xmlhttp , client hangs . Need to implement some kind of timeout. : xmlhttp, client hangs . Need to implement some kind of timeout.

May 10, 2008 01:44pm pdt

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03.27.2008 at 12:36PM PDT, ID: 23275348 | Points: 500

	[x] Attachment Details

xmlhttp , client hangs . Need to implement some kind of timeout.

Zone: Active Server Pages (ASP)

Tags: xmlhttp, client hangs . Need to implement some kind of timeout.

I am using Microsoft.xmlhttp to send a request to the server. We have been seeing intermittent problems where we client locks up or hangs because of network issues. I am looking for some kind of timeout that I can use at client side script. Note that Iam using synchronous call.
Any ideas?

         
           
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             function SendData(method,url,data,ErrHow,Format)
{
var http = new ActiveXObject("Microsoft.XMLHTTP");
var ResultXML;
var e;
    
http.open(method, url, false);
http.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
http.setRequestHeader("Content-Length", data.length);
try {
	http.send(data);
	if(Format == 0) {
		return http.responseText;
	} else {
		return http.responseBody;
	}
} catch(e) {
	return CreateError(e.number, e, ErrHow);
}
}

           
         

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Question Stats

Zone: Web Development

Question Asked By: svinodkumar

Question Asked On: 03.27.2008

Participating Experts: 1

Points: 500

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The Asker has requested that this question be deleted.

03.27.2008 at 01:45PM PDT, ID: 21225574

Rank: Wizard

hielo:

Try the code below:

         
           
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             function SendData(method,url,data,ErrHow,Format)
{
	var http = new ActiveXObject("Microsoft.XMLHTTP");
	var ResultXML;
	var e;
     http.onreadystatechange=function(){ 
		if(http.readyState==4)
		{
			if( Format==0 )
				processIt(http.responseText)
			else
				processIt(http.responseBody)
		}
	}
	http.open(method, url, true);
	http.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
	http.setRequestHeader("Content-Length", data.length);
	try 
	{
		http.send(data);
	}
	catch(e) 
	{
		return CreateError(e.number, e, ErrHow);
	}
}
function processIt(data)
{
	alert(data);
}

           
         

Open in New Window

03.27.2008 at 02:41PM PDT, ID: 21226048

svinodkumar:

This is asynchronous way of communicating to server, which MAY not work for me. If there is any way that my function "SendData" can return message to caller then this will be helpful. Basically the function
function processIt(data)
{
alert(data);
}
can it do something like, returning the data to orginal caller?

Also to mention, Iam using this asp code as a communication layer between my ActiveX client and web-server.
I have ActiveX client application which raises events and goes to ASP, and ASP contacts server to get or send data.

03.27.2008 at 02:55PM PDT, ID: 21226159

Rank: Wizard

hielo:

OK. Try this:

         
           
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             var http=null;
function SendData(method,url,data,ErrHow,Format)
{
http = new ActiveXObject("Microsoft.XMLHTTP");
var ResultXML;
var e;
    
http.open(method, url, false);
http.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
http.setRequestHeader("Content-Length", data.length);
try {
	setTimeout("killIt()",5000);
	http.send(data);
	if(Format == 0) {
		return http.responseText;
	} else {
		return http.responseBody;
	}
} catch(e) {
	return CreateError(e.number, e, ErrHow);
}
}
 
function killIt()
{
http.abort();
http=null;
}

           
         

Open in New Window

03.27.2008 at 02:57PM PDT, ID: 21226185

Rank: Wizard

hielo:

NOTE: this:
setTimeout("killIt()",5000);
is intended to kill the current request 5 seconds after the request is sent. Since you are using synchronous calls, you cannot put that statement after http.send(data);

You can change from 5 seconds to whatever suits your needs. Notice that the argument is in milliseconds, so if you wanted to wait 15 secs. you would need 15000 instead.

03.27.2008 at 03:06PM PDT, ID: 21226249

svinodkumar:

GREAT!!!
It worked in my system without any issues, need to try with actual scenario where it locks up the client.

