Form submitting twice

[Canman2005]

Hi all

 

I have a simple contact form which is POSTED to a simple email script.

 

At the end of the email script, I have put the following

 

print "<script>alert('Thank you, your message has been sent');</script>";
print "<script>location.replace('index.php?id=25');</script>";
exit;

 

The problem is that once the script has run, if you click the back button, the form seems to want to POST again.

 

Does anyone know why this happens and if I can stop it from happening

 

Thanks

 

Dave

[cooldude832]

Best way to lock a form from double submission is once processing occurs set a session saying the form is submitted so they can't resubmit like

 

Processer.php

<?php
session_start();
if($_SESSION['submitted'] == "yes"){
//Don't double submit 
header("location: form.php?error=double+submit");
}
?>

[AV1611]

You so smart 

[cooldude832]

I should state that if the user properly reopens the form (Say they want to submit another row) you need to reset the session to no

 

[Canman2005]

thank you