/**
 * 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.
 *
 * Modified from original at http://plugins.jquery.com/project/hashchange
 *                      
 * treyk 06/10/2009 - Added in support for change to address bar in IE
 *                    Also removed live binding to a[href] because it's not needed with
 *                    monitoring for address bar changes in IE.
 *
 * History / hashchange plugin that provides history, hashchange event, and bookmarking for
 * DHTML and Ajax applications
 *
 * This plugin provides onhashchange event notification for browsers that don't yet support
 * this HTML 5 standard.  To get notifications for this event, simply use the provide
 * hashchange function:
 * @codestart
 * $(document).ready(function($) {
 *    $(document.body).hashchange(function() {
 *       alert("Got hashchange event: " + location.hash);
 *    });
 * });
 * @codeend
 *
 * This module needs to be initialized. You have the option of firing an initial hash change
 * event after initialization.  To do this, set the $.History.fireInitialChange variable to
 * true BEFORE calling init.  This variable defaults to <b>true</b>.
 * <b>Note:</b> If you want to get an initally change event, you must first bind to the
 * event before calling the init function.
 * @codestart
 * $(document).ready(function($) {
 *    $.History.fireInitialChange = false;  // Set before calling init function.
 *    $.History.init();
 * });
 * @codeend
 *
 *
 *
 *
 *
 *
 *
 */
(function($) {

$.fn.extend({
   hashchange: function(callback) { return 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() { $.History.add(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) {
   $.extend({
      History : {
         fireInitialChange: true,
         init: function() {
            if($.History.fireInitialChange)
               $.event.trigger('hashchange');
         },
         
         add: 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({
   History : {
      fireInitialChange: true,
      init: 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);
            $('body').prepend(iframe);
            updateIEFrame(location.hash);
            setInterval(checkHashIE, 100);
         }
         else if(!$.browser.rhino)
            setInterval(checkHash, 100); //id like this to wait for load
         
         if($.History.fireInitialChange)
            $.event.trigger('hashchange');
      },
     
      add: function(hash) {
         if (curHash === undefined)
            return;

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

         location.hash = hash;
         
         //if (curHash == hash)  let it detect this itself because location.hash might not equal hash
         //   return;
         //curHash = hash;
         
         //if ($.browser.msie)
         //   updateIEFrame(hash);
         
         //$.event.trigger('hashchange');  Removed,
      }
   }
});
/*
$(document).ready(function() {
   $.History.init();
});
*/
$(window).unload(function() { iframe = null });

function checkHash() {
   var hash = location.hash;
   if (hash != curHash) {
      curHash = hash;
      $.event.trigger('hashchange');
   }
}
/*  
function hasNamedAnchor(hash) {
   return ($(hash).length > 0 || $('a[name='+hash.slice(1)+']').length > 0);
}

if ($.browser.msie) {
    // Attach a live handler for any anchor links
//orig    $('a[href^=#]').live('click', function() {
    $("a[href*='#']").live('click', function() {
        var hash = $(this).attr('href');
        var poundIndex = hash.indexOf('#');
        if(poundIndex > 0)
           hash = hash.substring(poundIndex);
        // Don't intercept the click if there is an existing anchor on the page
        // that matches this hash
        if ( !hasNamedAnchor(hash) ) {
            $.History.add(hash);
            return false;
        }
    });
}
*/
function checkHashIE() {
   /* First, check for address bar change */
   var hash = location.hash;
   if (hash != curHash) {
      updateIEFrame(hash);
      curHash = hash;
      $.event.trigger('hashchange');
      return
   }
   
   // Now check for back/forward button
   // 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.contentDocument || iframe.contentWindow.document;
   idoc.open();
   idoc.close();
   if (idoc.location.hash != hash)
      idoc.location.hash = hash;
}

})(jQuery);