/**
*    Chained Selects for jQuery 
*    Copyright (C) 2008 Ziadin Givan www.CodeAssembly.com  
*
*    This program is free software: you can redistribute it and/or modify
*    it under the terms of the GNU General Public License as published by
*    the Free Software Foundation, either version 3 of the License, or
*    (at your option) any later version.
*
*    This program is distributed in the hope that it will be useful,
*    but WITHOUT ANY WARRANTY; without even the implied warranty of
*    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
*    GNU General Public License for more details.
*
*    You should have received a copy of the GNU General Public License
*    along with this program.  If not, see http://www.gnu.org/licenses/
*
*    
*   settings = { usePost : true, before:function() {}, after: function() {}, default: null, parameters : { parameter1 : 'value1', parameter2 : 'value2'} }	
*   if usePost is true, then the form will use POST to pass the parameters to the target, otherwise will use GET
*   "before" function is called before the ajax request and "after" function is called after the ajax request.
*   If defaultValue is not null then the specified option will be selected.
*   You can specify additional parameters to be sent to the the server in settings.parameters.
*
*/
jQuery.fn.chainSelect = function( target, url, settings ) 
{
  return this.each( function()
  {
	$(this).change( function( ) 
	{
		ajaxCallback = function(data, textStatus) 
		{
			$(target).html("");//clear old options
			data = eval(data);//get json array
			for (i = 0; i < data.length; i++)//iterate over all options
			{
			  for ( key in data[i] )//get key => value
			  {	
					$(target).get(0).add(new Option(data[i][key],[key]), document.all ? i : null);
              }
			}
			$(target).change();//call next chain
		};

		$.get( url + $(this).attr('value'), ajaxCallback );

	});
  });
};

jQuery.fn.chainSelectOnLoad = function( target, url, settings ) 
{
  return this.each( function()
  {
		ajaxCallback = function(data, textStatus) 
		{
			$(target).html("");//clear old options
			data = eval(data);//get json array
			for (i = 0; i < data.length; i++)//iterate over all options
			{
			  for ( key in data[i] )//get key => value
			  {	
					if([key]== settings )
					{
					  $(target).get(0).add(new Option(data[i][key],[key],true,true), document.all ? i : null);
					}else{
						$(target).get(0).add(new Option(data[i][key],[key]), document.all ? i : null);
					}
        }
			}
			$(target).change();//call next chain
		};

		$.get( url + $(this).attr('value'), ajaxCallback );
  });
};