//cette classe permet de lier un champ select a un autre
var SubSelect=Class.create();
SubSelect.prototype={
	/**
	 * @param idsel1: le select a utiliser en lien
	 * @param idsel2 : le select a modifier
	 * @param lienDonnees l'url a appeller
	
	 * //suppose que la valeur nul soit 0 
	 */
	initialize:function(idsel1,idsel2,lienDonnees,select,options){
		this.idsel=idsel1;
		this.idsel2=idsel2;
		this.Ob1=$(idsel1);
		this.Ob2=$(idsel2);
		this.options = {
			arg:       'arg',
			table: 'result',
			func:'null',
			hide:true,
			'label':'libelle',
			'value':'value',
			'defaultChoose':true
			
		}.extend(options || {});
		//alert('toto');
		this.lienDonnees=lienDonnees;
		this.test=1;
		this.select=select;
		Event.observe(this.Ob1,'change',this.lanceFiltre.bindAsEventListener(this));
		Event.observe(this.Ob2,'change',this.upVal.bindAsEventListener(this));
		if(this.select&&this.select!=''){
			new_option = new Option(this.select,this.select);
			this.Ob2.options[this.Ob2.length]=new_option;
			this.Ob2.options[this.Ob2.length-1].selected = true;
		}
		//ajaxEngine.registerRequest( 'filtre'+idsel1, lienDonnees);
		//ajaxEngine.registerAjaxObject( IdData,this );
		this.lanceFiltre();
	},
	upVal:function(evt){
		this.select=$F(this.idsel2);
	},
	lanceFiltre:function (evt){
		valeur=$F(this.idsel);
		pars=this.options.arg+'='+valeur;
		var uri=this.lienDonnees+'&'+this.options.arg+'='+valeur;
		if(this.options.func!='null'){
			uri+=this.options.func.apply(window,[]);
		}
	//	alert (uri);
		if(valeur!='0'&&valeur!=''){
			//alert('valeur vaux'+valeur+'|');
			var myAjax5 = new Ajax.Request(
			uri, { method : "post", parameters : pars,  asynchronous : true,evalScripts:true,
			onComplete:this.ajaxUpdate,objetLie:this});
			
			//ajaxEngine.sendRequest('filtre'+this.idsel,"args="+valeur,"idretour="+this.IdData);
		}else{
			//alert('je cache'+this.idsel2);
			if(this.options.hide){
				Element.hide(this.idsel2);
			}else{
				lo=this.Ob2.length;
		for (i=lo; i>=0; i--) {
			this.Ob2.options[i]=null;
		}
				new_option = new Option(this.options.msg+'',0);
				//alert('test');
				this.Ob2.options[this.Ob2.length]=new_option;
				this.Ob2.selectedIndex=-1;
				try{
					this.Ob2.fireEvent('onchange');
				}catch(e){
					var evt = document.createEvent("HTMLEvents");
      				 evt.initEvent('change', true, true ); // event type,bubbling,cancelable
        			this.Ob2.dispatchEvent(evt);
				}
			}
		}
	},
	ajaxUpdate:function(ajaxResponse){
		for(var i in this){
		//	alert(i+' '+this[i]);
		}
		//alert(ajaxResponse.responseText);
		eval('var res='+ajaxResponse.responseText);
		var libTab=this.options.table;
		res=res[libTab];
		Element.show(this.idsel2);
		max=res.length;
		// remise a 0 du tableau d
		lo=this.Ob2.length;
		for (i=lo; i>=0; i--) {
			this.Ob2.options[i]=null;
		}
		if((this.options.defaultChoose)){
			this.Ob2.options[0]= new Option('','');
		}
		lib=this.options.label;
		val=this.options.value;
		for(i=0;i<max;i++){
			resp=res[i];
			new_option = new Option(resp[lib],resp[val]);
			this.Ob2.options[this.Ob2.length]=new_option;
			//alert(this.Ob2.options[this.Ob2.length]);
			if(resp.value==this.select){
				this.Ob2.options[this.Ob2.length-1].selected = true;
			}
		}
	}

}