// declare a global  XMLHTTP Request object
var XmlHttpObj;

// create an instance of XMLHTTPRequest Object, varies with browser type, try for IE first then Mozilla
function CreateXmlHttpObj()
{
	// try creating for IE (note: we don't know the user's browser type here, just attempting IE first.)
	try
	{
		XmlHttpObj = new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch(e)
	{
		try
		{
			XmlHttpObj = new ActiveXObject("Microsoft.XMLHTTP");
		}
		catch(oc)
		{
			XmlHttpObj = null;
		}
	}
	// if unable to create using IE specific code then try creating for Mozilla (FireFox) 
	if(!XmlHttpObj && typeof XMLHttpRequest != "undefined") 
	{
		XmlHttpObj = new XMLHttpRequest();
	}
}

// called from onChange or onClick event of the continent dropdown list
function TourListOnChange() 
{
    var F_TourList = document.getElementById("F_TourList");
    
    // get selected continent from dropdown list
    var selectedTour = F_TourList.options[F_TourList.selectedIndex].value;
    
    // url of page that will send xml data back to client browser
    var requestUrl;
    // use the following line if using php
    requestUrl = "Scripts/CustomTour_xml_data_provider.php" + "?CustomTourID=" + encodeURIComponent(selectedTour);
	
	document.getElementById("TourID").value = encodeURIComponent(selectedTour);
    
	
	CreateXmlHttpObj();
	
	// verify XmlHttpObj variable was successfully initialized
	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"
		XmlHttpObj.send(null);		
	}
	
JSFF_GetOptionsList(0);
JSFF_GetPrices(0);

}


// 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)
		{			
			Populate_PickUpDropOff_List(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
	
	
}

// populate the contents of the country dropdown list
function Populate_PickUpDropOff_List(PickUpDropOffNode)
{
    var F_PickUpDropOffList = document.getElementById("F_PickUpDropOffList");
	// clear the country list 
	for (var count = F_PickUpDropOffList.options.length; count >0; count--)
	{
		F_PickUpDropOffList.options[count] = null;
	}

	var PickUpDropOffNodes = PickUpDropOffNode.getElementsByTagName('PickUpDropOff');
	var idValue;
	var textValue; 
	var optionItem;
	// populate the dropdown list with data from the xml doc
	for (var count = 0; count < PickUpDropOffNodes.length; count++)
	{
   		textValue = GetInnerText(PickUpDropOffNodes[count]);
		idValue = PickUpDropOffNodes[count].getAttribute("id");
		optionItem = new Option( textValue, idValue,  false, false);
		F_PickUpDropOffList.options[F_PickUpDropOffList.length] = optionItem;
	}
	
}

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