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Asked: 2026-05-11T05:58:59+00:00

I need a client-side script to confirm that the Timer’s OnTick event can proceed.

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I need a client-side script to confirm that the Timer’s OnTick event can proceed.

How do I invoke CanContinue() before the Timer1 postback occurs?
How do I cancel the postback if user selects Cancel?

<%@ Page Language='C#' %> <script runat='server'>     protected void Timer1_OnTick(object sender, EventArgs e)     {         Response.Write('Last Postback: ' + DateTime.Now.ToString());     } </script> <html xmlns='http://www.w3.org/1999/xhtml'> <head runat='server'>     <title>Timer Test</title>     <script type='text/javascript' language='javascript'>         function CanContinue() {             return confirm('The page is requesting new data.  Ok or Cancel?');         }     </script> </head> <body>     <form id='form1' runat='server'>         <asp:ScriptManager ID='ScriptManager1' runat='server' />         <asp:Timer ID='Timer1' runat='server' OnTick='Timer1_OnTick' Interval='300000' />     </form> </body> </html>

NOTE: Some readers might take issue with showing a modal confirmation every x minutes. I would agree that this is poor for usability, but I’m not in a position to change the design.

UPDATE: I decided not to use a Timer after all. See this post for details on an alternative solution.

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  1. I decided not to use a Timer after all. See this post for details on an alternative solution.

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