522962297229822992300230123022303230423052306230723082309231023112312231323142315231623172318231923202321232223232324232523262327232823292330233123322333233423352336233723382339234023412342234323442345234623472348234923502351235223532354235523562357235823592360236123622363236423652366236723682369237023712372237323742375237623772378237923802381238223832384238523862387238823892390239123922393239423952396239723982399240024012402240324042405240624072408240924102411241224132414241524162417241824192420242124222423242424252426242724282429243024312432243324342435243624372438243924402441244224432444244524462447244824492450245124522453245424552456245724582459246024612462246324642465246624672468246924702471247224732474247524762477247824792480248124822483248424852486248724882489249024912492249324942495249624972498249925002501250225032504250525062507250825092510251125122513251425152516251725182519252025212522252325242525252625272528252925302531253225332534253525362537253825392540254125422543254425452546254725482549255025512552255325542555255625572558255925602561256225632564256525662567256825692570257125722573257425752576257725782579258025812582258325842585258625872588258925902591259225932594259525962597259825992600260126022603260426052606260726082609261026112612261326142615261626172618261926202621262226232624262526262627262826292630263126322633263426352636263726382639264026412642264326442645264626472648264926502651265226532654265526562657265826592660266126622663266426652666266726682669267026712672267326742675267626772678267926802681268226832684268526862687268826892690269126922693269426952696269726982699270027012702270327042705270627072708270927102711271227132714271527162717271827192720272127222723272427252726272727282729273027312732273327342735273627372738273927402741274227432744274527462747274827492750275127522753275427552756275727582759276027612762276327642765276627672768276927702771277227732774277527762777277827792780278127822783278427852786278727882789279027912792279327942795279627972798279928002801280228032804280528062807280828092810281128122813281428152816281728182819282028212822282328242825282628272828282928302831283228332834283528362837283828392840284128422843284428452846284728482849285028512852285328542855285628572858285928602861286228632864286528662867286828692870287128722873287428752876287728782879288028812882288328842885288628872888288928902891289228932894289528962897289828992900290129022903290429052906290729082909291029112912291329142915291629172918291929202921292229232924292529262927292829292930293129322933293429352936293729382939294029412942294329442945294629472948294929502951295229532954295529562957295829592960296129622963296429652966296729682969297029712972297329742975297629772978297929802981298229832984298529862987298829892990299129922993299429952996299729982999300030013002300330043005300630073008300930103011301230133014301530163017301830193020302130223023302430253026302730283029303030313032303330343035303630373038303930403041304230433044304530463047304830493050305130523053305430553056305730583059306030613062306330643065306630673068306930703071307230733074307530763077307830793080308130823083308430853086308730883089309030913092309330943095309630973098309931003101310231033104310531063107310831093110311131123113311431153116311731183119312031213122312331243125312631273128312931303131313231333134313531363137313831393140314131423143314431453146314731483149315031513152315331543155315631573158315931603161316231633164316531663167316831693170317131723173317431753176317731783179318031813182318331843185318631873188318931903191319231933194319531963197319831993200320132023203320432053206320732083209321032113212321332143215321632173218321932203221322232233224322532263227322832293230323132323233323432353236323732383239324032413242324332443245324632473248324932503251325232533254325532563257325832593260326132623263326432653266326732683269327032713272327332743275327632773278327932803281328232833284328532863287328832893290329132923293329432953296329732983299330033013302330333043305330633073308330933103311331233133314331533163317331833193320332133223323332433253326332733283329333033313332333333343335333633373338333933403341334233433344334533463347334833493350335133523353335433553356335733583359336033613362336333643365336633673368336933703371337233733374337533763377337833793380338133823383338433853386338733883389339033913392339333943395339633973398339934003401340234033404340534063407340834093410341134123413341434153416341734183419342034213422342334243425342634273428342934303431343234333434343534363437343834393440344134423443344434453446344734483449345034513452345334543455345634573458345934603461346234633464346534663467346834693470347134723473347434753476347734783479348034813482348334843485348634873488348934903491349234933494349534963497349834993500350135023503350435053506350735083509351035113512351335143515351635173518351935203521352235233524352535263527352835293530353135323533353435353536353735383539354035413542354335443545354635473548354935503551355235533554355535563557355835593560356135623563356435653566356735683569357035713572357335743575357635773578357935803581358235833584358535863587358835893590359135923593359435953596359735983599360036013602360336043605360636073608360936103611361236133614361536163617361836193620362136223623362436253626362736283629363036313632363336343635363636373638363936403641364236433644364536463647364836493650365136523653365436553656365736583659366036613662366336643665366636673668366936703671367236733674367536763677367836793680368136823683368436853686368736883689369036913692369336943695369636973698369937003701370237033704370537063707370837093710371137123713371437153716371737183719372037213722372337243725372637273728372937303731373237333734373537363737373837393740374137423743374437453746374737483749375037513752375337543755375637573758375937603761376237633764376537663767376837693770377137723773377437753776377737783779378037813782378337843785378637873788378937903791379237933794379537963797379837993800380138023803380438053806380738083809381038113812381338143815381638173818381938203821382238233824382538