//Global XMLHTTP Request object
var XmlHttp;

//Creating and setting the instance of appropriate XMLHTTP Request object to a “XmlHttp” variable  
function CreateXmlHttp()
{
	//Creating object of XMLHTTP in IE
	try
	{
		XmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			XmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		} 
		catch(oc)
		{
			XmlHttp = null;
		}
	}
	//Creating object of XMLHTTP in Mozilla and Safari 
	if(!XmlHttp && typeof XMLHttpRequest != "undefined") 
	{
		XmlHttp = new XMLHttpRequest();
	}
}

//Gets called when country combo box selection changes
function MakeModelListOnChange(Category, ProductType) 
{
	var MakeModelList = document.getElementById("ddlMakeModel");

	//Getting the selected country from country combo box.
	var selectedMakeModel = MakeModelList.options[MakeModelList.selectedIndex].value;
		
	// URL to get states for a given country
	var requestUrl = "ajaxGetYears.aspx" + "?Category=" + Category + "&ProductType=" + ProductType + "&MakeModel=" + encodeURIComponent(selectedMakeModel);
	CreateXmlHttp();
	
	// If browser supports XMLHTTPRequest object
	if(XmlHttp)
	{
		//Setting the event handler for the response
		XmlHttp.onreadystatechange = HandleResponse;
		
		//Initializes the request object with GET (METHOD of posting), 
		//Request URL and sets the request as asynchronous.
		XmlHttp.open("GET", requestUrl,  true);
		
		//Sends the request to server
		XmlHttp.send(null);		
	}
}


//Called when response comes back from server
function HandleResponse()
{
	// To make sure receiving response data from server is completed
	if(XmlHttp.readyState == 4)
	{
		// To make sure valid response is received from the server, 200 means response received is OK
		if(XmlHttp.status == 200)
		{			
			//ClearAndSetYearListItems(XmlHttp.responseXML.documentElement);
			ClearAndSetYearListItems(XmlHttp.responseText );
			
		}
		else
		{
			alert("There was a problem retrieving data from the server." );
		}
	}
}

//Clears the contents of state combo box and adds the states of currently selected country
function ClearAndSetYearListItems(strIn)
{
    var YearList = document.getElementById("ddlYear");
	//Clears the state combo box contents.
	for (var count = YearList.options.length-1; count >-1; count--)
	{
		YearList.options[count] = null;
	}

	//var stateNodes = countryNode.getElementsByTagName('state');
	//var textValue; 
	var optionItem;
	//Add new states list to the state combo box.
	//for (var count = 0; count < stateNodes.length; count++)
	//{
   	//	textValue = GetInnerText(stateNodes[count]);
		//optionItem = new Option( textValue, textValue,  false, false);
		
		//optionItem = new Option(strIn, strIn,  false, false);
		//YearList.options[YearList.length] = optionItem;
		
		document.getElementById("YearArrow").src="images/redarrow.gif";
		document.getElementById("MakeModelArrow").src="images/spacer.gif";
		YearList.disabled=false;
		optionItem = new Option('Choose Year', '',  false, false);
		YearList.options[YearList.length] = optionItem;

		var addYear = strIn.split('|');		
		for(i=0; i!=addYear.length; i++)
			{
				if(addYear[i] != '') {
					optionItem = new Option(addYear[i], addYear[i],  false, false);
					YearList.options[YearList.length] = optionItem;
					}
			}
			
	//}
}

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