2 YUI 3.13.0 (build 508226d)
3 Copyright 2013 Yahoo! Inc. All rights reserved.
4 Licensed under the BSD License.
5 http://yuilibrary.com/license/
8 YUI.add('history-hash-ie', function (Y, NAME) {
11 * Improves IE6/7 support in history-hash by using a hidden iframe to create
12 * entries in IE's browser history. This module is only needed if IE6/7 support
13 * is necessary; it's not needed for any other browser.
16 * @submodule history-hash-ie
20 // Combination of a UA sniff to ensure this is IE (or a browser that wants us to
21 // treat it like IE) and feature detection for native hashchange support (false
22 // for IE < 8 or IE8/9 in IE7 mode).
23 if (Y.UA.ie && !Y.HistoryBase.nativeHashChange) {
25 GlobalEnv = YUI.namespace('Env.HistoryHash'),
26 HistoryHash = Y.HistoryHash,
28 iframe = GlobalEnv._iframe,
32 * Gets the raw (not decoded) current location hash from the IE iframe,
33 * minus the preceding '#' character and the hashPrefix (if one is set).
35 * @method getIframeHash
36 * @return {String} current iframe hash
39 HistoryHash.getIframeHash = function () {
40 if (!iframe || !iframe.contentWindow) {
44 var prefix = HistoryHash.hashPrefix,
45 hash = iframe.contentWindow.location.hash.substr(1);
47 return prefix && hash.indexOf(prefix) === 0 ?
48 hash.replace(prefix, '') : hash;
52 * Updates the history iframe with the specified hash.
54 * @method _updateIframe
55 * @param {String} hash location hash
56 * @param {Boolean} replace (optional) if <code>true</code>, the current
57 * history state will be replaced without adding a new history entry
62 HistoryHash._updateIframe = function (hash, replace) {
63 var iframeDoc = iframe && iframe.contentWindow && iframe.contentWindow.document,
64 iframeLocation = iframeDoc && iframeDoc.location;
66 if (!iframeDoc || !iframeLocation) {
72 iframeLocation.replace(hash.charAt(0) === '#' ? hash : '#' + hash);
74 iframeDoc.open().close();
75 iframeLocation.hash = hash;
79 Do.before(HistoryHash._updateIframe, HistoryHash, 'replaceHash', HistoryHash, true);
82 Y.on('domready', function () {
83 var lastUrlHash = HistoryHash.getHash();
85 // Create a hidden iframe to store history state, following the
86 // iframe-hiding recommendations from
87 // http://www.paciellogroup.com/blog/?p=604.
89 // This iframe will allow history navigation within the current page
90 // context. After navigating to another page, all but the most
91 // recent history state will be lost.
93 // Earlier versions of the YUI History Utility attempted to work
94 // around this limitation by having the iframe load a static
95 // resource. This workaround was extremely fragile and tended to
96 // break frequently (and silently) since it was entirely dependent
97 // on IE's inconsistent handling of iframe history.
99 // Since this workaround didn't work much of the time anyway and
100 // added significant complexity, it has been removed, and IE6 and 7
101 // now get slightly degraded history support.
103 iframe = GlobalEnv._iframe = Y.Node.getDOMNode(Y.Node.create(
104 '<iframe src="javascript:0" style="display:none" height="0" width="0" tabindex="-1" title="empty"/>'
107 // Append the iframe to the documentElement rather than the body.
108 // Keeping it outside the body prevents scrolling on the initial
109 // page load (hat tip to Ben Alman and jQuery BBQ for this
111 Y.config.doc.documentElement.appendChild(iframe);
113 // Update the iframe with the initial location hash, if any. This
114 // will create an initial history entry that the user can return to
115 // after the state has changed.
116 HistoryHash._updateIframe(lastUrlHash || '#');
118 // Listen for hashchange events and keep the iframe's hash in sync
119 // with the parent frame's hash.
120 Y.on('hashchange', function (e) {
121 lastUrlHash = e.newHash;
123 if (HistoryHash.getIframeHash() !== lastUrlHash) {
124 HistoryHash._updateIframe(lastUrlHash);
128 // Watch the iframe hash in order to detect back/forward navigation.
129 Y.later(50, null, function () {
130 var iframeHash = HistoryHash.getIframeHash();
132 if (iframeHash !== lastUrlHash) {
133 HistoryHash.setHash(iframeHash);
141 }, '3.13.0', {"requires": ["history-hash", "node-base"]});