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Ajax xmlHttpObject.open() call works in Mozilla but not in IE

Posted on 2009-07-15
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Last Modified: 2012-05-07
I have a piece of javascript code for Ajax requests that works great in Mozilla but not in IE.

The main method that will be called is getSpeed()
It seems the error in IE is at the point when I call: xmlHttpObject.open(....
The IE throws "Unknown runtime error"

I'm new at Ajax and not sure what I'm doing wrong. Can someone please advise?

Thanks in advance for all the help.
var xmlHttpObject = getXmlHttpRequestObject();
 
/**
 * Create XMLHttpRequestObject.
 **/
function getXmlHttpRequestObject()
{  
	var xmlHttp;
  	try
   	{    
		alert("// Firefox, Opera 8.0+, Safari");    
		xmlHttp=new XMLHttpRequest();    
	}
  	catch (e)
    	{	alert("// Internet Explorer");    
		try
      		{	      
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");      
		}
    		catch (e)
      		{      
			try
        		{        
				xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
			}
			catch (e)
        		{        
				alert("Your browser does not support AJAX!");        
				return false;        
			} // end catch
		}   // end catch
	}  // end catch
	
  	alert("xmlHttp:" + xmlHttp);
  	
	return xmlHttp;
} // end function
 
/**
 * Called when the AJAX response is returned
 **/ 
function handleResponse() 
{	
	// Check to make sure our response is ready
	if (xmlHttpObject.readyState == 4) 
	{	
		//alert('responseText:' + xmlHttpObject.responseText);
		document.getElementById('speedResultTable').innerHTML=xmlHttpObject.responseText;
		
		//$('#speedResultTable').flexigrid({height:auto});
	} // end if
} // end function
 
/**
 * Get speed data.
 */
function getSpeed()
{
	alert("startTimeToBeSent: " + startTimeToBeSent + 
			", endTimeToBeSent: " + endTimeToBeSent + 
			", pairIdToBeSent: " + pairIdToBeSent
		);
	document.getElementById('speedResultTable').innerHTML='<tr><td><img src="img/ajax-loader.gif"></td></tr>';
	
	alert("xmlHttpObject:" + xmlHttpObject);
	
	xmlHttpObject.open("GET", 
			'getSpeed.jsp?startTime=' + startTimeToBeSent + 
			'&endTime=' + endTimeToBeSent + 
			'&pairing=' + pairIdToBeSent, true);
					
	
	alert("call handle response");
	
	// This line will be called when we receive our AJAX response.
	xmlHttpObject.onreadystatechange = handleResponse; 		
 
	xmlHttpObject.send(null);	
} // end function

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Question by:rnicholus
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5 Comments
 
LVL 18

Expert Comment

by:Hube02
ID: 24861491
Attached is the function that I use and I've not had it fail in any testing.
    function createXmlHttpRequestObject() {
      // create new XMLHttpRequest Object
      var xmlHttp == false;
      
      // will store the reference to the XMLHttpRequest object
      // this should work for all browsers except IE6 and older
      try {
        // try to create XMLHttpRequest object
        xmlHttp = new XMLHttpRequest();
      }
      catch(e) {
        // failed to create XMLHttpRequest object
        // assume IE6 or older
        var XmlHttpVersions = new Array("MSXML2.XMLHTTP.6.0",
                                        "MSXML2.XMLHTTP.5.0",
                                        "MSXML2.XMLHTTP.4.0",
                                        "MSXML2.XMLHTTP.3.0",
                                        "MSXML2.XMLHTTP",
                                        "Microsoft.XMLHTTP");
        // try every prog id until one works
        for (var i=0; i<XmlHttpVersions.length && !xmlHttp; i++) {
          try { 
            // try to create XMLHttpRequest object
            xmlHttp = new ActiveXObject(XmlHttpVersions[i]);
          } 
          catch (e) {}
          // failed to create object
          // do nothing and try the next
        }
      }
      // return the object
      // returns false if we were unable to create any object
      return xmlHttp;
    }

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0
 
LVL 82

Expert Comment

by:hielo
ID: 24862339
copy and paste the following:
var xmlHttpObject = getXmlHttpRequestObject();
 
/**
 * Create XMLHttpRequestObject.
 **/
function getXmlHttpRequestObject()
{  
        var xmlHttp=null;
        try
        {    
                alert("// Firefox, Opera 8.0+, Safari");    
                xmlHttp=new XMLHttpRequest();    
        }
        catch (e)
        {       alert("// Internet Explorer");    
                try
                {             
                        xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");      
                }
                catch (e)
                {      
                        try
                        {        
                                xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
                        }
                        catch (e)
                        {        
                                alert("Your browser does not support AJAX!");        
                                return false;        
                        } // end catch
                }   // end catch
        }  // end catch
        
        alert("xmlHttp:" + xmlHttp);
        
        return xmlHttp;
} // end function
 
/**
 * Called when the AJAX response is returned
 **/ 
function handleResponse() 
{       
        // Check to make sure our response is ready
        if (xmlHttpObject.readyState == 4) 
        {       
                //alert('responseText:' + xmlHttpObject.responseText);
                document.getElementById('speedResultTable').innerHTML=xmlHttpObject.responseText;
                
                //$('#speedResultTable').flexigrid({height:auto});
        } // end if
} // end function
 
/**
 * Get speed data.
 */
function getSpeed()
{
        alert("startTimeToBeSent: " + startTimeToBeSent + 
                        ", endTimeToBeSent: " + endTimeToBeSent + 
                        ", pairIdToBeSent: " + pairIdToBeSent
                );
        document.getElementById('speedResultTable').innerHTML='<tr><td><img src="img/ajax-loader.gif"></td></tr>';
        
        alert("xmlHttpObject:" + xmlHttpObject);
        if(!xmlHttpObject)return false;
	   
        // This line will be called when we receive our AJAX response.
        xmlHttpObject.onreadystatechange = handleResponse;              
 
        xmlHttpObject.open("GET", 
                        'getSpeed.jsp?startTime=' + encodeURIComponent(startTimeToBeSent )+ 
                        '&endTime=' + encodeURIComponent(endTimeToBeSent) + 
                        '&pairing=' + encodeURIComponent(pairIdToBeSent, true));
                                        
        
        alert("call handle response");
        
 
        xmlHttpObject.send(null);       
} // end function

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Author Comment

by:rnicholus
ID: 24871605
Here's what I found. It's very weird:

Keep testing for a while and then the "Unknown Runtime Error" happens here:
document.getElementById('speedResultTable').innerHTML='<tr><td><img src="img/ajax-loader.gif"></td></tr>';

Then I tried removing the "tr" and "td":
document.getElementById('speedResultTable').innerHTML='<img src="img/ajax-loader.gif">';
Suddenly the problem disappear.

I put the "tr" and "td" back just out of curiosity. There's no more problem.
I'm confused. =(

0
 
LVL 82

Accepted Solution

by:
hielo earned 2000 total points
ID: 24872264
It's possible that the first time you are using document.getElementById('speedResultTable'), there is no DOM object for that table yet, in which case the error you are describing would occur. For example, if you make the ajax call NOW, and 3 seconds later you dynamically insert the table AND the ajax completes before you insert the table, that's a problem. Another possibility is if your page has NOT finished loading and you try to derefence the table before the table's definition -ex:

WRONG:
<script>
var x = document.getElementById('theTable')
</script>
<table id='theTable'>...</table>
 
OK
WRONG:
<table id='theTable'>...</table>
<script>
var x = document.getElementById('theTable')
</script>

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0
 

Author Comment

by:rnicholus
ID: 24896657
hielo,
thanks for your explanation.
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