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1 // Copyright 2014 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 appview element." + | |
10 " Be sure to declare the 'appview' permission in your manifest file and use" + | |
11 " the --enable-app-view command line flag."; | |
12 | |
13 // Registers <webview> custom element. | |
14 function registerAppViewElement() { | |
15 var proto = Object.create(HTMLElement.prototype); | |
16 | |
17 proto.createdCallback = function() { | |
18 window.console.error(errorMessage); | |
19 }; | |
20 | |
21 window.AppView = | |
22 DocumentNatives.RegisterElement('appview', {prototype: proto}); | |
23 | |
24 // Delete the callbacks so developers cannot call them and produce unexpected | |
25 // behavior. | |
26 delete proto.createdCallback; | |
27 delete proto.attachedCallback; | |
28 delete proto.detachedCallback; | |
29 delete proto.attributeChangedCallback; | |
30 } | |
31 | |
32 var useCapture = true; | |
33 window.addEventListener('readystatechange', function listener(event) { | |
34 if (document.readyState == 'loading') | |
35 return; | |
36 | |
37 registerAppViewElement(); | |
38 window.removeEventListener(event.type, listener, useCapture); | |
39 }, useCapture); | |
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