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Newbie to XML - problem using xmlhttp

From: Tim Platt <tjp@------.--.-->
To: NULL
Date: 6/4/2007 6:39:00 AM


Until now I have not had any reason to learn about XML. I have spent
quite a few hours playing with examples and reading group discussions
like these - with a certain amount of success. However, I have a
specific task to accomplish, and so far I have fallen at the last
hurdle.

I want to display the following 'feed' from an external server on our
clients:

http://www.q3.hpi.co.uk/servlet/HpiGate1_0?forward=YES&efxid=0502863&password=testing&initials=tp&function=SEARCH&vrm=V110ABE&XML=YES&product=HPI11&deviceType=XM

I believe this generates data in an xml format. I assume that using
xmlhttp is the correct protocol to use (if I'm wrong please tell me).

I have copied the following code from http://www.w3schools.com:

<html>
<head>
<script type="text/javascript">
var xmlhttp

function loadXMLDoc(url)
{
xmlhttp=null
// code for Mozilla, etc.
if (window.XMLHttpRequest)
  {
  xmlhttp=new XMLHttpRequest()
  }
// code for IE
else if (window.ActiveXObject)
  {
  xmlhttp=new ActiveXObject("msxml2.XMLHTTP")
  }
if (xmlhttp!=null)
  {
  xmlhttp.onreadystatechange=onResponse;
  xmlhttp.open("GET",url,true);
  xmlhttp.setRequestHeader("Content-Type","text/xml")
  xmlhttp.send(null);
  }
else
  {
  alert("Your browser does not support XMLHTTP.")
  }
}

function checkReadyState(obj)
{
  if(obj.readyState == 4)
  {
    if(obj.status == 200)
    {
      return true;
    }
    else
    {
      alert("Problem retrieving XML data");
    }
  }
}

function onResponse()
{
  if(checkReadyState(xmlhttp))
  {
  document.getElementById('A1').innerHTML=xmlhttp.status;
  document.getElementById('A2').innerHTML=xmlhttp.statustext;
  document.getElementById('A3').innerHTML=xmlhttp.responsetext;
  var response = xmlhttp.responseXML.documentElement;
 
document.getElementById('A4').innerHTML=response.getElementsByTagName("Model")
[0].firstChild.data;
  }
}
</script>
</head>

<body onLoad="loadXMLDoc('http://www.q3.hpi.co.uk/servlet/HpiGate1_0?
forward=YES&efxid=0502863&password=testing&initials=tp&function=SEARCH&vrm=V110ABE&XML=YES&product=HPI11&deviceType=XM');">

<p><b>status:</b>
<span id="A1"></span>
</p>

<p><b>status text:</b>
<span id="A2"></span>
</p>

<p><b>response:</b>
<span id="A3"></span>
</p>

<p><b>response:</b>
<br><span id="A4"></span>
</p>

</body>
</html>

This appears to work fine for the status and reponsetext but I get an
error message for the responsexml - the error messages says the
elementbytagname is null.

However, if I manually save the xml file to disc and then replace the
server URL (in loadXMLDoc) with the name of the xml file it displays
the data i.e I don't get an error message.

What am I doing wrong here? I clearly don't really understand the use
of xmlhttp .

Any assistance would be gratefully received.

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