preventing the "do you want to resubmit data" button when you hit back

sparwani

I want users on my site to be able to submit a form and then if they decide to choose back not to get a warning that says "if you click ok then the form data will be resubmitted".

basically i want the page to either be reloaded from cache or fresh from the website but i dont want the form data to be resubmitted. how do i get this to work?

bogu

After submit, u keep your POST data in a session and redirect the script ...

timus

Hey

I believe another way to get round this is to use get instead of post on your form method. Then you don't have to worry about storing stuff in the session but you do have to make sure you can pick you the info your sending from the $GET array rather than the $POST array

Kind regards

Tim

sparwani

bogu wrote:
After submit, u keep your POST data in a session and redirect the script ...

thats the only way?

i was thinking maybe you send some no-reload or cache-expire kinda thing in the header?

bretticus

I have been using the following method for years (allbeit there are opposing philosophies on this subject, however I have never suffered any significant disadvantage):

I always submit a script to itself. Look something like the following:

<?
$errors = array();
if ( isset($_POST['button']) ) {
	//check for errors
	if ( empty($_POST['randomfield']) )
		$errors['randomfield'] = "Please enter something!";
	if ( count($errors) == 0 ) {
		//process form ...
		//...
		// redirect to confirm page...
		if ( !headers_sent() ) {
			/* 99.9999% of the time no headers have been sent and 
				user is redirected to a success page that they can 
				reload all day and never get the repost message. */
			header("Location: /confirmpage.php");
		} else {
			// this is just a failsafe.
			echo "Everything was submitted just fine.";
		}
	}
}
?>
<html>
<body>
<form method="POST" action="<?=$_SERVER['PHP_SELF']?>">
<input type="text" name="randomfield" value="<?=$_POST['randomfield']?>">
<? echo $errors['randomfield']; ?>
<input type="submit" name="button" value="Go">
</form>
</body>
</html>

Cheers!