[RESOLVED] How to avoid people from going back?

[DanielLiljeberg]

How do I avoid people pressing the back key in the browser to return to a page that just inserted a record into a database? Or that they can't reload it and data get's inserted again. Best practise to avoid this?

[hitman6003]

You can't prevent them from pressing the back button, but you could set a session var that when the data has been inserted, the var is set to true...then check to see if that var = true before doing the insert...if it is, abort the insert, if it's not, then go ahead with it.

[DanielLiljeberg]

Perfect... That would work.. Thanx

[halojoy]

hitman6003 wrote:

You can't prevent them from pressing the back button, but you could set a session var that when the data has been inserted, the var is set to true...then check to see if that var = true before doing the insert...if it is, abort the insert, if it's not, then go ahead with it.

I use the same session thing with a variable
in my contact script, to aviod spam, flooding and 'double posting' by back button or mistake.
Ir works well.
And people have to shut down browser before be able to send me another message.

<?php

function addEntry($name,$email,$comments) {

/* This part will help prevent multiple submissions */
session_start();
if(isset( $_SESSION['add'] ) ) 
     die('You may only submit once per session!<br><br>Thank you');

// Here comes part where message is recorded and stored
// along with name and email, so I can contact them
// save $name, $email, $comments

$_SESSION['add']=1;
?>
<p>&nbsp;</p>
<p><b>Your message was successfully added!</b></p>
<p>Thank you</p>
<?php

exit();
}

?>