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YUI.add('history-hash-ie', function (Y, NAME) {
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/**
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* Improves IE6/7 support in history-hash by using a hidden iframe to create
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* entries in IE's browser history. This module is only needed if IE6/7 support
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* is necessary; it's not needed for any other browser.
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*
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* @module history
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* @submodule history-hash-ie
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* @since 3.2.0
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*/
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// Combination of a UA sniff to ensure this is IE (or a browser that wants us to
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// treat it like IE) and feature detection for native hashchange support (false
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// for IE < 8 or IE8/9 in IE7 mode).
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if (Y.UA.ie && !Y.HistoryBase.nativeHashChange) {
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var Do = Y.Do,
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GlobalEnv = YUI.namespace('Env.HistoryHash'),
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HistoryHash = Y.HistoryHash,
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iframe = GlobalEnv._iframe,
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win = Y.config.win;
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/**
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* Gets the raw (not decoded) current location hash from the IE iframe,
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* minus the preceding '#' character and the hashPrefix (if one is set).
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*
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* @method getIframeHash
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* @return {String} current iframe hash
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* @static
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*/
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HistoryHash.getIframeHash = function () {
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if (!iframe || !iframe.contentWindow) {
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return '';
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}
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var prefix = HistoryHash.hashPrefix,
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hash = iframe.contentWindow.location.hash.substr(1);
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return prefix && hash.indexOf(prefix) === 0 ?
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hash.replace(prefix, '') : hash;
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};
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/**
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* Updates the history iframe with the specified hash.
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*
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* @method _updateIframe
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* @param {String} hash location hash
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* @param {Boolean} replace (optional) if <code>true</code>, the current
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* history state will be replaced without adding a new history entry
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* @protected
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* @static
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* @for HistoryHash
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*/
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HistoryHash._updateIframe = function (hash, replace) {
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var iframeDoc = iframe && iframe.contentWindow && iframe.contentWindow.document,
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iframeLocation = iframeDoc && iframeDoc.location;
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if (!iframeDoc || !iframeLocation) {
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return;
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}
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if (replace) {
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iframeLocation.replace(hash.charAt(0) === '#' ? hash : '#' + hash);
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} else {
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iframeDoc.open().close();
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iframeLocation.hash = hash;
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}
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};
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Do.before(HistoryHash._updateIframe, HistoryHash, 'replaceHash', HistoryHash, true);
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if (!iframe) {
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Y.on('domready', function () {
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var lastUrlHash = HistoryHash.getHash();
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// Create a hidden iframe to store history state, following the
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// iframe-hiding recommendations from
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// http://www.paciellogroup.com/blog/?p=604.
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//
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// This iframe will allow history navigation within the current page
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// context. After navigating to another page, all but the most
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// recent history state will be lost.
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//
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// Earlier versions of the YUI History Utility attempted to work
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// around this limitation by having the iframe load a static
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// resource. This workaround was extremely fragile and tended to
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// break frequently (and silently) since it was entirely dependent
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// on IE's inconsistent handling of iframe history.
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//
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// Since this workaround didn't work much of the time anyway and
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// added significant complexity, it has been removed, and IE6 and 7
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// now get slightly degraded history support.
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iframe = GlobalEnv._iframe = Y.Node.getDOMNode(Y.Node.create(
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'<iframe src="javascript:0" style="display:none" height="0" width="0" tabindex="-1" title="empty"/>'
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));
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// Append the iframe to the documentElement rather than the body.
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// Keeping it outside the body prevents scrolling on the initial
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// page load (hat tip to Ben Alman and jQuery BBQ for this
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// technique).
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Y.config.doc.documentElement.appendChild(iframe);
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// Update the iframe with the initial location hash, if any. This
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// will create an initial history entry that the user can return to
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// after the state has changed.
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HistoryHash._updateIframe(lastUrlHash || '#');
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// Listen for hashchange events and keep the iframe's hash in sync
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// with the parent frame's hash.
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Y.on('hashchange', function (e) {
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lastUrlHash = e.newHash;
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if (HistoryHash.getIframeHash() !== lastUrlHash) {
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HistoryHash._updateIframe(lastUrlHash);
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}
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}, win);
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// Watch the iframe hash in order to detect back/forward navigation.
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Y.later(50, null, function () {
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var iframeHash = HistoryHash.getIframeHash();
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if (iframeHash !== lastUrlHash) {
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HistoryHash.setHash(iframeHash);
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}
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}, null, true);
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});
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}
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}
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}, '3.18.1', {"requires": ["history-hash", "node-base"]});
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