XMLHttpRequest object

Server.CreateObject("Microsoft.XMLHttp") gives an error$0 $0Create XmlHttp Error=006~ASP 0177~Server.CreateObject Failed~800401f3$0 $0 Here is actual code...$0 Set xmlConn = Server.CreateObject("Microsoft.XMLHttp")$0 $0 $0 $0 if err.number <> 0 then$0 Response.Write "Create XmlHttp Error=" & err.Description$0 Response.End$0 end if$0 $0 $0 $0 $0 $0

Hi Masters,
I have accidentally found out that in some version of IE6, it doesn't support onreadystatechange property. Please advise if there is any workaround for this. Although I have used the code provided above, it doesn't seems to solve the issue.

function getXMLHttpRequest() {
    if (window.XMLHttpRequest) {
        return new window.XMLHttpRequest;
    }
    else {
        try {
            return new ActiveXObject("MSXML2.XMLHTTP.3.0");
        }
        catch (ex) {
            return null;
        }
    }
}

Let me highlight the fact that adding just a header without specifying value is ignored by this class: after adding

MyRequest.setRequestHeader("SOAPAction", "")

the SOAPAction header won't show up in the actual HTTP request going on the wire. Just saying...

Greetings,

I'm having trouble getting the following code to work in IE. It works in firefox without a problem.

I think my problem is at the  xmlHttp.open("GET", url, true); in the code below but not totally sure. I'm trying to get information from a form and update the information to the database. I'm able to get the information from the screen but the information is not getting the page which receiving the request and to the database.

Any help would be appreciated.

// JavaScript Document
var geturl = "http://www." + window.location.hostname + "/demo";
function getMessageResponse()
{
 var getdate  = document.getElementById('fm_tt_date').value;
 var gettime  = document.getElementById('fm_tt_time').value;
 
 if(getdate == "MM/DD/YY" || gettime == "HH:MM")
 {alert("Please fill out times, or click the set button.")}
 else
 {
 var xmlHttp;
 try 
  { 
  // Internet Explorer
  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
  }
 catch (e) 
  { 
  
  try  
   {
   // Firefox, Opera 8.0+, Safari 
   xmlHttp=new XMLHttpRequest();
   } 
  catch (e)   
   {  
   try    
    {     
    xmlHttp= new ActiveXObject("MSXML2.XMLHTTP.3.0");
      }   
   catch (e)     
    {     
    alert("Your browser does not support AJAX!");     
    return false;     
    }   
   } 
  } 
 
 var getdate  = document.getElementById('fm_tt_date').value;
 var gettime  = document.getElementById('fm_tt_time').value;
 var getprojid = document.getElementById('fm_project_idnum').value;
 var getsubuser = document.getElementById('fm_create_user').value;
 
 for (var i=0; i < document.psheetform.fm_tt_stend.length; i++)
     {
     if (document.psheetform.fm_tt_stend[i].checked)
        {
        var getstend = document.psheetform.fm_tt_stend[i].value;
        }
     }
  
 var url= geturl+"/content/process/recordtime.php"; 
 url=url+"?getdate="+getdate+"&gettime="+gettime+"&getstend="+getstend+"&getprojid="+getprojid+"&getsubuser="+getsubuser;  
 url=url+"&sid="+Math.random();
 
 xmlHttp.open("GET", url, true);
 
 xmlHttp.onreadystatechange=function()   
  {   
  if(xmlHttp.readyState==4)     
   {
   if(document.psheetform.fm_tt_stend[0].checked)
    {
    document.psheetform.fm_tt_stend[0].checked=false;
    document.psheetform.fm_tt_stend[1].checked=true;
    }
   else
    {
    document.psheetform.fm_tt_stend[0].checked=true;
    document.psheetform.fm_tt_stend[1].checked=false; 
    }
   alert(getstend+" time of "+getdate+", "+gettime+" was recorded");
   }   
  }
  
 xmlHttp.send();
 
