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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 var DocumentNatives = requireNative('document_natives'); | |
6 | |
7 // Output error message to console when using the <webview> tag with no | |
8 // permission. | |
9 var errorMessage = "You do not have permission to use the webview element." + | |
10 " Be sure to declare the 'webview' permission in your manifest file."; | |
11 | |
12 // Registers <webview> custom element. | |
13 function registerWebViewElement() { | |
14 var proto = Object.create(HTMLElement.prototype); | |
15 | |
16 proto.createdCallback = function() { | |
17 window.console.error(errorMessage); | |
18 }; | |
19 | |
20 window.WebView = | |
21 DocumentNatives.RegisterElement('webview', {prototype: proto}); | |
22 | |
23 // Delete the callbacks so developers cannot call them and produce unexpected | |
24 // behavior. | |
25 delete proto.createdCallback; | |
26 delete proto.attachedCallback; | |
27 delete proto.detachedCallback; | |
28 delete proto.attributeChangedCallback; | |
29 } | |
30 | |
31 var useCapture = true; | |
32 window.addEventListener('readystatechange', function listener(event) { | |
33 if (document.readyState == 'loading') | |
34 return; | |
35 | |
36 registerWebViewElement(); | |
37 window.removeEventListener(event.type, listener, useCapture); | |
38 }, useCapture); | |
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