// global flag
var isIE = false;

// global request and XML document objects
var req;

// retrieve XML document (reusable generic function);
// parameter is URL string (relative or complete) to
// an .xml file whose Content-Type is a valid XML
// type, such as text/xml; XML source must be from
// same domain as HTML file
function loadXMLDoc(phrase)
    {
    url = 'check_username?phrase=' + phrase
    // branch for native XMLHttpRequest object
    if (window.XMLHttpRequest)
	{
        req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
        req.send(null);
    // branch for IE/Windows ActiveX version
	}
    else
	if (window.ActiveXObject)
	    {
	    isIE = true;
	    req = new ActiveXObject("Microsoft.XMLHTTP");
	    if (req)
		{
		req.onreadystatechange = processReqChange;
		req.open("GET", url, true);
		req.send();
		}
	    }
    }

// handle onreadystatechange event of req object
function processReqChange()
    {
    // only if req shows "loaded"
    if (req.readyState == 4)
	{
        // only if "OK"
        if (req.status == 200)
	    {
            //clearTopicList();
            //buildTopicList();
	    handleXMLResponse();
	    }
	else
	    {
            alert("There was a problem retrieving the XML data:\n" +
                req.statusText);
	    }
	}
    }

// invoked by "Category" select element change;
// loads chosen XML document, clears Topics select
// element, loads new items into Topics select element
function loadDoc(evt)
    {
    // equalize W3C/IE event models to get event object
    evt = (evt) ? evt : ((window.event) ? window.event : null);
    if (evt)
	{
        // equalize W3C/IE models to get event target reference
        var elem = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
        if (elem)
	    {
            try
		{
                //if (elem.selectedIndex > 0)
		    {
                    //loadXMLDoc(elem.options[elem.selectedIndex].value);
		    loadXMLDoc(elem.value);
		    }	
		}
            catch(e)
		{
                var msg = (typeof e == "string") ? e : ((e.message) ? e.message : "Unknown Error");
                alert("Unable to get XML data:\n" + msg);
                return;
		}
	    }
	}
    }

// retrieve text of an XML document element, including
// elements using namespaces
function getElementTextNS(prefix, local, parentElem, index)
    {
    var result = "";
    if (prefix && isIE)
	{
        // IE/Windows way of handling namespaces
        result = parentElem.getElementsByTagName(prefix + ":" + local)[index];
	}
    else
	{
        // the namespace versions of this method 
        // (getElementsByTagNameNS()) operate
        // differently in Safari and Mozilla, but both
        // return value with just local name, provided 
        // there aren't conflicts with non-namespace element
        // names
        result = parentElem.getElementsByTagName(local)[index];
	}
    if (result)
	{
        // get text, accounting for possible
        // whitespace (carriage return) text nodes 
        if (result.childNodes.length > 1)
	    {
            return result.childNodes[1].nodeValue;
	    }
	else
	    {
            return result.firstChild.nodeValue;    		
	    }
	}
    else
	{
        return "n/a";
	}
    }

// empty Topics select list content
function clearTopicList()
    {
    var select = document.getElementById("topics");
    while (select.length > 0)
	{
        select.remove(0);
	}
    }

// fill Topics select list with items from
// the current XML document
function buildTopicList()
    {
    var select = document.getElementById("topics");
    var items = req.responseXML.getElementsByTagName("item");
    // loop through <item> elements, and add each nested
    // <title> element to Topics select element
    for (var i = 0; i < items.length; i++)
	{
        appendToSelect(select, i,
            document.createTextNode(getElementTextNS("", "title", items[i], 0)));
	}
    // clear detail display
    document.getElementById("details").innerHTML = "";
    }

function handleXMLResponse()
    {
    var yorn = document.getElementById("yea_or_nay");
    yorn.value = 'starting...';
    var resp = req.responseXML.getElementsByTagName("response")[0];
    var result = getElementTextNS("","result",resp,0);
    if ( result == 'taken')
         yorn.style.color = "red";
    else
         yorn.style.color = "green";
    yorn.innerHTML = '&nbsp;Username ' + result;

    }

// display details retrieved from XML document
function showDetail(evt)
    {
    evt = (evt) ? evt : ((window.event) ? window.event : null);
    var item, content, div;
    if (evt)
	{
        var select = (evt.target) ? evt.target : ((evt.srcElement) ? evt.srcElement : null);
        if (select && select.options.length > 1)
	    {
            // copy <content:encoded> element text for
            // the selected item
            item = req.responseXML.getElementsByTagName("item")[select.value];
            content = getElementTextNS("content", "encoded", item, 0);
            div = document.getElementById("details");
            div.innerHTML = "";
            // blast new HTML content into "details" <div>
            div.innerHTML = content;
	    }
	}
    }

function verifyKeyAndLoadDoc(widget, evt)
    {
    var strip_re = /[\!\@\#\$\%\^\&\*\/\?]/;
    var space_re = /\s/;
    var v = widget.value;
    v = v.replace(strip_re,"")
    v = v.replace(space_re,"_")
    widget.value = v;
    return loadDoc(evt);
    }
    
function checkInput()
{
  if ( document.adduser.uname.value == ''  ) {
  alert('Please enter Username')
  return false;
  }
  if ( document.adduser.password.value == '') {
  alert('Please enter Password')
  return false;
  }
  if ( document.adduser.pass_confirm.value == '') {
  alert('Please enter Password Confirm')
  return false;
  }
  if ( document.adduser.pass_confirm.value != document.adduser.password.value) {
  alert('Password must be the same as Password Confirm')
  return false;
  }
  var yorn = document.getElementById("yea_or_nay");
   if ( yorn.innerHTML == '&nbsp;Username taken') {
  alert('Please change Username. This one is taken')
  return false;
  }
  return true;
}


/* arch-tag: 921c89ce-450b-4f2d-9b24-1a7a3a2551dc */