/**
*    Chained Selects for JQuery 
*    Copyright (C) 2007 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() {}, 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
*   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( ) 
	{
		settings = jQuery.extend(
		{
			after : null,
			before : null,
			usePost : false,
			parameters : { '_id' :  $(this).attr('id'), '_name' : $(this).attr('name') },
        } , settings);
		settings.parameters._value =  $(this).val();

		if ( settings.before != null ) 
		{
			settings.before( target );
		}

  		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);
               }
			}

		if (settings.after != null  ) 
		{
			settings.after( target );
		}

		$(target).change();//call next chain
	};

	if ( settings.usePost == true )
	{
		$.post( url, settings.parameters, ajaxCallback );
	} else
	{
		$.get( url, settings.parameters, ajaxCallback );
	}

	$("option:first", target).attr( "selected", "selected" );//select first option
	});
  });
};