/*======== crea oggetto XMLHttpRequest in base al tipo di browser ============*/
function getXmlHttp(){
	var xmlHttp;
	try
	{
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
		// Internet Explorer
  		try
    	{
    		xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    	}
  		catch (e)
    	{
    		try
      	{
      		xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
      	}
    		catch (e)
      	{
      		alert("Your browser does not support AJAX!");
      		xmlHttp=false;
      	}
    	}
	}
	return xmlHttp;
}
/*======== aggiunge riga in tabella per chiedere conferma eliminazione offerta */
function eliminaOfferta(id){
	var row = document.getElementById(id);
	row.cells[5].innerHTML = "";
	numero_riga = row.rowIndex;
	var newrow=(row.parentNode).insertRow(numero_riga+1);
	var cell_1 = newrow.insertCell(0);
	var cell_2 = newrow.insertCell(1);
	var cell_3 = newrow.insertCell(2);
	cell_1.colSpan=4;
	cell_1.innerHTML = 'Sicuro di eliminare l\'offerta '+id+'?';
	cell_2.innerHTML = '<span class="link" onClick="procedi_eliminaOfferta(\''+id+'\');">Si</span>';
	cell_3.innerHTML = '<span class="link" onClick="annulla_eliminaOfferta(\''+id+'\');">No</span>';
}

/*======= annulla elimina offerta ============================================*/
function annulla_eliminaOfferta(id){
	var row = document.getElementById(id);
	row.cells[5].innerHTML = '<span class="link" onClick="eliminaOfferta(\''+id+'\');">Elimina</span>';
	(row.parentNode).deleteRow(row.rowIndex+1);
}

/*======== post al server per aggiungere una option in database ==============*/
function procedi_eliminaOfferta(id){
	var params = 'id='+id;
	xmlHttp = getXmlHttp();
	
	/*preparazione campo messaggio*/
	var row = document.getElementById(id);
	var messagerow = ((row.parentNode).rows[row.rowIndex+1]);
	messagerow.innerHTML="";
	var message = messagerow.insertCell(0);
	message.colSpan=6;
	
	/*attesa e gestione risposte da php*/
	xmlHttp.onreadystatechange=function(){
		if(xmlHttp.readyState==4 && xmlHttp.status == 200){
			if(xmlHttp.responseText=="eliminata"){
				(row.parentNode).deleteRow(row.rowIndex+1);
				(row.parentNode).deleteRow(row.rowIndex);
			}
			else{
				message.innerHTML=xmlHttp.responseText;
			}
  		}
  	}
	
	/*invio richiesta a php*/
	post('ajax_eliminaOfferta.php',params,xmlHttp);
}

/*======== send with post ==================================================*/
function post(address,content,xmlHttp)
{
	xmlHttp.open("POST",address,true);
	xmlHttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	xmlHttp.setRequestHeader("Content-length", content.length);
	xmlHttp.setRequestHeader("Connection", "close");
	xmlHttp.send(content);
}