Solved

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

Posted on 2009-07-15
5
800 Views
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

Open in new window

0
Comment
Question by:rnicholus
  • 2
  • 2
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;

    }

Open in new window

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

Open in new window

0
 

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 500 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>

Open in new window

0
 

Author Comment

by:rnicholus
ID: 24896657
hielo,
thanks for your explanation.
0

Featured Post

What Is Threat Intelligence?

Threat intelligence is often discussed, but rarely understood. Starting with a precise definition, along with clear business goals, is essential.

Join & Write a Comment

OverviewThis article demonstrates a simple search form using AJAX. The purpose of the article is to demonstrate how to use the same code to render a page and javascript (JQuery) and AJAX to make subsequent calls to refine the results. The princip…
I found this questions asking how to do this in many different forums, so I will describe here how to implement a solution using PHP and AJAX. The logical flow for the problem should be: Write an event handler for the first drop down box to get …
Sending a Secure fax is easy with eFax Corporate (http://www.enterprise.efax.com). First, Just open a new email message.  In the To field, type your recipient's fax number @efaxsend.com. You can even send a secure international fax — just include t…
Here's a very brief overview of the methods PRTG Network Monitor (https://www.paessler.com/prtg) offers for monitoring bandwidth, to help you decide which methods you´d like to investigate in more detail.  The methods are covered in more detail in o…

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

20 Experts available now in Live!

Get 1:1 Help Now