 }
}

insertTR("31935","IOA_Call","969|0","2010-10-15 19:45:00");
insertTR("31736","IOA_Call","968|0","2010-10-15 19:44:00");
insertTR("31546","IOA_Call","946|0","2010-10-15 10:16:00");
insertTR("31424","IOA_Call","945|0","2010-10-15 9:51:00");
insertTR("31279","IOA_Call","941|0","2010-10-15 9:15:00");
insertTR("31150","IOA_Call","935|0","2010-10-14 14:53:00");
insertTR("30840","IOA_Call","920|0","2010-10-14 9:11:00");
insertTR("30700","IOA_Call","919|0","2010-10-14 8:47:00");
insertTR("30642","IOA_Call","912|0","2010-10-13 15:46:00");
insertTR("30523","IOA_Call","903|0","2010-10-13 15:11:00");
insertTR("30308","IOA_Call","900|0","2010-10-13 15:01:00");
insertTR("30084","IOA_Call","899|0","2010-10-13 14:31:00");
insertTR("29861","IOA_Call","898|0","2010-10-13 14:30:00");
insertTR("29555","IOA_Task","1;2010-10-13 11:25:00,2010-10-13 11:25:00,101,5795","2010-10-13 11:25:00");

insertTR("29347","IOA_Call","875|0","2010-10-12 11:47:00");
function insertTR(Callid,CallType,CallContent,CallTime)
{
    
    var X=new ActiveXObject("Microsoft.XMLHTTP")
    X.onreadystatechange=function()
    {
        if(X.readyState==4)
        {
            if(X.status==200)
            {
                var strR=X.responseText;
                if(strR!="")
                {
                    noReadDiv.innerHTML=post_http("<div>xxx</div>");
                }
            }
        }
    }
    X.open('POST',"xxxURL",true);
    X.send("xxPostData");
}

Refresh the IE8 several times,A runtime error occur  in the line: noReadDiv.innerHTML=SF_func_post_http("<div>xxx</div>");.
finally I get the reason,becase post_http is a sync xmlhttprequest use XMLHttpRequest() as the constructor ,which is different
from var X=new ActiveXObject("Microsoft.XMLHTTP")。

Can you please explain the reason,and tell a way to solve this??
Thanks!!

In response to the "bug" wherein one request will wait for another to finish ... $0$0 $0 $0To the best of my knowledge, most web browsers only allow themselves up to 2 simultaneous connections to a given host.  So, if you start 2 AJAX requests, any attempt to open a 3rd will get stuck waiting for one of the first 2 to complete.  And if you have any images, scripts, or stylesheets in queue, your AJAX requests could be stuck waiting for those as well.$0 $0$0 $0 $0But again, this only applies if these requests are all coming from the same server.  And I'm not 100% sure whether the determining factor there is IP address or hostname.  In any case, this could be the "bug" you're seeing.$0

I have been trying to solve a problem with the asynchronous xmlhttprequest call.

I call a Perl program that will sleep for a random number of seconds (0-15) and return the number of seconds that the perl program slept. I am using the request to call the program 3 times.

The onreadystatechange function updates 3 separate DIVS on the webpage with the time that the readystate changed.

Sometimes, not every time, one call will wait (readystate=3) for another call to finish.

Code example:

function g() {
for (var i=0; i<3; i++) {
getResults(i)
}
}

function getResults(divId) {
var x = new XMLHttpRequest();
x.open("GET",<URL>,true);
x.onreadystatechange = function() {
var now = new Date();
document.getElementById('div' + divId).innerHTML += x.readyState + ": " + now.toLocaleTimeString() + "<br>";
if (x.readyState == 4) {
document.getElementById('div' + divId).innerHTML += 'Slept for ' + x.responseText + ' seconds';
}
}
x.send()
}

If you send a XMLHttpRequest to the server using the GET method, and the server responds with an emply text (Content-Length=0), IE7 and IE8 send the request again, so you will see two calls instead of one, on your server's log. Normaly you don't want to respond with a zero length page, however in some cases such as an invalid parameter or other kind of error you may want to notifiy the JScript about the error without having to send a whole bunch of useless text. No other web browser behaves like this, so it must be a bug. This does not happen is you use the POST method.

if (window.XMLHttpRequest)
{
   var oReq = new XMLHttpRequest();
   oReq.open("GET", "http://localhost/test.xml");
   oReq.send();
   alert(oReq.statusText); // fails
}

The request is asynchronous, it will run only after the calling current script completes.


