On 9/13/06, afan@xxxxxxxx <afan@xxxxxxxx> wrote:
sorry, but didn't get this one. could you please elaborate it a little bi
to me?
thanks.
> On 9/13/06, afan@xxxxxxxx <afan@xxxxxxxx> wrote:
>>
>> Hi,
>> Could somebody explain to me what to do to skip this message I'm
getting
>> after I search for some products on my page, got the list of products,
>> selected a detailed view of the product and click on the Back button of
>> the browser to see again list of found products (result page):
>> "The Page you are trying to view contains POSTDATA that has expired
from
>> cache. If you resend the data, any action the form carried out such as
a
>> search or online purchase) will be repeated. To resend the data, click
>> OK.
>> Otherwise, click Cancel."
>>
>> Thanks for any help.
>>
>> -afan
>>
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>>
>> If you add a header redirect [header('Location:');] after your script
> processes the POST data you can avoid this.
>
Sure..
Say you have form.php. This page will post to process.php. (Just an
example. Having form.php post to itself is fine too and how I always do my
forms since on error I redisplay them with filled values)
Inside process.php you might have something like
<?php
if (strtolower($_SERVER['REQUEST_METHOD']) == 'post') {
//do processing here
if ( success ) {
header('Location: http://example.com/thanks.php');
} else {
header('Location: http://example.com/form.php');
} // if
} // if
session_write_close(); // if you're using sessions
exit();
?>
Now when your form posts to process, your script will either go back to the
form.php on error, or thanks.php on success. Because process.php issues a
redirect, this tells the browser to ignore process.php in the history it
saves. If a user clicks the back button it will go to form.php because
process.php returned a 403 header and was "ignored" for lack of a better
word.
Hope that helps!
