How to detect in a javascript function that the page is about to postback

[tarun.kataria]

Hi all,

In my ASP.NET application, I am trying to detect in a javascript
function, which is triggered by the event onbeforeunload, that if the
window is getting closed beacuse its a post back or if the user has
clicked the X button of the browser. Is there a way in javascript to
know that a postback is about to happen i.e. the user has clicked a
button (asp.net control).

thanks

 

[Bruce Barker]

there is no supported method. the most common trick is to check the mouse
coordinates, they will be negative for the close button.

-- bruce (sqlwork.com)

 

[James Doughty]

Not sure if this is what you're wanting but it works great:
http://aspnet.4guysfromrolla.com/articles/042005-1.aspx