ios/web/web_state/js/resources/message_dynamic_ui.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 // Scripts for the message handler for use with UIWebView.
   6
   7 goog.provide('__crWeb.messageDynamic');
   8
   9 goog.require('__crWeb.common');
  10
  11 /**
  12  * Namespace for this module.
  13  */
  14 __gCrWeb.message_dynamic = {};
  15
  16 /* Beginning of anonymous object. */
  17 (function() {
  18   /**
  19    * Returns true if sending the message queue should be delayed.
  20    */
  21   function pageRequiresDelayedSend() {
  22     // The Apple mobile password recovery page does not interact well with
  23     // iframes, so on pages with the 'iforgot.apple.com' domain, delay sending
  24     // the queue.
  25     return window.location.origin === "https://iforgot.apple.com";
  26   }
  27
  28   /**
  29    * Sends queued commands to the Objective-C side.
  30    * @param {Object} queueObject Queue object containing messages to send.
  31    */
  32   __gCrWeb.message_dynamic.sendQueue = function(queueObject) {
  33     var send = function() {
  34       // The technique requires the document to be present. If it is not, the
  35       // messages will be sent once the document object is created.
  36       if (!document || !document.body) {
  37         // This happens in rare occasions early in the page cycle. It is
  38         // possible to create a body element indirectly here, but it has side
  39         // effects such as blocking page redirection. The safest solution is to
  40         // try again in 1/10th of a second.
  41         window.setTimeout(__gCrWeb.message.invokeQueues, 100);
  42         return;
  43       }
  44
  45       var frame = document.createElement('iframe');
  46       frame.style.display = 'none';
  47       frame.src = queueObject.scheme + '://' + __gCrWeb.windowId + '#' +
  48           encodeURIComponent(__gCrWeb.common.JSONStringify(queueObject.queue));
  49       queueObject.reset();
  50       document.body.appendChild(frame);
  51       document.body.removeChild(frame);
  52     };
  53
  54     // Some pages do not interact well with iframes. On those pages, delay
  55     // sending the queue.
  56     if (pageRequiresDelayedSend()) {
  57       window.requestAnimationFrame(send);
  58     } else {
  59       send();
  60     }
  61   };
  62 }());