Also, changed the function a little bit:
function killIt()
{
      if (http != null) {
            http.abort();
            http=null;
      }
}

Change: checking for null in KillIt function, as I was getting an error on lower left corner of borwser "http is null"

03.27.2008 at 04:03PM PDT, ID: 21226617

svinodkumar:

Is there a way to clear timer, as i may get the response before timer runs , so will need to clear the timer

Will following code work?

         
           
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             var http;
var timedOut;
function SendData(method,url,data,ErrHow,Format)
{
     http = new ActiveXObject("Microsoft.XMLHTTP");
     var ResultXML;
     var e;
     var timerID;
                
     http.open(method, url, false);
     http.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
     http.setRequestHeader("Content-Length", data.length);
     try {
          timedOut = false;
          timerID = setTimeout("killIt()",15000);
          http.send(data);
          if(Format == 0) {
               return http.responseText;
          } else {
               return http.responseBody;
          }
          clearTimeout(timerID);
     } catch(e) {
          if (timedOut) {
               return CreateError(-1,'HTTP Request Timed Out',ErrHow);
          } else {
               clearTimeout(timerID);
               return CreateError(e.number, e, ErrHow);
          }
     }
}
 
function killIt()
{
     if (http != null) {http.abort();}
     timedOut = true;
}

           
         

Open in New Window

03.27.2008 at 08:17PM PDT, ID: 21227758

Rank: Wizard

hielo:

>>if (http != null)
Good catch!

>>Will following code work?
Yes! The only thing I would do different is move the cleatTimeout() immediately after http.send(data);
since it is a synchronous request. Also, it's good practice to always initialize your variable to some known value. That way you are less likely to run into unexpected result (like 'undefined' values).

         
           
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             var http=null;
var timedOut=false;
function SendData(method,url,data,ErrHow,Format)
{
     http = new ActiveXObject("Microsoft.XMLHTTP");
     var ResultXML;
     var e;
     var timerID;
                
     http.open(method, url, false);
     http.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
     http.setRequestHeader("Content-Length", data.length);
     try {
          timedOut = false;
          timerID = setTimeout("killIt()",15000);
          http.send(data);
          clearTimeout(timerID);
          if(Format == 0) {
               return http.responseText;
          } else {
               return http.responseBody;
          }
     } catch(e) {
          if (timedOut) {
               return CreateError(-1,'HTTP Request Timed Out',ErrHow);
          } else {
               clearTimeout(timerID);
               return CreateError(e.number, e, ErrHow);
          }
     }
}
 
function killIt()
{
     if (http != null) {http.abort();}
     timedOut = true;
}
           
         

Open in New Window

03.27.2008 at 09:10PM PDT, ID: 21227963

svinodkumar:

Thanks hielo.
Let me try out in actual "buggy" network and update you with my results.

04.16.2008 at 12:45PM PDT, ID: 21371289

svinodkumar:

Hi ,
Came to know that this solution won't work because Java Scripts are not multithreaded. Can you please comment on this.Thanks.

04.22.2008 at 10:49AM PDT, ID: 21413643

Rank: Wizard

hielo:

>>Came to know that this solution won't work because Java Scripts are not multithreaded
OK. So? What behaviour are you seeing and what behaviour do you want? I know javascript is not multithreaded but that does not tell me what's the nature of your problem.

04.22.2008 at 10:53AM PDT, ID: 21413684

svinodkumar:

I use VB Client side ActiveX control. I raiseevent in vb code which goes to ASP script and there I make contact with weberver. The script that I showed , Iam able to open a connection but because of network issues the send request never gets completed. This is because it is waiting for responsed from server, and we loose some packets when serve is repsonding, so client waits and waits and waits.......till eternity :-) This is what I want to stop. Client should time out.

04.24.2008 at 05:24PM PDT, ID: 21436282

svinodkumar:

Hielo, do u have any comments to add for this?

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