[thelist] POSTDATA & CFML

Douglas Williams douglas at ourwilliamsfamily.com
Mon Feb 25 18:47:51 CST 2002

----- Original Message -----
From: "Carlos Carter" <ccarter at amnh.org>

> So here's the problem.  I have the user submit data through a form
> and then I write a file that contains this data.  Finally I output
> it.  So the user sees the content of the file and then if s/he
> reloads the page this alert will pop up in NN6 for mac:
> "The page you are trying to view contains POSTDATA that has expired
> from cache.  If you resend the date, any action the form carried out
> (such as search or online purchase) will be repeated.  To resend the
> data, click OK.  Otherwise, click Cancel"
> If the user clicks 'OK' then the file is written again and the
> original data is appended.  This is a problem because this data
> should only be found once in the file.  If the user clicks cancel we
> are led nowhere.  Does anybody know how to prevent this using CFML?
> Thanks,
> Carlitos

I don't know of an easy way to detect the header to stop the double-posting,
but one way around is a method I always try to follow.  Instead of
outputting the file on the action page, just use a cflocation to another
page with a URL variable to another page which outputs the same data without
the threat of double-posting.


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