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/*!

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* jQuery hashchange event - v1.3 - 7/21/2010

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* http://benalman.com/projects/jquery-hashchange-plugin/

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* Dual licensed under the MIT and GPL licenses.

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* http://benalman.com/about/license/

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// Script: jQuery hashchange event

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// *Version: 1.3, Last updated: 7/21/2010*

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// Project Home - http://benalman.com/projects/jquery-hashchange-plugin/

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// GitHub - http://github.com/cowboy/jquery-hashchange/

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// Source - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.js

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// (Minified) - http://github.com/cowboy/jquery-hashchange/raw/master/jquery.ba-hashchange.min.js (0.8kb gzipped)

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// About: License

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// Dual licensed under the MIT and GPL licenses.

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// http://benalman.com/about/license/

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// About: Examples

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// These working examples, complete with fully commented code, illustrate a few

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// ways in which this plugin can be used.

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// hashchange event - http://benalman.com/code/projects/jquery-hashchange/examples/hashchange/

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// document.domain - http://benalman.com/code/projects/jquery-hashchange/examples/document_domain/

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// About: Support and Testing

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// Information about what version or versions of jQuery this plugin has been

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// tested with, what browsers it has been tested in, and where the unit tests

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// reside (so you can test it yourself).

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// jQuery Versions - 1.2.6, 1.3.2, 1.4.1, 1.4.2

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// Browsers Tested - Internet Explorer 6-8, Firefox 2-4, Chrome 5-6, Safari 3.2-5,

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// Opera 9.6-10.60, iPhone 3.1, Android 1.6-2.2, BlackBerry 4.6-5.

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// Unit Tests - http://benalman.com/code/projects/jquery-hashchange/unit/

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// About: Known issues

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// While this jQuery hashchange event implementation is quite stable and

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// robust, there are a few unfortunate browser bugs surrounding expected

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// hashchange event-based behaviors, independent of any JavaScript

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// window.onhashchange abstraction. See the following examples for more

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// information:

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// Chrome: Back Button - http://benalman.com/code/projects/jquery-hashchange/examples/bug-chrome-back-button/

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// Firefox: Remote XMLHttpRequest - http://benalman.com/code/projects/jquery-hashchange/examples/bug-firefox-remote-xhr/

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// WebKit: Back Button in an Iframe - http://benalman.com/code/projects/jquery-hashchange/examples/bug-webkit-hash-iframe/

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// Safari: Back Button from a different domain - http://benalman.com/code/projects/jquery-hashchange/examples/bug-safari-back-from-diff-domain/

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// Also note that should a browser natively support the window.onhashchange

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// event, but not report that it does, the fallback polling loop will be used.

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// About: Release History

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// 1.3 - (7/21/2010) Reorganized IE6/7 Iframe code to make it more

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// "removable" for mobile-only development. Added IE6/7 document.title

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// support. Attempted to make Iframe as hidden as possible by using

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// techniques from http://www.paciellogroup.com/blog/?p=604. Added

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// support for the "shortcut" format $(window).hashchange( fn ) and

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// $(window).hashchange() like jQuery provides for built-in events.

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// Renamed jQuery.hashchangeDelay to <jQuery.fn.hashchange.delay> and

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// lowered its default value to 50. Added <jQuery.fn.hashchange.domain>

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// and <jQuery.fn.hashchange.src> properties plus document-domain.html

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// file to address access denied issues when setting document.domain in

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// IE6/7.

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// 1.2 - (2/11/2010) Fixed a bug where coming back to a page using this plugin

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// from a page on another domain would cause an error in Safari 4. Also,

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// IE6/7 Iframe is now inserted after the body (this actually works),

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// which prevents the page from scrolling when the event is first bound.

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// Event can also now be bound before DOM ready, but it won't be usable

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// before then in IE6/7.

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// 1.1 - (1/21/2010) Incorporated document.documentMode test to fix IE8 bug

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// where browser version is incorrectly reported as 8.0, despite

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// inclusion of the X-UA-Compatible IE=EmulateIE7 meta tag.

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// 1.0 - (1/9/2010) Initial Release. Broke out the jQuery BBQ event.special

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// window.onhashchange functionality into a separate plugin for users

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// who want just the basic event & back button support, without all the

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// extra awesomeness that BBQ provides. This plugin will be included as

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// part of jQuery BBQ, but also be available separately.

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(function($,window,undefined){

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'$:nomunge'; // Used by YUI compressor.

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// Reused string.

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var str_hashchange = 'hashchange',

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// Method / object references.

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doc = document,

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fake_onhashchange,

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special = $.event.special,

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// Does the browser support window.onhashchange? Note that IE8 running in

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// IE7 compatibility mode reports true for 'onhashchange' in window, even

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// though the event isn't supported, so also test document.documentMode.

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doc_mode = doc.documentMode,

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supports_onhashchange = 'on' + str_hashchange in window && ( doc_mode === undefined || doc_mode > 7 );

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// Get location.hash (or what you'd expect location.hash to be) sans any

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// leading #. Thanks for making this necessary, Firefox!

