[Javascript] dreaded back button click after a form POST?

[Mike Dougherty]

We put a hidden form field as a timestamp the form is generated, and keep that value on the server 
(i know using session is bad, etc. caveats understood)

When the form is submitted the first time, the keys match - then the server-side token is deleted. 
 The second time the form is submitted (from the browser's cached copy of the page) the timestamp 
doesn't match, and i return a message telling the user that we've prevented submission from an 
expired page.  You could probably regenerate the form using the submitted values, prompt them to 
confirm that they really want to submit an old page (possibly generating another order)


On Mon, 2 May 2005 21:29:42 +1000
  Chris Harrison <chrisharrison.com.au at gmail.com> wrote:
>Howdy,
>
>I'm wondering how people have solved the dreaded back button click
>after a form POST?  You know when you click the back bottun after a
>form submit and the browser prompts something to the effect of "this
>will cause a page submission".
>
>Cheers,
>Chris.
>http://chrisharrison.com.au
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