263827382838293830383138323833383438353836383738383839384038413842384338443845384638473848384938503851385238533854385538563857385838593860386138623863386438653866386738683869387038713872387338743875387638773878387938803881388238833884388538863887388838893890389138923893389438953896389738983899390039013902390339043905390639073908390939103911391239133914391539163917391839193920392139223923392439253926392739283929393039313932393339343935393639373938393939403941394239433944394539463947394839493950395139523953395439553956395739583959396039613962396339643965396639673968396939703971397239733974397539763977397839793980398139823983398439853986398739883989399039913992399339943995399639973998399940004001400240034004400540064007400840094010401140124013401440154016401740184019402040214022402340244025402640274028402940304031403240334034403540364037403840394040404140424043404440454046404740484049405040514052405340544055405640574058405940604061406240634064406540664067406840694070407140724073407440754076407740784079408040814082408340844085408640874088408940904091409240934094409540964097409840994100410141024103410441054106410741084109411041114112411341144115411641174118411941204121412241234124412541264127412841294130413141324133413441354136413741384139414041414142414341444145414641474148414941504151415241534154415541564157415841594160416141624163416441654166416741684169417041714172417341744175417641774178417941804181418241834184418541864187418841894190419141924193419441954196419741984199420042014202420342044205420642074208420942104211421242134214421542164217421842194220422142224223422442254226422742284229423042314232423342344235423642374238423942404241424242434244424542464247424842494250425142524253425442554256425742584259426042614262426342644265426642674268426942704271427242734274427542764277427842794280428142824283428442854286428742884289429042914292429342944295429642974298429943004301430243034304430543064307430843094310431143124313431443154316431743184319432043214322432343244325432643274328432943304331433243334334433543364337433843394340434143424343434443454346434743484349435043514352435343544355435643574358435943604361436243634364436543664367436843694370437143724373437443754376437743784379438043814382438343844385438643874388438943904391439243934394439543964397439843994400440144024403440444054406440744084409441044114412441344144415441644174418441944204421442244234424442544264427442844294430443144324433443444354436443744384439444044414442444344444445444644474448444944504451445244534454445544564457445844594460446144624463446444654466446744684469 |
- // Knockout JavaScript library v3.1.0
- // (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'],
- jQuery = window["jQuery"],
- JSON = window["JSON"];
- (function(factory) {
- // Support three module loading scenarios
- if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
- // [1] CommonJS/Node.js
- var target = module['exports'] || exports; // module.exports is for Node.js
- factory(target);
- } else if (typeof define === 'function' && define['amd']) {
- // [2] AMD anonymous module
- define(['exports'], factory);
- } else {
- // [3] No module loader (plain <script> tag) - put directly in global namespace
- factory(window['ko'] = {});
- }
- }(function(koExports){
- // 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 = "3.1.0";
- 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");
- }
- 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 container = document.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.shift();
- // 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, '');
- },
- stringTokenize: function (string, delimiter) {
- var result = [];
- var tokens = (string || "").split(delimiter);
- for (var i = 0, j = tokens.length; i < j; i++) {
- var trimmed = ko.utils.stringTrim(tokens[i]);
- if (trimmed !== "")
- result.push(trimmed);
- }
- return result;
- },
- 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 && jQuery) {
- jQuery(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 (jQuery && !useClickWorkaround) {
- jQuery(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: function (node, classNames, shouldHaveClass) {
- if (classNames) {
- var cssClassNameRegex = /\S+/g,
- currentClassNames = node.className.match(cssClassNameRegex) || [];
- ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
- ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
- });
- node.className = currentClassNames.join(" ");
- }
- },
- 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.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.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('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
- if (!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, args = Array.prototype.slice.call(arguments), object = args.shift();
- return function () {
- return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
- };
- };
- }
- 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 fully
- ko.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 (jQuery && (typeof jQuery['cleanData'] == "function"))
- jQuery['cleanData']([node]);
- }
- }
- })();
- ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
- ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
- ko.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) {
- // 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 = document.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 window['innerShiv'] == "function") {
- div.appendChild(window['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) {
- // jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
- if (jQuery['parseHTML']) {
- return jQuery['parseHTML'](html) || []; // 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 = jQuery['clean']([html]);
- // 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) {
- return jQuery ? jQueryHtmlParse(html) // As below, benefit from jQuery's optimisations where possible
- : simpleHtmlParse(html); // ... 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 (jQuery) {
- jQuery(node)['html'](html);
- } else {
- // ... otherwise, use KO's own parsing logic.
