chrome/renderer/resources/extensions/web_view_deny.js

   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     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.enteredDocumentCallback;
  27   delete proto.leftDocumentCallback;
  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);