Get time left on session until timeout

Question

Is there any way to know how long it is left on the session object before a timeout occurs?

I know how to get the actual timeout from the webconfig, but is there any way to know when the session was last active?

My users will be filling out large forms in my application, and if it takes more than 10 minutes before they hit "submit" they will be logged out. I would like to warn them if the session is about to timeout. I will make the check using an ajax call.

Answer 1

You could also set a JavaScript time-out to the Session time-out via some code behind. Get it to run whatever JavaScript function you want. Very flexible and you don't need to muck about with checking the current time ... etc.

Something like this:

"window.setTimeout('yourJSFunctionGoesHere()', " + Session.Timeout + ");";

If you want to warn 2 minutes before your could does something like:

"window.setTimeout('yourWarningJSFunctionGoesHere()', " + Session.Timeout-2 + ");";

Answer 2

You could track the server time DateTime.Now in a javascript variable.
Compare that against the current time in javascript.

If the difference hits your threshold limit, you can show a warning message in javascript.

Better still, you could fire an ajax call to your server, and this would extend your server timeout.