extensions/renderer/resources/guest_view/app_view_deny.js

   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);