- var parsedNodes = ko.utils.parseHtmlFragment(html);
- 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 = {};
- }
- 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);
- });
- // This will force a computed with deferEvaluation to evaluate before any subscriptions
- // are registered.
- if (self.peek) {
- self.peek();
- }
- if (!self._subscriptions[event])
- self._subscriptions[event] = [];
- self._subscriptions[event].push(subscription);
- return subscription;
- },
- "notifySubscribers": function (valueToNotify, event) {
- event = event || defaultEvent;
- 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
- }
- }
- },
- 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 () {
- 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.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 constructor
- if (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.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 stale
- ko.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 arrays
- ko.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 constructor
- if (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,
- pendingNotifications = 0,
- underlyingSubscribeFunction = target.subscribe;
- // Intercept "subscribe" calls, and for array change events, ensure change tracking is enabled
- target.subscribe = target['subscribe'] = function(callback, callbackTarget, event) {
- if (event === arrayChangeEventName) {
- trackChanges();
- }
- return underlyingSubscribeFunction.apply(this, arguments);
- };
- 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;
- 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);
- if (changes.length) {
- target['notifySubscribers'](changes, arrayChangeEventName);
- }
- }
- // Eliminate references to the old, removed items, so they can be GCed
- previousContents = currentContents;
- cachedDiff = null;
- pendingNotifications = 0;
- });
- }
- 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;
- 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 addSubscriptionToDependency(subscribable, id) {
- if (!_subscriptionsToDependencies[id]) {
- _subscriptionsToDependencies[id] = subscribable.subscribe(evaluatePossiblyAsync);
- ++_dependenciesCount;
- }
- }
- function disposeAllSubscriptionsToDependencies() {
- _isDisposed = true;
- ko.utils.objectForEach(_subscriptionsToDependencies, function (id, subscription) {
- subscription.dispose();
- });
- _subscriptionsToDependencies = {};
- _dependenciesCount = 0;
- _needsEvaluation = false;
- }
- function evaluatePossiblyAsync() {
- var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
- if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
- clearTimeout(evaluationTimeoutInstance);
- evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
- } else if (dependentObservable._evalRateLimited) {
- dependentObservable._evalRateLimited();
- } else {
- evaluateImmediate();
- }
- }
- function evaluateImmediate() {
- 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 = _subscriptionsToDependencies, disposalCount = _dependenciesCount;
- 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
- _subscriptionsToDependencies[id] = disposalCandidates[id];
- ++_dependenciesCount;
- delete disposalCandidates[id];
- --disposalCount;
- } else {
- // Brand new subscription - add it
- addSubscriptionToDependency(subscribable, id);
- }
- }
- },
- computed: dependentObservable,
- isInitial: !_dependenciesCount // If we're evaluating when there are no previous dependencies, it must be the first time
- });
- _subscriptionsToDependencies = {};
- _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) {
- ko.utils.objectForEach(disposalCandidates, function(id, toDispose) {
- toDispose.dispose();
- });
- }
- _needsEvaluation = false;
- }
- if (dependentObservable.isDifferent(_latestValue, newValue)) {
- dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
- _latestValue = newValue;
- if (DEBUG) dependentObservable._latestValue = _latestValue;
- // If rate-limited, the notification will happen within the limit function. Otherwise,
- // notify as soon as the value changes. Check specifically for the throttle setting since
- // it overrides rateLimit.
- if (!dependentObservable._evalRateLimited || dependentObservable['throttleEvaluation']) {
- dependentObservable["notifySubscribers"](_latestValue);
- }
- }
- } 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
- if (_needsEvaluation)
- evaluateImmediate();
- ko.dependencyDetection.registerDependency(dependentObservable);
- return _latestValue;
- }
- }
- function peek() {
- // Peek won't re-evaluate, except to get the initial value when "deferEvaluation" is set.
- // That's the only time that both of these conditions will be satisfied.
