// XMLHTTP Request object
var XmlHttpObj;

// Crea un'istanza di XMLHTTPRequest Object diversificata in base al browser (Mozilla, IE)
function CreateXmlHttpObj()
{
	// si tenta di creare l'instanza per IE
	try
	{
		XmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			XmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
		} 
		catch(oc)
		{
			XmlHttpObj = null;
		}
	}
	// se la creazione per IE non riesce si crea per Mozilla
	if(!XmlHttpObj && typeof XMLHttpRequest != "undefined") 
	{
		XmlHttpObj = new XMLHttpRequest();
	}
}

// funzione chiamata dall'OnChange nella DropDownl List
function OnChange() 
{
    var List = document.getElementById("tipo");
	
    // Ottiene l'elemento selezionato nella dropdown
    var selectedItem = List.options[List.selectedIndex].value;
    
    // Url della pagina che risponderà con il flusso XML
    var requestUrl;
    requestUrl = "http://www.alpitour.it//ajax/xml_preventivo.asp" + "?filter=" + encodeURIComponent(selectedItem);
	CreateXmlHttpObj();
	
	// verifica che la variabile XmlHttpObj sia inizializzata
	if(XmlHttpObj)
	{
        // assign the StateChangeHandler function ( defined below in this file)
        // to be called when the state of the XmlHttpObj changes
        // receiving data back from the server is one such change
		XmlHttpObj.onreadystatechange = StateChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl,  true);
		
		// send request to server, null arg  when using "GET"
		if (encodeURIComponent(selectedItem) != '')
			{
				XmlHttpObj.send(null);		
			}
	}
}


// this function called when state of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function StateChangeHandler()
{
	
	// state ==4 indicates receiving response data from server is completed
	if(XmlHttpObj.readyState == 4)
	{
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttpObj.status == 200)
		{			
			PopulateCountryList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}

// populate the contents of the country dropdown list
function PopulateCountryList(countryNode)
{
    var countryList = document.getElementById("destinazione");
	
	// clear the country list 
	for (var count = countryList.options.length-1; count >-1; count--)
	{
		//countryList.options[count] = null;
		//countryList.optgroup[count] = null;
		
		var numberOfOptions = countryList.options.length   
		for (i=0; i<numberOfOptions; i++)
			{   
			 //Note: Always remove(0) and NOT remove(i)   
			 countryList.remove(0)   
			} 	
	}

	var countryNodes = countryNode.getElementsByTagName('dest');
	var idValue;
	var textValue; 
	var optionItem;
	var optionGroup;

	//---
	//objSelect=document.forms(0).elements(0);
	//optGroup = document.createElement('optgroup')
	//optGroup.label = "New Group"

	//objOption=document.createElement("option")
	//objOption.innerHTML = "Sample1"
	//objOption.value = "sample1"

	//objSelect.appendChild(optGroup)
	//optGroup.appendChild(objOption)
	//---

	// populate the dropdown list with data from the xml doc

	//<!-- Aggiunge la option ---seleziona --- -->
	var opt1 = document.createElement("option");
	opt1.text = '- Seleziona -'
    opt1.value = ''
	document.getElementById("destinazione").options.add(opt1);
	//<!-- fine -->

	for (var count = 0; count < countryNodes.length; count++)
	{
   		//textValue = GetInnerText(countryNodes[count]);
		//idValue = countryNodes[count].getAttribute("id");
		//livValue = countryNodes[count].getAttribute("liv");

		var opt = document.createElement("option");
   		textValue = GetInnerText(countryNodes[count])
		idValue = countryNodes[count].getAttribute("id");
		livValue = countryNodes[count].getAttribute("liv");

		if (livValue == '1')
		{
			textValue = textValue.toUpperCase()
			opt.disabled = 'disabled'
        }
		else if (livValue == '2')
		{
			opt.style.color = '#e4692a'
			textValue = "   " + textValue.toUpperCase()
		}
		else if (livValue == '3')
		{
			textValue = "     " + textValue
		}
		else if (livValue == '4')
		{
			textValue = "       " + textValue			
		}

		// Crea l'oggetto Option da inserire nella DropDown
		//objOption=document.createElement("option")
		//objOption.innerHTML = textValue
		//objOption.value = idValue
		
		// Se il livello è due -> scrive in arancione
		//if (livValue == '2')
		//	{
		//	objOption.style.color = '#e4692a'
		//	}

		// Se il livello è 1 -> crea una OptionGroup
		//if (livValue == "1")
		//	{
			// Apertura della OptionGroup EUROPA
		//	optGroup = document.createElement('optgroup')
		//	optGroup.label = textValue
		//	countryList.appendChild(optGroup)
		//	}
		//else
		//	{
			// Aggiunta dell'elemento nella OptionGroup
			//optGroup.appendChild(objOption)
		//	}
		//countryList.options[countryList.length] = optionItem;
	
		//<!-- Crea l'oggetto option da aggiungere -->
		opt.text = textValue
        opt.value = idValue
		document.getElementById("destinazione").options.add(opt);
		//<!-- fine -->
	}

}

// returns the node text value 
function GetInnerText (node)
{
	 return (node.textContent || node.innerText || node.text) ;
}