Often there is a scenario where the user displays a live page that polls the
data from server every few seconds to update some contents on page. In case, the user
leaves for hours without shutting down the browser. As a result, the
page keeps on sending requests, generating a significant—and
useless—workload for the server.
On the server,
there's session timeout, but in AJAX there's also the client session
that matters. To detect the end of a client session, you need to check
whether there was user activity such as clicking and tapping for a given
amount of time.To
detect the end of a session based on a timer, set up a client timer
that expires after a specified number of seconds, stops the ongoing task, and pops up an alert box. If the user
responds to the prompt, processing resumes as usual. This example update the datetime every 3 seconds and then show confirm dialog box every 10 seconds to ask the user.
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| Client Session Timeout |
