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| 1 /** |
| 2 * @license |
| 3 * Copyright (c) 2017 The Polymer Project Authors. All rights reserved. |
| 4 * This code may only be used under the BSD style license found at http://polyme
r.github.io/LICENSE.txt |
| 5 * The complete set of authors may be found at http://polymer.github.io/AUTHORS.
txt |
| 6 * The complete set of contributors may be found at http://polymer.github.io/CON
TRIBUTORS.txt |
| 7 * Code distributed by Google as part of the polymer project is also |
| 8 * subject to an additional IP rights grant found at http://polymer.github.io/PA
TENTS.txt |
| 9 */ |
| 10 |
| 11 (function() { |
| 12 'use strict'; |
| 13 // global for (1) existence means `WebComponentsReady` will file, |
| 14 // (2) WebComponents.ready == true means event has fired. |
| 15 window.WebComponents = window.WebComponents || {}; |
| 16 var name = 'webcomponents-loader.js'; |
| 17 // Feature detect which polyfill needs to be imported. |
| 18 var polyfills = []; |
| 19 if (!('import' in document.createElement('link'))) { |
| 20 polyfills.push('hi'); |
| 21 } |
| 22 if (!('attachShadow' in Element.prototype && 'getRootNode' in Element.prototyp
e) || |
| 23 (window.ShadyDOM && window.ShadyDOM.force)) { |
| 24 polyfills.push('sd'); |
| 25 } |
| 26 if (!window.customElements || window.customElements.forcePolyfill) { |
| 27 polyfills.push('ce'); |
| 28 } |
| 29 // NOTE: any browser that does not have template or ES6 features |
| 30 // must load the full suite (called `lite` for legacy reasons) of polyfills. |
| 31 if (!('content' in document.createElement('template')) || !window.Promise || !
Array.from || |
| 32 // Edge has broken fragment cloning which means you cannot clone template.co
ntent |
| 33 !(document.createDocumentFragment().cloneNode() instanceof DocumentFragment)
) { |
| 34 polyfills = ['lite']; |
| 35 } |
| 36 |
| 37 if (polyfills.length) { |
| 38 var script = document.querySelector('script[src*="' + name +'"]'); |
| 39 var newScript = document.createElement('script'); |
| 40 // Load it from the right place. |
| 41 var replacement = 'webcomponents-' + polyfills.join('-') + '.js'; |
| 42 var url = script.src.replace(name, replacement); |
| 43 newScript.src = url; |
| 44 // NOTE: this is required to ensure the polyfills are loaded before |
| 45 // *native* html imports load on older Chrome versions. This *is* CSP |
| 46 // compliant since CSP rules must have allowed this script to run. |
| 47 // In all other cases, this can be async. |
| 48 if (document.readyState === 'loading' && ('import' in document.createElement
('link'))) { |
| 49 document.write(newScript.outerHTML); |
| 50 } else { |
| 51 document.head.appendChild(newScript); |
| 52 } |
| 53 } else { |
| 54 // Ensure `WebComponentsReady` is fired also when there are no polyfills loa
ded. |
| 55 // however, we have to wait for the document to be in 'interactive' state, |
| 56 // otherwise a rAF may fire before scripts in <body> |
| 57 |
| 58 var fire = function() { |
| 59 requestAnimationFrame(function() { |
| 60 window.WebComponents.ready = true; |
| 61 document.dispatchEvent(new CustomEvent('WebComponentsReady', {bubbles: t
rue})); |
| 62 }); |
| 63 }; |
| 64 |
| 65 if (document.readyState !== 'loading') { |
| 66 fire(); |
| 67 } else { |
| 68 document.addEventListener('readystatechange', function wait() { |
| 69 fire(); |
| 70 document.removeEventListener('readystatechange', wait); |
| 71 }); |
| 72 } |
| 73 } |
| 74 })(); |
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Chromium Code Reviews
Issue 2923973003:
Added base template for config ui. (Closed)
