src/chrome/test/data/prerender/prerender_events_common.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 // Common js for prerender loaders; defines the helper functions that put
   6 // event handlers on prerenders and track the events for browser tests.
   7
   8 // TODO(gavinp): Put more common loader logic in here.
   9
  10 // Currently only errors with the ordering of Prerender events are caught.
  11 var hadPrerenderEventErrors = false;
  12
  13 var receivedPrerenderStartEvents = [];
  14 var receivedPrerenderLoadEvents = [];
  15 var receivedPrerenderStopEvents = [];
  16
  17 function PrerenderStartHandler(index) {
  18   if (receivedPrerenderStartEvents[index] ||
  19       receivedPrerenderLoadEvents[index] ||
  20       receivedPrerenderStopEvents[index]) {
  21     hadPrerenderEventErrors = true;
  22     return;
  23   }
  24   receivedPrerenderStartEvents[index] = true;
  25 }
  26
  27 function PrerenderLoadHandler(index) {
  28   if (!receivedPrerenderStartEvents[index] ||
  29       receivedPrerenderStopEvents[index]) {
  30     hadPrerenderEventErrors = true;
  31     return;
  32   }
  33   if (!receivedPrerenderLoadEvents[index])
  34     receivedPrerenderLoadEvents[index] = 0;
  35   receivedPrerenderLoadEvents[index]++;
  36 }
  37
  38 function PrerenderStopHandler(index) {
  39   if (!receivedPrerenderStartEvents[index] ||
  40       receivedPrerenderStopEvents[index]) {
  41     hadPrerenderEventErrors = true;
  42     return;
  43   }
  44   receivedPrerenderStopEvents[index] = true;
  45 }
  46
  47 function AddEventHandlersToLinkElement(link, index) {
  48   link.addEventListener('webkitprerenderstart',
  49                         PrerenderStartHandler.bind(null, index), false);
  50   link.addEventListener('webkitprerenderload',
  51                         PrerenderLoadHandler.bind(null, index), false);
  52   link.addEventListener('webkitprerenderstop',
  53                         PrerenderStopHandler.bind(null, index), false);
  54 }