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Asked: 2026-05-11T14:00:21+00:00

I’ve got a Classic ASP application that relies on session; if the user leaves

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I’ve got a Classic ASP application that relies on session; if the user leaves a screen idle and then runs a form post or other operation, I’d like to know whether the session has expired.

Currently I’m checking session in each page to see if it’s timed out, but is there a better, dynamic, JavaScripty approach that will do what banks do and time out sessions with a notification and redirect to login?

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1 Answer

  1. During your page’s onload event, start a timer, and then redirect the page after N seconds.

    • For the timer, use the window.setTimeout function.
    • For the redirect, set the value of window.location.

    Reusable Example:

    <head> <script type='text/javascript'> <!--  function redirect(url) {    window.location = url;  }  function beginSessionTimer() {    // 30000ms = 30s    window.setTimeout(redirect, 30000,                       'http://www.yoursite.com/login.asp?session=clear');  } //--> </script> </head> <body onload='beginSessionTimer();'> </body>

    Quick-n-dirty Example w/ an inline function:

    <body onload='window.setTimeout(function(){ window.location='http://www.yoursite.com/login.asp?session=clear';},  30000);'>

    Note that if your page performs any AJAX calls, that keeps the session alive, so you’ll want to reset the timer using the clearTimeout method (combined w/ a new call to setTimeout). For details on clearTimeout, click here for excellent documentation from Mozilla.)

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