/**
 * jQuery hashchange 1.0.0
 * 
 * (based on jquery.history)
 *
 * Copyright (c) 2008 Chris Leishman (chrisleishman.com)
 * Dual licensed under the MIT (MIT-LICENSE.txt)
 * and GPL (GPL-LICENSE.txt) licenses.
 */
(function ($) {
    $.fn.extend({
        hashchange: function (callback) { this.bind('hashchange', callback) },
        openOnClick: function (href) {
            if (href === undefined || href.length == 0)
                href = '#';
            return this.click(function (ev) {
                if (href && href.charAt(0) == '#') {
                    // execute load in separate call stack
                    window.setTimeout(function () { $.locationHash(href) }, 0);
                } else {
                    window.location(href);
                }
                ev.stopPropagation();
                return false;
            });
        }
    });

    // IE 8 introduces the hashchange event natively - so nothing more to do
    if ($.browser.msie && document.documentMode && document.documentMode >= 8) {
        $.extend({
            locationHash: function (hash) {
                if (!hash) hash = '#';
                else if (hash.charAt(0) != '#') hash = '#' + hash;
                location.hash = hash;
            }
        });
        return;
    }

    var curHash;
    // hidden iframe for IE (earlier than 8)
    var iframe;

    $.extend({
        locationHash: function (hash) {
            if (curHash === undefined) return;

            if (!hash) hash = '#';
            else if (hash.charAt(0) != '#') hash = '#' + hash;

            location.hash = hash;

            if (curHash == hash) return;
            curHash = hash;

            if ($.browser.msie) updateIEFrame(hash);
            $.event.trigger('hashchange');
        }
    });

    $(document).ready(function () {
        curHash = location.hash;
        if ($.browser.msie) {
            // stop the callback firing twice during init if no hash present
            if (curHash == '') curHash = '#';
            // add hidden iframe for IE
            iframe = $('<iframe />').hide().get(0);
            $('body').prepend(iframe);
            updateIEFrame(location.hash);
            setInterval(checkHashIE, 100);
        } else {
            setInterval(checkHash, 100);
        }
    });
    $(window).unload(function () { iframe = null });

    function checkHash() {
        var hash = location.hash;
        if (hash != curHash) {
            curHash = hash;
            $.event.trigger('hashchange');
        }
    }

    /* We dont need this in the Rapide project AjaxLink handels it by it self
    if ($.browser.msie) {
    // Attach a live handler for any anchor links
    $('a[href^=#]').live('click', function() {alert(1);
    var hash = $(this).attr('href');
    // Don't intercept the click if there is an existing anchor on the page
    // that matches this hash
    if ($(hash).length == 0 && $('a[name='+hash.slice(1)+']').length == 0) {
    $.locationHash(hash);
    return false;
    }
    });
    }
    */

    function checkHashIE() {
        // On IE, check for location.hash of iframe
        var idoc = iframe.contentDocument || iframe.contentWindow.document;
        var hash = idoc.location.hash;
        if (hash == '') hash = '#';

        if (hash != curHash) {
            if (location.hash != hash) location.hash = hash;
            curHash = hash;
            $.event.trigger('hashchange');
        }
    }

    function updateIEFrame(hash) {
        if (hash == '#') hash = '';
        var idoc = iframe.contentWindow.document;
        idoc.open();
        idoc.close();
        if (idoc.location.hash != hash) idoc.location.hash = hash;
    }

})(jQuery);