On Aug 13, 2007, at 2:16 PM, Richard Lynch wrote:
Of course, the question of whether it's a Good Idea to show something
different for a manual Refresh versus META refresh springs to mind...
I can't see why you'd want to do this for anything other than
educational purposes...
Well, as the OP, I can first tell you all that I don't actually need
to do this anymore quite like this. Basically, what I was trying to
accomplish was that I have an application that has access to
sensitive student data (like grades and stuff), and I wanted to write
it so that it would log you out and display a different screen after
a specified period of time.... just in case the instructor walked
away from their computer we didn't want it displaying whatever the
instructor was last looking at forever.
So what I was doing was refreshing the page every 31 minutes and
comparing with the last time the page was accessed (set via a session
variable), and if longer than 30 minutes, it would log you out and
show you a login form rather than the page you were looking at. The
problem came in the fact that if you had 2 windows open
simultaneously, the PHP couldn't tell if it was the background window
or the front window doing the loading, so therefore it would never
log you our.
The solution, which came to me from some of the early comments, was
to create a new page that the META refresh sent to (logout.php) and
then anytime you hit that page, it logs you out. So if the background
or foreground window now refreshes and gets sent to that page.
Thanks everyone for their help on this.
--
Kevin Murphy
Webmaster: Information and Marketing Services
Western Nevada College
www.wnc.edu
775-445-3326
P.S. Please note that my e-mail and website address have changed from
wncc.edu to wnc.edu.
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