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Posted by Marek Kilimajer on 10/20/83 11:16
Robert Meyer wrote:
> "Marek Kilimajer" <lists@kilimajer.net> wrote in message
> news:428A7034.5010607@kilimajer.net...
>
>>Robert Meyer wrote:
>>
>>>Hello,
>>>
>>>Scenario:
>>>1) User is presented a blank form.
>>>2) User fills in form.
>>>3) User submits form.
>>>4) Record is added to database.
>>>5) Back to 1).
>>
>>Go really back to 1) - use redirect. After the record is added to the
>>database, use something like:
>>header('Location: http://yourserver.com/form.php');
>>exit;
>
>
> Does this work for all browsers?
yes.
>
>
>>>All is fine to here.
>>>6) User clicks refresh.
>>>7) Another record is added, same data except auto-increment field.
>>>How do I prevent these last two steps, or at least prevent a record
>>>from being added when refresh is clicked?
>>
>>You should see a message from your browser that data is being reposted.
>
>
> I looked for such a message and the only thing I can find is as follows:
>
> 1) _SERVER['HTTP_ACCEPT'] and _ENV['HTTP_ACCEPT'] and change to "*/*", but I
> don't know if that is the case for all browsers, do you know?
>
> 2) _SERVER['REDIRECT_UNIQUE_ID'] and _ENV['REDIRECT_UNIQUE_ID'],
> _SERVER['REMOTE_PORT'] and _ENV['REMOTE_PORT'], _SERVER['UNIQUE_ID'] and
> _ENV['UNIQUE_ID'] change, but I don't think the values are predictable,
> especially between browsers.
>
> Do you know of a specific message to look for and is that message the same
> for all browsers?
that's a message the user (using the browser) gets from the browser.
Unless you use GET method, but you should really use POST method for
forms that change state on the server.
>
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