AJAX readyState = undefined

[TimothyH]

Hello Codegurus,

The following piece of code returns a readystate that's "undefined".
The alert appears 4 times in IE and in FF. so i reckon the readystate changes 4 times ?; but it's always "undefined".
Could someone tell me what i'm doing wrong?, Thanks.

EDIT: Sorry, just noticed the AJAX forum. feel free to move this topic.

function xmlHttpRequest(){
if (window.XMLHttpRequest)
  {
  return new XMLHttpRequest();
  }
else if (window.ActiveXObject)
  {
  return new ActiveXObject("Microsoft.XMLHTTP");
  }
else
  {
  alert("XMLHTTP not supported.");
  return null;
  }
}

function ajaxFunction(){
 
  var xhr = xmlHttpRequest();
  xhr.onreadystatechange = function(){
   
    alert(this.readystate);

  }
  xhr.open("GET","url",true);
  xhr.send(null); 
}