Question

How do i make these two ajax responses completely seperate...

Asked by: Laride

Hi, wondered if someone can help me...

i have a page, which i need to dynamically update using xmlhttp object.

The ajax page itself is running a wscript.shell Ping command, to check certain servers are responding...  The Problem: As each ping command can take quite a time to resolve (if the server is off line) i need each command to happen independantly. So i can run an onLoad function, and each result will be returned as and when the result comes back. Due to the amount of pings, they cannot be sequential (one function after another)

The code i have so far creates two objects, and runs 2 commands.... yet i get each response 3 seconds after the last, they appear to be running sequencially.

Im pulling my hair out on this one. i cant see where the issue is. surely i can run multiple requests at once? and surely the same ajax page (with a different query string) can be accessed simultaneusly?

Please help!

Cheers

ajaxPing.asp
 
<%
 
response.Expires = -1
 
	Set ShellObject = CreateObject("WScript.Shell")
	Set CommandObject = ShellObject.Exec("ping " & Request("Address"))
	PingResult = CommandObject.StdOut.Readall()
	
	
	If InStr(PingResult,"TTL=") > 0 Then 
		MyResponse = "Success"
	Else
		MyResponse = "Fail"
	End If
	
	Response.Write(MyResponse & "<br /><br />" & Replace(PingResult, vbCrLf , "<br>"))
 
%>
 
Main Page :
 
<%@LANGUAGE="VBSCRIPT" CODEPAGE="65001"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>
 
<body>
 
 
<script>
ajaxFunctionRef = 0
 
 
	function RunPing(SiteAddr) {
	SaveURL = "ajaxPing.asp?address="+SiteAddr
	
	var xmlHttp;
  	try {xmlHttp=new XMLHttpRequest();}
  		catch (e) { 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;
		        }}}  
	xmlHttp.onreadystatechange=function()
  	 	{ if(xmlHttp.readyState==4) {
			// Ajax Response Code - use xmlHttp.responseText for returned response.Write() commands
			try {
				document.getElementById("output").innerHTML = xmlHttp.responseText
			
			} catch (e) {alert('Sorry, there is an error in the AJAX Response.\n\nError Description : ' + e.description);
							document.getElementById("output").innerHTML = xmlHttp.responseText;
							}
		}}//End Response Function');
	xmlHttp.open("GET",SaveURL,true);
    xmlHttp.send(null);  
	}
	
	
	function RunPing2(SiteAddr) {
	SaveURL = "ajaxPing.asp?address="+SiteAddr
	
	var xmlHttp2;
  	try {xmlHttp2=new XMLHttpRequest();}
  		catch (e) { try { xmlHttp2=new ActiveXObject("Msxml2.XMLHTTP");}
    		catch (e) { try {xmlHttp2=new ActiveXObject("Microsoft.XMLHTTP");} 
				catch (e) { alert("Your browser does not support AJAX!");        
				return false;
		        }}}  
	xmlHttp2.onreadystatechange=function()
  	 	{ if(xmlHttp2.readyState==4) {
			// Ajax Response Code - use xmlHttp.responseText for returned response.Write() commands
			try {
				document.getElementById("output").innerHTML = xmlHttp2.responseText
			
			} catch (e) {alert('Sorry, there is an error in the AJAX Response.\n\nError Description : ' + e.description);
							document.getElementById("output").innerHTML = xmlHttp2.responseText;
							}
		}}//End Response Function');
	xmlHttp2.open("GET",SaveURL,true);
    xmlHttp2.send(null);  
	}
</script>
<div style="width:500px; height:200px; border:1px solid #cccccc;">
<div style="margin:3px; float:left; padding:4px; border:1px solid #cccccc" onclick="RunPing('192.168.1.1');RunPing2('localhost');">Ping</div>
</div>
<div id="output"></div>
</body>
</html>

                                  
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Asked On
2009-10-12 at 01:40:42ID24803900
Tags

Ajax

,

Asp

,

javascript

,

wscript.shell

Topics

Asynchronous Javascript and XML (AJAX)

,

Active Server Pages (ASP)

,

Miscellaneous Web Development

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: jkdt0077Posted on 2009-10-12 at 04:37:31ID: 25550263

Your code looks fine to be honest. Perhaps this is your problem:

Of course. However, you may not be able to send one request per XMLHTTPRequest object at the same time. Limits on allowed HTTP connections may force the second request (whichever request is made first [that is not which corresponding object is created first] would become the first one) into a queue. Internet
Explorer is known to be especially restrictive on the number of HTTP connections; for example Gecko-based UAs allow you to increase that value through a user preference.

Have you tried using any other browsers?

 

by: LaridePosted on 2009-10-12 at 06:36:57ID: 25551083

Fair comment.... i thought something like this may be the case... i have however just tried it in firefox and i have the same behaviour. even to the extent that if i press the ping button twice, i get four responses, all 3 seconds after each other... this using the same objects twice, and still creating a queue.

Could it be anything to do with a) using a shell command? i can only run one instance at a time? or b) my session is only allowed to access the same file with one connection? even though its a different query string?

Thanks anyway... its a strange one!

 

by: jkdt0077Posted on 2009-10-12 at 08:11:06ID: 25551915

I don't really know enough about Shell objects to comment on that part of it however, I would be fairly sure that you can access the same file at the same time with multiple http objects. I have done this before myself. It may well be a case that the shell interface is causing the delay but as I say I don't know enough about that to be certain.

 

by: jkdt0077Posted on 2009-10-12 at 08:12:38ID: 25551931

In fact, thinking about it.. when you send a ping command to the shell does it not take about 3 seconds(ish) to complete?

 

by: LaridePosted on 2009-12-07 at 09:11:31ID: 31639954

wasnt really solved

20120131-EE-VQP-002

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