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refactor such that only base.js is necessary for native HTMLImports.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,158 @@ | ||
| /* | ||
| * Copyright 2013 The Polymer Authors. All rights reserved. | ||
| * Use of this source code is governed by a BSD-style | ||
| * license that can be found in the LICENSE file. | ||
| */ | ||
|
|
||
| (function(scope) { | ||
|
|
||
| var hasNative = ('import' in document.createElement('link')); | ||
| var useNative = hasNative; | ||
|
|
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| // TODO(sorvell): SD polyfill intrusion | ||
| var mainDoc = window.ShadowDOMPolyfill ? | ||
| ShadowDOMPolyfill.wrapIfNeeded(document) : document; | ||
|
|
||
| // NOTE: We cannot polyfill document.currentScript because it's not possible | ||
| // both to override and maintain the ability to capture the native value; | ||
| // therefore we choose to expose _currentScript both when native imports | ||
| // and the polyfill are in use. | ||
| var currentScriptDescriptor = { | ||
| get: function() { | ||
| return HTMLImports.currentScript || document.currentScript; | ||
| }, | ||
| configurable: true | ||
| }; | ||
|
|
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| Object.defineProperty(document, '_currentScript', currentScriptDescriptor); | ||
| Object.defineProperty(mainDoc, '_currentScript', currentScriptDescriptor); | ||
|
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| // call a callback when all HTMLImports in the document at call (or at least | ||
| // document ready) time have loaded. | ||
| // 1. ensure the document is in a ready state (has dom), then | ||
| // 2. watch for loading of imports and call callback when done | ||
| function whenImportsReady(callback, doc) { | ||
| doc = doc || mainDoc; | ||
| // if document is loading, wait and try again | ||
| whenDocumentReady(function() { | ||
| watchImportsLoad(callback, doc); | ||
| }, doc); | ||
| } | ||
|
|
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| // call the callback when the document is in a ready state (has dom) | ||
| var requiredReadyState = HTMLImports.isIE ? 'complete' : 'interactive'; | ||
| var READY_EVENT = 'readystatechange'; | ||
| function isDocumentReady(doc) { | ||
| return (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState); | ||
| } | ||
|
|
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| // call <callback> when we ensure the document is in a ready state | ||
| function whenDocumentReady(callback, doc) { | ||
| if (!isDocumentReady(doc)) { | ||
| var checkReady = function() { | ||
| if (doc.readyState === 'complete' || | ||
| doc.readyState === requiredReadyState) { | ||
| doc.removeEventListener(READY_EVENT, checkReady); | ||
| whenDocumentReady(callback, doc); | ||
| } | ||
| } | ||
| doc.addEventListener(READY_EVENT, checkReady); | ||
| } else if (callback) { | ||
| callback(); | ||
| } | ||
| } | ||
|
|
||
| // call <callback> when we ensure all imports have loaded | ||
| function watchImportsLoad(callback, doc) { | ||
| var imports = doc.querySelectorAll('link[rel=import]'); | ||
| var loaded = 0, l = imports.length; | ||
| function checkDone(d) { | ||
| if (loaded == l) { | ||
| callback && callback(); | ||
| } | ||
| } | ||
| function loadedImport(e) { | ||
| loaded++; | ||
| checkDone(); | ||
| } | ||
| if (l) { | ||
| for (var i=0, imp; (i<l) && (imp=imports[i]); i++) { | ||
| if (isImportLoaded(imp)) { | ||
| loadedImport.call(imp); | ||
| } else { | ||
| imp.addEventListener('load', loadedImport); | ||
| imp.addEventListener('error', loadedImport); | ||
| } | ||
| } | ||
| } else { | ||
| checkDone(); | ||
| } | ||
| } | ||
|
|
||
| function isImportLoaded(link) { | ||
| return useNative ? (link.import && (link.import.readyState !== 'loading')) || link.__loaded : | ||
| link.__importParsed; | ||
| } | ||
|
|
||
| // TODO(sorvell): install a mutation observer to see if HTMLImports have loaded | ||
| // this is a workaround for https://www.w3.org/Bugs/Public/show_bug.cgi?id=25007 | ||
| // and should be removed when this bug is addressed. | ||
| if (useNative) { | ||
| new MutationObserver(function(mxns) { | ||
| for (var i=0, l=mxns.length, m; (i < l) && (m=mxns[i]); i++) { | ||
| if (m.addedNodes) { | ||
| handleImports(m.addedNodes); | ||
| } | ||
| } | ||
| }).observe(document.head, {childList: true}); | ||
|
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| function handleImports(nodes) { | ||
| for (var i=0, l=nodes.length, n; (i<l) && (n=nodes[i]); i++) { | ||
| if (isImport(n)) { | ||
| handleImport(n); | ||
| } | ||
| } | ||
| } | ||
|
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| function isImport(element) { | ||
| return element.localName === 'link' && element.rel === 'import'; | ||
| } | ||
|
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| function handleImport(element) { | ||
| var loaded = element.import; | ||
| if (loaded) { | ||
| markTargetLoaded({target: element}); | ||
| } else { | ||
| element.addEventListener('load', markTargetLoaded); | ||
| element.addEventListener('error', markTargetLoaded); | ||
| } | ||
| } | ||
|
|
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| function markTargetLoaded(event) { | ||
| event.target.__loaded = true; | ||
| } | ||
|
|
||
| } | ||
|
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| // Fire the 'HTMLImportsLoaded' event when imports in document at load time | ||
| // have loaded. This event is required to simulate the script blocking | ||
| // behavior of native imports. A main document script that needs to be sure | ||
| // imports have loaded should wait for this event. | ||
| whenImportsReady(function() { | ||
| HTMLImports.ready = true; | ||
| HTMLImports.readyTime = new Date().getTime(); | ||
| mainDoc.dispatchEvent( | ||
| new CustomEvent('HTMLImportsLoaded', {bubbles: true}) | ||
| ); | ||
| }); | ||
|
|
||
| // exports | ||
| scope.useNative = useNative; | ||
| scope.isImportLoaded = isImportLoaded; | ||
| scope.whenReady = whenImportsReady; | ||
|
|
||
| // deprecated | ||
| scope.whenImportsReady = whenImportsReady; | ||
|
|
||
| })(window.HTMLImports); |
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