avoid multiple form submittion

souravsasi

Hi,

i used form with post method. i want to avoid the form submitting once again when pressing the refresh button after the form submittion.

1.submitting a form
2.if i press a refresh button, the form shouldn't submit once again

can you help me?

trexx

try out to do a redirect after you have handled the submitted data.

header( "location: formpage.php" );

that should work.

souravsasi

i want to submit the form once,even if i press the refresh button.
no need to redirect another page.

trexx

you don't redirect to another page... you redirect to the same page =) the submitted data get lost then... and if you click refresh, it just loads the page again.

an example:

<?php
if( isset($_POST['mydata']) )
{
	saveData($_POST['mydata']);
	header( "location: {$_SERVER['PHP_SELF']}" );
	exit();
}
?>
<html>
	<body>
		<form action="<?=$_SERVER['PHP_SELF']?>" method="post">
			<input type="text" name="mydata"> <input type="submit">
		</form>
	</body>
</html>

souravsasi

i'm submitting the form,this is my result url

http://domain.com/file.php?value=1&value2=2

i'm caching this page..so if i press back button nothing will happend,i'll get the cached result page..suppose if i refresh that cache page,my form is submitting once again.

how to make sure that form will submit only once

superwormy

You cannot reliably do this without a redirect.

Period.

Read what was already posted.

wscreate

Javascript may help you in this instance. Visit the following URL to view info about using javascript to help reduce "re-submits" by a form user.

http://javascript.internet.com/forms/submit-once.html

nightowl

one other thing you could do is setting a unique, hidden value in the form and before saving the information to your database, checking whether the unique value is already in there. If it is, you have a double post and you can ignore the rest of the form...

trexx

yeah! let's do it complicated! 😃

how about a "I hereby declare that i have never submitted this form before" checkbox on the form? :rolleyes: