chrome/browser/resources/help/help.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 <include src="../uber/uber_page_manager_observer.js">
   6 <include src="../uber/uber_utils.js">
   7
   8 (function() {
   9   var HelpPage = help.HelpPage;
  10   var PageManager = cr.ui.pageManager.PageManager;
  11
  12   /**
  13    * DOMContentLoaded handler, sets up the page.
  14    */
  15   function load() {
  16     PageManager.register(HelpPage.getInstance());
  17
  18     if (help.ChannelChangePage) {
  19       PageManager.registerOverlay(help.ChannelChangePage.getInstance(),
  20                                   HelpPage.getInstance());
  21     }
  22     PageManager.addObserver(new uber.PageManagerObserver());
  23     PageManager.initialize(HelpPage.getInstance());
  24     uber.onContentFrameLoaded();
  25
  26     var pageName = PageManager.getPageNameFromPath();
  27     // Still update history so that chrome://help/nonexistant redirects
  28     // appropriately to chrome://help/. If the URL matches, updateHistory
  29     // will avoid adding the extra state.
  30     var updateHistory = true;
  31     PageManager.showPageByName(pageName, updateHistory, {replaceState: true});
  32   }
  33
  34   document.addEventListener('DOMContentLoaded', load);
  35
  36   /**
  37    * Listener for the |beforeunload| event.
  38    */
  39   window.onbeforeunload = function() {
  40     PageManager.willClose();
  41   };
  42
  43   /**
  44    * Listener for the |popstate| event.
  45    * @param {Event} e The |popstate| event.
  46    */
  47   window.onpopstate = function(e) {
  48     var pageName = PageManager.getPageNameFromPath();
  49     PageManager.setState(pageName, location.hash, e.state);
  50   };
  51 })();