// declare a global  XMLHTTP Request object
var XmlHttpObj;

//var ADMIN_BASE = '/EBCC-MMS/ebccmms/admin/';
var ADMIN_BASE = '/mms/admin/';

var xmlasync = false; 
//var isff = (navigator.userAgent.indexOf('Firefox') !=-1) ? true : false;



// 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();
			isff = true;
	}

}

// called from onChange or onClick event of the continent dropdown list
function ContinentListOnChange() 
{
    var continentList = document.getElementById("continentList");
    
    // get selected continent from dropdown list
    var selectedContinent = continentList.options[continentList.selectedIndex].value;
    
    // url of page that will send xml data back to client browser
    var requestUrl;
    // use the following line if using asp
    requestUrl = ADMIN_BASE+"xml_data_provider.php" + "?table=list&filter=" + encodeURIComponent(selectedContinent);

    // use the following line if using php
    // requestUrl = "xml_data_provider.php" + "?filter=" + encodeURIComponent(selectedContinent);
  
	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 = CountryChangeHandler;
		
		// define the iteraction with the server -- true for as asynchronous.
		XmlHttpObj.open("GET", requestUrl,  xmlasync);
		// send request to server, null arg  when using "GET"
		XmlHttpObj.send(null);		
		
		if(XmlHttpObj.status == 200)
		{
			PopulateCountryList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}
		
	}
}
// this function called when state of  XmlHttpObj changes
// we're interested in the state that indicates data has been
// received from the server
function CountryChangeHandler()
{
	// 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("countryList");
	// clear the country list 
	for (var count = countryList.options.length-1; count >-1; count--)
	{
		countryList.options[count] = null;
	}
	
	if( countryNode!=null ) {
		var countryNodes = countryNode.getElementsByTagName('country');
		var idValue;
		var textValue; 
		var optionItem;
		// populate the dropdown list with data from the xml doc
		textValue = "";
		idValue = "";
		optionItem = new Option( textValue, idValue,  false, false);
		countryList.options[countryList.length] = optionItem;
		for (var count = 0; count < countryNodes.length; count++)
		{
	   		textValue = GetInnerText(countryNodes[count]);
			idValue = countryNodes[count].getAttribute("id");
			optionItem = new Option( textValue, idValue,  false, false);
			countryList.options[countryList.length] = optionItem;
		}
	}
}
// returns the node text value 
function GetInnerText (node)
{
	 return (node.textContent || node.innerText || node.text) ;
}




////////////////////////////////////////////

// called from onChange or onClick event of the continent dropdown list
function sectorOnChange() 
{
    var sectorList = document.getElementById("sectorList");
    var selectedSector = sectorList.options[sectorList.selectedIndex].value;
    var requestUrl;
  
   requestUrl = ADMIN_BASE+"xml_data_provider.php" + "?table=activity&filter=" + encodeURIComponent(selectedSector);
  
	CreateXmlHttpObj();
	
	// verify XmlHttpObj variable was successfully initialized
	if(XmlHttpObj)
	{
		//XmlHttpObj.onreadystatechange = SectorChangeHandler;
		XmlHttpObj.open("GET", requestUrl,  xmlasync);
		XmlHttpObj.send(null);		

		if(XmlHttpObj.status == 200)
		{			
			PopulateActivityList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
		}

	}
}

function SectorChangeHandler()
{
	// 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)
		{			
			PopulateActivityList(XmlHttpObj.responseXML.documentElement);
		}
		else
		{
			alert("problem retrieving data from the server, status code: "  + XmlHttpObj2.status);
		}
	}
}

function PopulateActivityList(activityNode) {
  var activityList = document.getElementById("activityList");
	// clear the activity list 
	for (var count = activityList.options.length-1; count >-1; count--)
	{
		activityList.options[count] = null;
	}
	// clear subactivity list
	PopulateSubActivityList(null);
	

	if( activityNode!=null )  {
		var activityNodes = activityNode.getElementsByTagName('activity');
		var idValue;
		var textValue; 
		var optionItem;
		
		// populate the dropdown list with data from the xml doc
   	textValue = "";
		idValue = "";
		optionItem = new Option(textValue, idValue,  false, false);
		activityList.options[activityList.length] = optionItem;
		for (var count = 0; count < activityNodes.length; count++)
		{
	   	textValue = GetInnerText(activityNodes[count]);
			idValue = activityNodes[count].getAttribute("id");
			optionItem = new Option(textValue, idValue,  false, false);
			activityList.options[activityList.length] = optionItem;
		}	
	}
}




function activityOnChange()
{
    var activityList = document.getElementById("activityList");
    if(activityList.selectedIndex!=-1) {
    	
	    var selectedActivity = activityList.options[activityList.selectedIndex].value;
	    var requestUrl;
	  
	   requestUrl = ADMIN_BASE+"xml_data_provider.php" + "?table=subactivity&filter=" + encodeURIComponent(selectedActivity);
	
		CreateXmlHttpObj();
		
		// verify XmlHttpObj variable was successfully initialized
		if(XmlHttpObj)
		{
			//XmlHttpObj.onreadystatechange = ActivityChangeHandler;
			XmlHttpObj.open("GET", requestUrl,  xmlasync);
			XmlHttpObj.send(null);		

			// To make sure valid response is received from the server, 200 means response received is OK
			if(XmlHttpObj.status == 200)
			{			
				PopulateSubActivityList(XmlHttpObj.responseXML.documentElement);
			}
			else
			{
				alert("problem retrieving data from the server, status code: "  + XmlHttpObj.status);
			}

		}
	}
}

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

function PopulateSubActivityList(subActivityNode) {
  var subActivityList = document.getElementById("sub_activityList");
	// clear the activity list 
	for (var count = subActivityList.options.length-1; count >-1; count--)
	{
		subActivityList.options[count] = null;
	}

	if( subActivityNode!=null )  {
		var subActivityNodes = subActivityNode.getElementsByTagName('subActivity');
		var idValue;
		var textValue; 
		var optionItem;
		
		// populate the dropdown list with data from the xml doc
   	textValue = "";
		idValue = "";
		optionItem = new Option(textValue, idValue,  false, false);
		subActivityList.options[subActivityList.length] = optionItem;
		for (var count = 0; count < subActivityNodes.length; count++)
		{
	   	textValue = GetInnerText(subActivityNodes[count]);
			idValue = subActivityNodes[count].getAttribute("id");
			optionItem = new Option(textValue, idValue,  false, false);
			subActivityList.options[subActivityList.length] = optionItem;
		}	
	}	
}