// 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 country dropdown list
function CountryListOnChange() 
{
//    var countryList = document.getElementById('ccid');
    var countryList = document.getElementById('ccid');
    
    // get selected country from dropdown list
    var selectedCountry = countryList.options[countryList.selectedIndex].value;
    
    // url of page that will send xml data back to client browser
    var requestUrl;
    requestUrl = "include/ajax/areacode-list.php" + "?filter=" + encodeURIComponent(selectedCountry);
    
	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);		
	}
}


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

// populate the contents of the areacode dropdown list
function PopulateAreaCodeList(areacodeNode)
{
    var areacodeList = document.getElementById("acid");
	// clear the country list 
	for (var count = areacodeList.options.length-1; count >-1; count--)
	{
		areacodeList.options[count] = null;
	}

	var areacodeNodes = areacodeNode.getElementsByTagName('areacode');
	var idValue;
	var textValue; 
	var optionItem;
	// populate the dropdown list with data from the xml doc
  if (areacodeNodes.length == 0)
  {
	  optionItem = new Option("Area Code", 0,  false, false);
    areacodeList.options[areacodeList.length] = optionItem;
    areacodeList.disabled = true;
  }
	for (var count = 0; count < areacodeNodes.length; count++)
	{
  	textValue = GetInnerText(areacodeNodes[count]);
		acValue = areacodeNodes[count].getAttribute("ac");
		acidValue = areacodeNodes[count].getAttribute("id");
    
		optionItem = new Option( acValue + "   " + textValue, acidValue,  false, false);
		areacodeList.options[areacodeList.length] = optionItem;
    areacodeList.disabled = false;
	}
}

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

function adjustCurrencyList()
{
  country_id = document.getElementById('ccid').selectedIndex;
  currency_elem = document.getElementById('currency');
  switch (country_id)
  {
    // currency = AUD
    case 1: 
    case 4: 
      currency_elem.options[1].selected = true; return;
    // currency = USD
    case 2:
    case 3:
    case 6: 
      currency_elem.options[2].selected = true; return;
    // currency = GBP;
    case 5:
      currency_elem.options[3].selected = true; return;
    default:
      currency_elem.options[2].selected = true; return;
  }
}