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function get_fragment( url ) {

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url = url || location.href;

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return '#' + url.replace( /^[^#]*#?(.*)$/, '$1' );

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};

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// Method: jQuery.fn.hashchange

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// Bind a handler to the window.onhashchange event or trigger all bound

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// window.onhashchange event handlers. This behavior is consistent with

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// jQuery's built-in event handlers.

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// Usage:

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// > jQuery(window).hashchange( [ handler ] );

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// Arguments:

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// handler - (Function) Optional handler to be bound to the hashchange

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// event. This is a "shortcut" for the more verbose form:

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// jQuery(window).bind( 'hashchange', handler ). If handler is omitted,

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// all bound window.onhashchange event handlers will be triggered. This

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// is a shortcut for the more verbose

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// jQuery(window).trigger( 'hashchange' ). These forms are described in

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// the <hashchange event> section.

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// Returns:

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// (jQuery) The initial jQuery collection of elements.

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// Allow the "shortcut" format $(elem).hashchange( fn ) for binding and

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// $(elem).hashchange() for triggering, like jQuery does for built-in events.

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$.fn[ str_hashchange ] = function( fn ) {

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return fn ? this.bind( str_hashchange, fn ) : this.trigger( str_hashchange );

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};

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// Property: jQuery.fn.hashchange.delay

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// The numeric interval (in milliseconds) at which the <hashchange event>

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// polling loop executes. Defaults to 50.

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// Property: jQuery.fn.hashchange.domain

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// If you're setting document.domain in your JavaScript, and you want hash

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// history to work in IE6/7, not only must this property be set, but you must

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// also set document.domain BEFORE jQuery is loaded into the page. This

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// property is only applicable if you are supporting IE6/7 (or IE8 operating

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// in "IE7 compatibility" mode).

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// In addition, the <jQuery.fn.hashchange.src> property must be set to the

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// path of the included "document-domain.html" file, which can be renamed or

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// modified if necessary (note that the document.domain specified must be the

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// same in both your main JavaScript as well as in this file).

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// Usage:

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// jQuery.fn.hashchange.domain = document.domain;

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// Property: jQuery.fn.hashchange.src

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// If, for some reason, you need to specify an Iframe src file (for example,

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// when setting document.domain as in <jQuery.fn.hashchange.domain>), you can

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// do so using this property. Note that when using this property, history

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// won't be recorded in IE6/7 until the Iframe src file loads. This property

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// is only applicable if you are supporting IE6/7 (or IE8 operating in "IE7

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// compatibility" mode).

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// Usage:

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// jQuery.fn.hashchange.src = 'path/to/file.html';

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$.fn[ str_hashchange ].delay = 50;

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$.fn[ str_hashchange ].domain = null;

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$.fn[ str_hashchange ].src = null;

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// Event: hashchange event

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// Fired when location.hash changes. In browsers that support it, the native

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// HTML5 window.onhashchange event is used, otherwise a polling loop is

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// initialized, running every <jQuery.fn.hashchange.delay> milliseconds to

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// see if the hash has changed. In IE6/7 (and IE8 operating in "IE7

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// compatibility" mode), a hidden Iframe is created to allow the back button

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// and hash-based history to work.

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// Usage as described in <jQuery.fn.hashchange>:

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// > // Bind an event handler.

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// > jQuery(window).hashchange( function(e) {

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// > var hash = location.hash;

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// > ...

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// > });

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// >

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// > // Manually trigger the event handler.

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// > jQuery(window).hashchange();

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// A more verbose usage that allows for event namespacing:

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// > // Bind an event handler.

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// > jQuery(window).bind( 'hashchange', function(e) {

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// > var hash = location.hash;

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// > ...

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// > });

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// >

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// > // Manually trigger the event handler.

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// > jQuery(window).trigger( 'hashchange' );

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// Additional Notes:

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// * The polling loop and Iframe are not created until at least one handler

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// is actually bound to the 'hashchange' event.

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// * If you need the bound handler(s) to execute immediately, in cases where

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// a location.hash exists on page load, via bookmark or page refresh for

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// example, use jQuery(window).hashchange() or the more verbose

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// jQuery(window).trigger( 'hashchange' ).

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// * The event can be bound before DOM ready, but since it won't be usable

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// before then in IE6/7 (due to the necessary Iframe), recommended usage is

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// to bind it inside a DOM ready handler.

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// Override existing $.event.special.hashchange methods (allowing this plugin

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// to be defined after jQuery BBQ in BBQ's source code).

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special[ str_hashchange ] = $.extend( special[ str_hashchange ], {

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// Called only when the first 'hashchange' event is bound to window.

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setup: function() {

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// If window.onhashchange is supported natively, there's nothing to do..

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if ( supports_onhashchange ) { return false; }

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// Otherwise, we need to create our own. And we don't want to call this

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// until the user binds to the event, just in case they never do, since it

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// will create a polling loop and possibly even a hidden Iframe.

