Execute VB.NET Function from JavaScript Function

[Mike555]

I'm trying to build a javascript function which executes an existing vb.net function in the current page. I can't find any examples of how to do this, so I'm totally stuck. Could someone please give me some advise on how to accomplish this?

<script language="JavaScript">
  window.onbeforeunload = BackToHTTP;
  function BackToHTTP()
  {
    [b]RUN VB.NET FUNCTION HERE[/b]
  }
</script>

Specifically, I'm trying run a function when the user exits the current webpage, using the preexisting javascript onbeforeunload function.

Thanks.

 

[jbenson001]

You can't do that. JavaScript is client side code. You cannot invoke server side code from there.

 

[Mike555]

ok - thanks

 

[jbenson001]

No problem...

 

[BoulderBum]

Sure you can, just use AJAX! It's all the rage!

Check this out:

http://ajax.schwarz-interactive.de/csharpsample/default.aspx

All of the functions he uses on the page call server-side code without ever posting back.

Within Framework 2.0, there's also the concept of client callbacks, but it's not really as mature as some of the other third-party AJAX libraries (nor can you use it with Framework 1.*:

http://www.dotnetjunkies.com/Tutorial/E80EC96F-1C32-4855-85AE-9E30EECF13D7.dcik