// JavaScript Document
 /*
 * jQuery related selects plug-in 0.3
 *
 * http://www.erichynds.com/jquery/jquery-related-dependent-selects-plugin/
 * http://github.com/ferric84/jquery-related-selects
 *
 * Copyright (c) 2009 Eric Hynds
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

(function($){$.fn.extend({relatedSelects:function(opts){opts=$.extend({},$.RelatedSelect.defaults,opts);return this.each(function(){new $.RelatedSelect(this,opts);});}});$.RelatedSelect=function(context,opts){var $context=$(context);var selects=[];if($.isArray(opts.selects))selectsToObj();for(key in opts.selects)selects.push(key);saveDefaultOptionText();$.each(opts.selects,function(elem,o){var $select=$("select[name='"+elem+"']",$context);var $next=next(elem);var selectedValue=$select.find('option:selected').attr('value');o=$.extend({defaultOptionText:opts.defaultOptionText||$select.data('defaultOption')},opts,o);$select.data('defaultOption',o.defaultOptionText);$select.change(function(){o.onChange.call($select);process($select,$next,elem,o);});if(selectedValue&&selectedValue.length>0&&isPopulated($next))return;process($select,$next,elem,o);});function saveDefaultOptionText(){var $select,text;for(var x=1,xx=selects.length;x<xx;x++){$select=$("select[name='"+selects[x]+"']",$context);text=$("option[value='']",$select).text();$select.data('defaultOption',text);};};function process($select,$next,elem,o){if($next.length===0)return;var value=$.trim($select.find('option:selected').attr('value'));if(value.length>0&&value!==o.loadingMessage&&$next){resetAfter(elem);populate($select,$next,o);}else if($next){resetAfter(elem);};};function populate($caller,$select,o){var selectors=[],params=[];for(var x=0;x<selects.length;x++){selectors.push('select[name="'+selects[x]+'"]');};params=$(selectors.join(','),$context).serialize();$select.attr("disabled","disabled").html('<option value="">'+o.loadingMessage+'</option>');$.ajax({beforeSend:function(){o.onLoadingStart.call($select);},complete:function(){o.onLoadingEnd.call($select);},dataType:o.dataType,data:params,url:o.onChangeLoad,success:function(data){var html='',defaultOptionText=$select.data('defaultOption');if(defaultOptionText.length>0)html='<option value="" selected="selected">'+defaultOptionText+'</option>';if(o.dataType==='json'&&typeof(data)==='object'&&data){$.each(data,function(i,item){html+='<option value="'+i+'">'+item+'</option>';});$select.html(html).removeAttr('disabled');}else if(o.dataType==='html'&&$.trim(data).length>0){html+=$.trim(data);$select.html(html).removeAttr('disabled');}else{$select.html(html);if(!o.disableIfEmpty){$select.removeAttr('disabled');};o.onEmptyResult.call($caller);};}});};function isPopulated($select){var options=$select.find('option');return(options.length===0||(options.length===1&&options.filter(':first').attr('value').length===0))?false:true;};function resetAfter(elem){var thispos=getPosition(elem);for(var x=thispos+1;x<selects.length;x++){$("select[name='"+selects[x]+"']",$context).attr("disabled","disabled").find("option:first").attr("selected","selected");};};function next(elem){return $("select[name='"+selects[getPosition(elem)+1]+"']",$context);};function getPosition(elem){for(var i=0,ii=selects.length;i<ii;i++){if(selects[i]===elem){return i;};};};function selectsToObj(){var arrSelects=opts.selects;opts.selects={};for(var i=0,ii=arrSelects.length;i<ii;i++){opts.selects[arrSelects[i]]={};};};};$.RelatedSelect.defaults={selects:{},loadingMessage:'Loading, please wait...',disableIfEmpty:false,dataType:'json',onChangeLoad:'',onLoadingStart:function(){},onLoadingEnd:function(){},onChange:function(){},onEmptyResult:function(){}};})(jQuery);