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POASP.NET Session fails to renew itself
 

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  1. POASP.NET Session fails to renew itself
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    <p>I've been tasked with adding functionality to an ASP.NET 4.0 Web Forms application to warn the user shortly before their session ends, and to provide the option either to continue the session, or to end the session. </p> <p>I have implemented this via a confirmation dialog box which warns the user that the session is going to end soon and giving the option of pressing 'OK' to continue the session, or pressing 'Cancel' to end the session. </p> <p>On pressing 'cancel', the page redirects to the logout page. </p> <p>On pressing 'OK', I invoke a JQuery GET request on an empty ASPX page in my application (KeepAlive.aspx). As I understand, when a user makes a request to the page, ASP.NETshould take care of renewing the session - and thus resetting the session timeout. </p> <p>However, I found that when the user presses OK, the session is not extended, and so it times out. This is despite the GET request apparently being successful (e.g. the callback function is invoked). </p> <p>The code I used to implement this exists as a JavaScript function which gets invoked via the <code>onload</code> event on the master page - so it's inherited by all the other pages in the application. </p> <pre><code>var intervalID; /* Set a timeout interval based on the server timeout value (-10%) */ function setTimeoutInterval() { /* Session timeout warning dialog */ // Get session timeout value var timeoutMins = "&lt;asp:ContentPlaceHolder id='timeoutPlaceholder' runat='server'&gt;&lt;%= Session.Timeout %&gt;&lt;/asp:ContentPlaceHolder&gt;"; // Subtract 10% of the timeout value - to give the user a chance to continue the session before it expires var remainingTimeMins = Math.ceil(timeoutMins * 0.1); var timeoutMins = timeoutMins * 0.9; // Convert the timeout value to milliseconds var timeout = timeoutMins * 60 * 1000; // Set javascript timeout intervalID = window.setInterval("displayTimeoutDialog(" + remainingTimeMins + ")", timeout); } /* Display a dialog prompting the user to continue the current session or to end the session */ function displayTimeoutDialog(remainingTimeMins) { var result = confirm("The session will end in ~" + remainingTimeMins + " minute(s). Press OK to continue, or Cancel to log out."); if (result == true) { // Keep the session alive alert("Keep alive!"); $.get("KeepAlive.aspx", function() { alert("Successful request"); }); } else { // Redirect to the logout page window.location.href("Logout.aspx"); } } </code></pre>
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    1. USCiaran Gallagher
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    1. COWhy are you setting a JavaScript variable to an asp server control... and then multiplying that by .9?
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      1. POASP.NET Session fails to renew itself
      1. USMikeSmithDev
    2. CO@Mike He's not setting it to a server control. His code will be rendered as: "var timeoutMins = 20" or whatever the setting is. He then multiplies it by .9 so the dialog pops up before the session actually expires.
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      1. USStefan
    3. COYep, the comments explain it. I'm just getting the server timeout value from the server (e.g. 20 minutes), then setting an interval to warn the user prior to the session expiring (20 * 0.9 = 18 mins, so the warning will become 2 minutes prior to the session expiring).
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      1. USCiaran Gallagher
 

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