// 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();
	}
}
//*************************  COUNTRY SECTION ***********************************///
// called from onChange or onClick event of the country dropdown list
function onChangeCategoryType() 
{
    var categoryList = document.getElementById("users_category");
    // get selected continent from dropdown list
    var selectedCatcode = categoryList.value;
    // url of page that will send xml data back to client browser
    var requestUrl;

    requestUrl = "xml_category_type.php" + "?category_id=" + encodeURIComponent(selectedCatcode);
	//alert(requestUrl);
	CreateXmlHttpObj();
	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 = CategoryTypeChangeHandler;
		//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);		
	}
}


// this function called when province of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function CategoryTypeChangeHandler()
{
	// 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)
		{			
			PopulateCategoryTypeList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
	}
}


// populate the contents of the city dropdown list
function PopulateCategoryTypeList(catTypeNode)
{
    var categoryTypeList = document.getElementById("users_category_type");
	// clear the category type list 
	for (var count = categoryTypeList.options.length-1; count >-1; count--)
	{
		categoryTypeList.options[count] = null;
	}

	var categoryTypeTagNode = catTypeNode.getElementsByTagName('categoryTypeTag');
	var idValue;
	var textValue; 
	var optionItem;
	var CatId	= document.getElementById("users_category").value;

	if(CatId == 4){
		document.getElementById("TR_category_type").style.display = 'none';
		document.getElementById("TR_venue_dtl").style.display = '';
	}else{
		document.getElementById("TR_category_type").style.display = '';
		document.getElementById("TR_venue_dtl").style.display = 'none';
		document.getElementById("cat_type_title").innerHTML	= document.getElementById("users_category").options[document.getElementById("users_category").selectedIndex].text + ' Type';
		// populate the dropdown list with data from the xml doc
		for (var count = 0; count < categoryTypeTagNode.length; count++)
		{
			textValue = GetInnerText(categoryTypeTagNode[count]);
			//alert(textValue);
			idValue = categoryTypeTagNode[count].getAttribute("id");
			optionItem = new Option( textValue, idValue,  false, false);
			categoryTypeList.options[categoryTypeList.length] = optionItem;
		}
	}
}


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