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$( fake_onhashchange.start );

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// Called only when the last 'hashchange' event is unbound from window.

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teardown: function() {

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// If window.onhashchange is supported natively, there's nothing to do..

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if ( supports_onhashchange ) { return false; }

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// Otherwise, we need to stop ours (if possible).

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$( fake_onhashchange.stop );

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}

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});

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// fake_onhashchange does all the work of triggering the window.onhashchange

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// event for browsers that don't natively support it, including creating a

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// polling loop to watch for hash changes and in IE 6/7 creating a hidden

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// Iframe to enable back and forward.

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fake_onhashchange = (function(){

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var self = {},

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timeout_id,

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// Remember the initial hash so it doesn't get triggered immediately.

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last_hash = get_fragment(),

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fn_retval = function(val){ return val; },

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history_set = fn_retval,

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history_get = fn_retval;

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// Start the polling loop.

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self.start = function() {

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timeout_id || poll();

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};

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// Stop the polling loop.

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self.stop = function() {

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timeout_id && clearTimeout( timeout_id );

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timeout_id = undefined;

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};

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// This polling loop checks every $.fn.hashchange.delay milliseconds to see

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// if location.hash has changed, and triggers the 'hashchange' event on

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// window when necessary.

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function poll() {

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var hash = get_fragment(),

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history_hash = history_get( last_hash );

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if ( hash !== last_hash ) {

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history_set( last_hash = hash, history_hash );

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$(window).trigger( str_hashchange );

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} else if ( history_hash !== last_hash ) {

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location.href = location.href.replace( /#.*/, '' ) + history_hash;

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}

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timeout_id = setTimeout( poll, $.fn[ str_hashchange ].delay );

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};

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// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

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// vvvvvvvvvvvvvvvvvvv REMOVE IF NOT SUPPORTING IE6/7/8 vvvvvvvvvvvvvvvvvvv

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// vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv

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typeof $.browser !== 'undefined' && $.browser.msie && !supports_onhashchange && (function(){

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// Not only do IE6/7 need the "magical" Iframe treatment, but so does IE8

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// when running in "IE7 compatibility" mode.

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var iframe,

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iframe_src;

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// When the event is bound and polling starts in IE 6/7, create a hidden

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// Iframe for history handling.

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self.start = function(){

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if ( !iframe ) {

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iframe_src = $.fn[ str_hashchange ].src;

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iframe_src = iframe_src && iframe_src + get_fragment();

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// Create hidden Iframe. Attempt to make Iframe as hidden as possible

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// by using techniques from http://www.paciellogroup.com/blog/?p=604.

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iframe = $('<iframe tabindex="-1" title="empty"/>').hide()

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// When Iframe has completely loaded, initialize the history and

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// start polling.

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.one( 'load', function(){

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iframe_src || history_set( get_fragment() );

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poll();

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})

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// Load Iframe src if specified, otherwise nothing.

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.attr( 'src', iframe_src || 'javascript:0' )

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// Append Iframe after the end of the body to prevent unnecessary

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// initial page scrolling (yes, this works).

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.insertAfter( 'body' )[0].contentWindow;

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// Whenever `document.title` changes, update the Iframe's title to

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// prettify the back/next history menu entries. Since IE sometimes

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// errors with "Unspecified error" the very first time this is set

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// (yes, very useful) wrap this with a try/catch block.

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doc.onpropertychange = function(){

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try {

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if ( event.propertyName === 'title' ) {

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iframe.document.title = doc.title;

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}

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} catch(e) {}

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};

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}

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};

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// Override the "stop" method since an IE6/7 Iframe was created. Even

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// if there are no longer any bound event handlers, the polling loop

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// is still necessary for back/next to work at all!

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self.stop = fn_retval;

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// Get history by looking at the hidden Iframe's location.hash.

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history_get = function() {

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return get_fragment( iframe.location.href );

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};

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// Set a new history item by opening and then closing the Iframe

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// document, *then* setting its location.hash. If document.domain has

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// been set, update that as well.

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history_set = function( hash, history_hash ) {

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var iframe_doc = iframe.document,

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domain = $.fn[ str_hashchange ].domain;

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if ( hash !== history_hash ) {

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// Update Iframe with any initial `document.title` that might be set.

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iframe_doc.title = doc.title;

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// Opening the Iframe's document after it has been closed is what

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// actually adds a history entry.

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iframe_doc.open();

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// Set document.domain for the Iframe document as well, if necessary.

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domain && iframe_doc.write( '<script>document.domain="' + domain + '"</script>' );

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iframe_doc.close();

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// Update the Iframe's hash, for great justice.

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iframe.location.hash = hash;

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}

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};

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})();

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// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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// ^^^^^^^^^^^^^^^^^^^ REMOVE IF NOT SUPPORTING IE6/7/8 ^^^^^^^^^^^^^^^^^^^

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// ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

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return self;

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})();

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})(jQuery,this);

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