| /* |
| * Copyright 2012 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /** |
| * @fileoverview Contains helper functions which will be needed by DeferIframe |
| * filter. |
| * |
| * @author pulkitg@google.com (Pulkit Goyal) |
| */ |
| |
| // Exporting functions using quoted attributes to prevent js compiler from |
| // renaming them. |
| // See http://code.google.com/closure/compiler/docs/api-tutorial3.html#dangers |
| window['pagespeed'] = window['pagespeed'] || {}; |
| var pagespeed = window['pagespeed']; |
| |
| /** |
| * @constructor |
| */ |
| pagespeed.DeferIframe = function() { |
| }; |
| |
| /** |
| * Convert first pagespeed_iframe element in the page to iframe. |
| */ |
| pagespeed.DeferIframe.prototype.convertToIframe = function() { |
| var nodes = document.getElementsByTagName('pagespeed_iframe'); |
| if (nodes.length > 0) { |
| var oldElement = nodes[0]; |
| var newElement = document.createElement('iframe'); |
| // Copy attributes. |
| for (var i = 0, a = oldElement.attributes, n = a.length; i < n; ++i) { |
| newElement.setAttribute(a[i].name, a[i].value); |
| } |
| // Replace the old element with the new one. |
| oldElement.parentNode.replaceChild(newElement, oldElement); |
| } |
| }; |
| pagespeed.DeferIframe.prototype['convertToIframe'] = |
| pagespeed.DeferIframe.prototype.convertToIframe; |
| |
| /** |
| * Initializes the defer iframe module. |
| */ |
| pagespeed.deferIframeInit = function() { |
| var deferIframe = new pagespeed.DeferIframe(); |
| pagespeed['deferIframe'] = deferIframe; |
| }; |
| pagespeed['deferIframeInit'] = pagespeed.deferIframeInit; |