Abort page execution

[choche]

Hi, i'm trying a code to update a html div using ActiveX or
XMLHttpRequest from client side and a asp.net page that retrieve data.
The asp.net page is a loop for some seconds and then i do it again the
request.

My javascript from client side is like this:

function Tracking(U,M,V){
var a=window.ActiveXObject?new window.ActiveXObject('Microsoft.XMLHTTP'):new XMLHttpRequest;
try{a.open(M,U,true);a.send(V);}catch(c){a=null;alert('Exception: '+c);}return a;
}

var MyRequest=Tracking('async/mypage.aspx?_r'+(Math.random()*999).toString(),'get',null);

function Abort(){MyRequest.abort();}
function ViewRequest(){
/*
Some code
MyRequest.responseText ....
*/
}

And the server side:

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim StartDate As Date = Now

While Now.Subtract(StartDate).Seconds < 15
' Response.Write (something)....
Response.Flush()
Response.Clear()
System.Threading.Thread.Sleep(50)
End While

End Sub

Now, when i try abort the page request by client side, i call the function Abort and the request is stopped but mypage.aspx still in
execution to complete the operation for some seconds. How i do it to stop the execution before 15 seconds by client script?
any idea on how I can do this?

Thanks

 

[jmeckley]

1st. i would use a js library like jquery to manage the ajax infrastructure. not only does it handle browser variances, it's a much cleaner api.

as for stopping the call, you can't. once the http request is sent you cannot stop it. abort will stop the ajax request from waiting for a response.

something else to consider. if this is an ajax call you will not need the entire webforms page life cycle to handle the request. consider using a PageMethod or calling an http handler (ashx). they do not require the overhead of a webform (aspx).

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190
faq732-7259

 

[choche]

Thanks Jason for reply to me. I dont knowed "page methods", i'll search the correct
way to implement the same but with ashx.

Thanks again

 

[choche]

Hi again,

I solved the trouble using Response.IsClientConnected. When it given False I get out loop and that's all

 

[jmeckley]

nice.

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190
faq732-7259