/*!
* Copyright (c) 2009-2010 Andreas Blixt <andreas@blixt.org>
* http://github.com/blixt/js-hash
* MIT License: http://www.opensource.org/licenses/mit-license.php
* 
* jQuery hash plugin (Depends on jQuery, Hash)
* Plugin for detecting changes to the hash and for adding history support for
* hashes to certain browsers.
*/
/* A blank HTML page (blank.html) is needed for Internet Explorer 7 and below
* support.
*
* Example:
*     // Add events before calling init to make sure they are triggered for
*     // initial hash value.
*     $('div#log').hashchange(function (e, newHash) {
*         $(this).prepend('<p>New hash: <b>"' + newHash + '"</b></p>');
*     });
*     // Initialize. Here, the src of the iframe is passed in the init
*     // function. If you've got multiple libraries using this plugin, so
*     // the init function is called from them, you can also set the iframe
*     // src in the iframeSrc variable in the beginning of the code in
*     // jquery.hash.js.
*     $.hash.init('blank.html');
*     $.hash.go('abc123');
*     // Changes hash when the anchor is clicked. Also automatically sets the
*     // href attribute to "#def456", unless a second argument with a false
*     // value is supplied.
*     $('a#my-anchor').hash('def456');
* 
* WARNING for Internet Explorer 7 and below:
* If an element on the page has the same ID as the hash used, the history will
* get messed up.
*
* Does not support history in Safari 2 and below.
*/

(function (jQuery, Hash) {
    var 
    // Plugin settings
iframeId = 'jquery-history',
iframeSrc = '/js/blank.html',
eventName = 'hashchange',
eventDataName = 'hash.fn',
init,
    // Import globals
window = this,
documentMode = document.documentMode,

    // Called whenever the hash changes.
callback = function (newHash) {
    jQuery.event.trigger(eventName, [newHash]);
};

    jQuery.hash = {
        init: function (src) {
            // init can only be called once.
            if (init) return;
            init = 1;

            var iframe;
            if (window.ActiveXObject && (!documentMode || documentMode < 8)) {
                // Create an iframe for Internet Explorer 7 and below.
                jQuery('body').prepend(
                '<iframe id="' + iframeId + '" style="display:none;" ' +
                'src="' + (src || iframeSrc) + '"></iframe>');
                iframe = jQuery('#' + iframeId)[0];
            }

            Hash.init(callback, iframe);
        },

        go: Hash.go
    };

    jQuery.fn.hash = function (newHash, changeHref) {
        var fn = this.data(eventDataName);
        if (fn) this.unbind('click', fn);

        if (typeof newHash == 'string') {
            fn = function () { Hash.go(newHash); return false; };
            this.data(eventDataName, fn);
            this.click(fn);
            if (changeHref || changeHref === undefined)
                this.attr('href', '#' + newHash);
        }

        return this;
    };

    jQuery.fn[eventName] = function (fn) {
        return this.bind(eventName, fn);
    };
})(jQuery, Hash);