happstack-yui-7373.5.2: bundle/history-hash-ie/history-hash-ie-coverage.js
/*
YUI 3.7.3 (build 5687)
Copyright 2012 Yahoo! Inc. All rights reserved.
Licensed under the BSD License.
http://yuilibrary.com/license/
*/
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YUI.add('history-hash-ie', function (Y, NAME) {
/**
* Improves IE6/7 support in history-hash by using a hidden iframe to create
* entries in IE's browser history. This module is only needed if IE6/7 support
* is necessary; it's not needed for any other browser.
*
* @module history
* @submodule history-hash-ie
* @since 3.2.0
*/
// Combination of a UA sniff to ensure this is IE (or a browser that wants us to
// treat it like IE) and feature detection for native hashchange support (false
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if (Y.UA.ie && !Y.HistoryBase.nativeHashChange) {
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var Do = Y.Do,
GlobalEnv = YUI.namespace('Env.HistoryHash'),
HistoryHash = Y.HistoryHash,
iframe = GlobalEnv._iframe,
win = Y.config.win;
/**
* Gets the raw (not decoded) current location hash from the IE iframe,
* minus the preceding '#' character and the hashPrefix (if one is set).
*
* @method getIframeHash
* @return {String} current iframe hash
* @static
*/
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HistoryHash.getIframeHash = function () {
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if (!iframe || !iframe.contentWindow) {
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return '';
}
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var prefix = HistoryHash.hashPrefix,
hash = iframe.contentWindow.location.hash.substr(1);
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return prefix && hash.indexOf(prefix) === 0 ?
hash.replace(prefix, '') : hash;
};
/**
* Updates the history iframe with the specified hash.
*
* @method _updateIframe
* @param {String} hash location hash
* @param {Boolean} replace (optional) if <code>true</code>, the current
* history state will be replaced without adding a new history entry
* @protected
* @static
* @for HistoryHash
*/
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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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var lastUrlHash = HistoryHash.getHash();
// Create a hidden iframe to store history state, following the
// iframe-hiding recommendations from
// http://www.paciellogroup.com/blog/?p=604.
//
// This iframe will allow history navigation within the current page
// context. After navigating to another page, all but the most
// recent history state will be lost.
//
// Earlier versions of the YUI History Utility attempted to work
// around this limitation by having the iframe load a static
// resource. This workaround was extremely fragile and tended to
// break frequently (and silently) since it was entirely dependent
// on IE's inconsistent handling of iframe history.
//
// Since this workaround didn't work much of the time anyway and
// added significant complexity, it has been removed, and IE6 and 7
// now get slightly degraded history support.
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iframe = GlobalEnv._iframe = Y.Node.getDOMNode(Y.Node.create(
'<iframe src="javascript:0" style="display:none" height="0" width="0" tabindex="-1" title="empty"/>'
));
// Append the iframe to the documentElement rather than the body.
// Keeping it outside the body prevents scrolling on the initial
// page load (hat tip to Ben Alman and jQuery BBQ for this
// technique).
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Y.config.doc.documentElement.appendChild(iframe);
// Update the iframe with the initial location hash, if any. This
// will create an initial history entry that the user can return to
// after the state has changed.
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HistoryHash._updateIframe(lastUrlHash || '#');
// Listen for hashchange events and keep the iframe's hash in sync
// 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);
}
}, win);
// 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);
}
}, null, true);
});
}
}
}, '3.7.3', {"requires": ["history-hash", "node-base"]});