/**
*    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.
*
*	@modified 2008-11 mettbox - use jQuery non-conflict mode
*
*/

jQuery.fn.chainSelect = function( target, url, settings ) 
{
  return this.each( function()
  {
	jQuery(this).change( function() 
	{	
		settings = jQuery.extend({
			after : null,
			before : null,
			usePost : false,
			defaultValue : null,
			parameters : { '_id' : jQuery(this).attr('id') }
        } , settings);

		settings.parameters._value =  jQuery(this).val();
		
		settings.parameters._locomotion_id =  jQuery('#locomotion_id :selected').val();
		settings.parameters._route_id =  jQuery('#route_id :selected').val();
		
		if (settings.before != null) {
			settings.before( target );
		}

		ajaxCallback = function(data, textStatus) 
		{
            //clear old options
			jQuery(target).html("");
            //get json array
			data = eval(data);
            // iterate over all options
			for (i = 0; i < data.length; i++)
			{
                //get key => value
                for (key in data[i]) {	
                    jQuery(target).get(0).add(new Option(data[i][key],[key]), document.all ? i : null);
                }
			}

			if (settings.defaultValue != null) {
                //select default value
				jQuery(target).val(settings.defaultValue);
			} else {
                //select first option
				jQuery("option:first", target).attr( "selected", "selected" );
			}

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

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

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