Ajax Issue with IE

Hi,

I am running the following code on my website:

function showHint2(str)
{
if (str.length==0)
  { 
  document.getElementById("txtHint").innerHTML="";
  return;
  }
if (window.XMLHttpRequest)
  {// code for IE7+, Firefox, Chrome, Opera, Safari
  xmlhttp=new XMLHttpRequest();
  }
else
  {// code for IE6, IE5
  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
  }
xmlhttp.onreadystatechange=function()
  {
  if (xmlhttp.readyState==4 && xmlhttp.status==200)
    {
	document.getElementById('course').innerHTML = xmlhttp.responseText;
    }
  }
  
  var params = [];

params.push("q=" + str);
params.push("u=" + document.getElementById("university").value);
params.push("w=" + document.getElementById("university2").value);

var url = "update-course.php?" + params.join("&");
  
  infoStr = str+"&u="+document.getElementById('university').value+"&w="+document.getElementById('university2').value;
xmlhttp.open("GET",url,true);
xmlhttp.send();
}

Code (markup):

require_once('init.php');
	
	//get the q parameter from URL
	$choice=$_GET["q"];
	$uni=$_GET["u"];
	$uni2=$_GET["w"];
	
	if ($choice == 'Postgraduate'){
		$year_of_study = "Postgraduate";
	}else{
		$year_of_study = "Undergraduate";
	}
	 
	if ($uni2 == '-1'){ 
	$query = mysql_query("SELECT * FROM universities WHERE year_of_study = '$year_of_study' AND university = '$uni'");
	}else{
	$query = mysql_query("SELECT * FROM universities WHERE year_of_study = '$year_of_study' AND university = '$uni2'");	
	}
	while ($row = mysql_fetch_array($query))
			{
	 	 	 print "<option value='" . $row['course'] . "'>" . $row['course'] . "</option>";
			}
		

PHP:

Which works fine on all browsers except IE. Does anyone have any ideas why this would not work on IE?

Cheers,
Adam

 

Maybe a problem with the HTML.
PM me more details.

Will have you sorted in minutes.

 

Is I.E showing a javascript error? If so, then what does the error say and what line... As far as I can tell, the code looks fine. The only thing I can think of is for you to declare xmlhttp at the start of your code (before function showHint2) like:

var xmlhttp;

Code (markup):

 

I tested the same code in IE8 and it worked