chrome/test/ispy/client/dom.py

   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
   6 def GetScriptToWaitForUnchangingDOM():
   7   """Gets Javascript that waits until the DOM is stable for 5 seconds.
   8
   9   Times out if the DOM is not stable within 30 seconds.
  10
  11   Returns:
  12     Javascript as a string.
  13   """
  14   return """
  15     var target = document.body;
  16     var callback = arguments[arguments.length - 1]
  17
  18     var timeout_id = setTimeout(function() {
  19       callback()
  20     }, 5000);
  21
  22     var observer = new MutationObserver(function(mutations) {
  23       clearTimeout(timeout_id);
  24       timeout_id = setTimeout(function() {
  25         callback();
  26       }, 5000);
  27     }).observe(target, {attributes: true, childList: true,
  28       characterData: true, subtree: true});
  29   """