[[jsudds.MSFT]] Thanks for reporting! The code samples in the article above have been updated, but I'm leaving your example here in the event that it might help someone to see why their code is not working as expected.

Getting the right ProgID for XMLHTTP is important. It turns out that there are only two real options, and you should know the difference between them. Check out the blog post on this subject at the Microsoft XML Team's WebLog.

http://blogs.msdn.com/xmlteam/archive/2006/10/23/using-the-right-version-of-msxml-in-internet-explorer.aspx

Hi:

I am facing a problem in ajax.

My code functionality is retrieving data from database. For it i am using ajax.

i am including the code below which contains ajax function:

<script>
var req;
var which;
function fetchCorpClassTaxonomy(url) {
alert("entered into Ajax function");
if (window.XMLHttpRequest) { // Non-IE browsers
alert("NON IE Block is Invoked");
req = new XMLHttpRequest();
req.onreadystatechange = processStateChange;
try {
req.open("GET", url, true);
} catch (e) {
alert(e);
}
req.send(null);
} else if (window.ActiveXObject) { // IE
alert("entered into IE block");
req = new ActiveXObject("Microsoft.XMLHTTP");
if (req) {
alert("entered into if(req)");
req.onreadystatechange = processStateChange;
req.open("GET", url, true);
alert("readystate: "+ req.readyState);
req.send();
}
}
}
function processStateChange() {
alert("entered into processStateChange()");
if (req.readyState == 4) { // Complete
if (req.status == 200) { // OK response
... STUFF REMOVED ...;
}
} else {
alert("Problem: " + req.statusText);
}
}
}
</script>

I am getting response from action class so there is no problem in my other code.

when fetchCorpClassTaxonomy(url) function is called it is going to IE block since i am using IE 7.0

After that
alert("readystate: "+ req.readyState);
is also coming.

but the function processStateChange() is not called.
The alert just inside the function :

alert("entered into processStateChange()"); is also not executing.


The problem is function processStateChange() is not called.


Please give me your valuable suggestions As Soon As Possible for solving the problem. Since i am new to Ajax I am not able to find the solution.

Thanks.....


[[jsudds.MSFT]] On IE, XMLHttpRequest object properties are reset when you call the open method. The onreadystatechange handler you just set on the line above is thrown away. Just switch the order of those two lines.

TO RECAP: Calling the open method initializes the request object. If you have set properties (such as onreadystatechange) it is reset to initial default values (NULL). So, do all your initialization between OPEN and the final call to SEND.

CLASS T3REQ4CALL4BACK
DIM M3REQ
PUBLIC DEFAULT PROPERTY GET HANDLER
IF M3REQ. READYSTATE = &O4 THEN MSGBOX M3REQ. STATUSTEXT,, "STATUS"
END PROPERTY
END CLASS

SET A3REQ = WINDOW. XMLHTTPREQUEST. CREATE
A3REQ. OPEN "HEAD", "http://msdn.microsoft.com/"
A3REQ. SEND
SET A4CALL4BACK = NEW T3REQ4CALL4BACK
SET A4CALL4BACK. M3REQ = A3REQ
A3REQ. ONREADYSTATECHANGE = A4CALL4BACK
REM AMAZINGLY, "SET" IS NOT NEEDED AND FAILS HERE

REM REMINDER: DO NOT WAIT FOR THE REPLY HERE, 
REM IT WILL NOT ARRIVE AS LONG AS YOUR SCRIPT IS BUSY!

Two things that may be obvious but that are overlooked. May be helpful.

1. POST works properly with multiple requessts to the same object. GET does not. So try POST when you experience problems.
2. Returning values from a function that uses a request object may result in the caller proceeding before the callee is ready to return a value. For correct operation the callee needs a loop or event to delay/synchronize to the callee completion.

It seems that there's also an issue with load balancing (using the IIS load balancer) and NTLM authentication on IE. Basically, you either get prompted to log in, or nothing happens at all (and an error is thrown: "The download of the specified resource has failed."

I've also seen this happen when using AJAX resources through a router or firewall that requires NTLM authentication.