- if (_needsEvaluation && !_dependenciesCount)
- evaluateImmediate();
- return _latestValue;
- }
- function isActive() {
- return _needsEvaluation || _dependenciesCount > 0;
- }
- // 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 = disposeAllSubscriptionsToDependencies,
- _subscriptionsToDependencies = {},
- _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 options["write"] === "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);
- }
- };
- 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 deferEvaluation is true
- if (options['deferEvaluation'] !== true)
- 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);
- disposeAllSubscriptionsToDependencies();
- };
- 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 constructor
- if (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);
- (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) {
- if (key)
- result.push(values ? {key: key, value: values.join('')} : {'unknown': key});
- key = values = depth = 0;
- continue;
- }
- // Simply skip the colon that separates the name and value
- } else if (c === 58) { // ":"
- if (!values)
- 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 must be a single token; if it's a string, trim the quotes
- } else if (!key && !values) {
- key = (c === 34 || c === 39) /* '"', "'" */ ? tok.slice(1, -1) : tok;
- continue;
- }
- if (values)
- values.push(tok);
- else
- values = [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 (!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'],
- 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 minified
- ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
- //ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
- ko.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: return node.getAttribute(defaultBindingAttributeName) != null; // Element
- case 8: return ko.virtualElements.hasBindingValue(node); // Comment node
- default: return false;
- }
- },
- 'getBindings': function(node, bindingContext) {
- var bindingsString = this['getBindingsString'](node, bindingContext);
- return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
- },
- 'getBindingAccessors': function(node, bindingContext) {
- var bindingsString = this['getBindingsString'](node, bindingContext);
- return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, {'valueAccessors':true}) : 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.
- '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> contents,
- // because it's unexpected and a potential XSS issue
- 'script': 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 (!jQuery && window['jQuery']) {
- jQuery = 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);
- })();
- 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) {
- function checkedValue() {
- return allBindings['has']('checkedValue')
- ? ko.utils.unwrapObservable(allBindings.get('checkedValue'))
- : 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 (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 bindings
- ko.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 alias
- ko.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 if
- function 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 handlers
- makeWithIfBinding('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;
- var previousScrollTop = (!selectWasPreviouslyEmpty && element.multiple) ? element.scrollTop : null;
- var unwrappedArray = ko.utils.unwrapObservable(valueAccessor());
- var includeDestroyed = allBindings.get('optionsIncludeDestroyed');
- var arrayToDomNodeChildrenOptions = {};
- var captionValue;
- var filteredArray;
- var previousSelectedValues;
- if (element.multiple) {
- previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
- } else {
- previousSelectedValues = element.selectedIndex >= 0 ? [ 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 = 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) {
- // 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.
- if (previousSelectedValues.length) {
- 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')) {
- 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 (allBindings.get('valueAllowUnset') && allBindings['has']('value')) {
- // 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 (element.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);
- element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
- });
- }
- };
- 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;
- 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) {
- // Always catch "change" event; possibly other events too if asked
- var eventsToCatch = ["change"];
- var requestedEventsToCatch = allBindings.get("valueUpdate");
- var propertyChangedFired = false;
- 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() {
- 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() { setTimeout(valueUpdateHandler, 0) };
- eventName = eventName.substring("after".length);
- }
- ko.utils.registerEventHandler(element, eventName, handler);
- });
- },
- 'update': function (element, valueAccessor, allBindings) {
- var newValue = ko.utils.unwrapObservable(valueAccessor());
- var elementValue = ko.selectExtensions.readValue(element);
- 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.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 }"
- // //
- // // 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) {
- 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);
- };
- 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 template
- ko.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 && firstTargetNode.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;
- }
- 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));
- // Support selecting template as a function of the data being rendered
- var templateName = ko.isObservable(template) ? template()
- : typeof(template) == 'function' ? template(bindingContext['$data'], bindingContext) : template;
- var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
- if (renderMode == "replaceNode") {
- targetNodeOrNodeArray = renderedNodesArray;
- firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
- }
- },
- null,
- { disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
- );
- } else {
- // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
- return ko.memoization.memoize(function (domNode) {
- ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
- });
- }
- };
- ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
- // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
- // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
- var arrayItemContext;
- // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
- var executeTemplateForArrayItem = function (arrayValue, index) {
- // Support selecting template as a function of the data being rendered
- arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {
- context['$index'] = index;
- });
- var templateName = typeof(template) == 'function' ? template(arrayValue, arrayItemContext) : template;
- 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);
- };
- 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 {
- // 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) {
- 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);
- }
- };
- 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 (!jQuery || !(jQuery['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 (jQuery['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 jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
- }
- this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
- 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 $item.koBindingContext}}" + templateText + "{{/ko_with}}";
- precompiled = jQuery['template'](null, templateText);
- templateSource['data']('precompiled', precompiled);
- }
- var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
- var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
- var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
- resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
- jQuery['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) {
- jQuery['tmpl']['tag']['ko_code'] = {
- open: "__.push($1 || '');"
- };
- jQuery['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);
- })();
- }));
- }());
- })();
|