I think you should have a ajax submit on change of the form fields and
only accept changes server side before the time expires. You do not
need a timer. You only need to calculate the time difference between
begin and last ajax submission.

if the server does not accept an ajax submit because time expires you
can trigger a redirect on the client to notify the user.

rote:
> I am creating an application which can simulate on-line examination
> (similar to GRE). The problem that I am encountering is how to time
> out a test , say after, t minutes . The issues involved are:-
>
> 1) The script needs to check the time and should trigger automatic
> form self submission after t minutes .
> 2) The script need not be executed at all if the user has already
> submitted the form before the time-out .
> 3) I have to maintain the clock on the server side and not the
> client .
>
> Can you please guide me as how to go about it ?
>
> Thanks in advance ,
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