AJAX question/issue

**rhart** · February 9th, 2011 01:40 PM

I am new to AJAX and am trying to write my first AJAX program. I am trying to reach out and connect with a server. I "should" be getting some XML data sent back to me but my responseXML remains null. Below is the code I am using and I will also print out what I am hoping to get back. I am able to create the XMLHttpRequest and my readyState does reach 4. My status is 0 but I expected that.

The code (and I have included some document.writes just to help me debug) is:

Code:

<html>
<head>
<script type="text/javascript">
function loadXMLDoc()
{
document.write(" In function");
var xmlhttp;
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  document.write(" created request ");
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }

xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4)
    {
    document.write(xmlhttp.responseText);
    }
  }
xmlhttp.open("GET","http://localhost:8080/vlrestapi/v1.0/system",true);
xmlhttp.send();
}
</script>
</head>
<body>

<h2>AJAX</h2>
<button type="button" onclick="loadXMLDoc()">Request data</button>

</body>
</html>

When I put the "http://localhost:8080/vlrestapi/v1.0/system" into a browser, this is what I get back and what I hope to pull back with my AJAX program but it is not happening:

Code:

<?xml version="1.0" encoding="UTF-8" ?> 
- <VLResponse>
  <content class="string">VisuaLinks REST API | Host: nb-lhunt/192.168.183.1 | Time: Wed Feb 09 14:38:56 EST 2011</content> 
  </VLResponse>

Any help anyone could give me would be greatly appreciated.

Thank you

**PeejAvery** · February 9th, 2011 08:34 PM

Make sure the status returns 200 before grabbing the responseText or responseXML.

http://www.w3schools.com/ajax/ajax_aspphp.asp

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