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.