Prevent form from being submitted twice
Solution 1
You should perform a REDIRECT to a page with a message that the data was inserted... and a back button to go to the form again (if you want to)...
To redirect using PHP
use the header
function:
header('Location: http://www.example.com/');
Solution 2
Perform a redirect after the data is inserted to a confirmation page (can be done with header(), which should clear out the POST data and allow for refreshing without duplicating content.
Solution 3
In the case of user having lag and he hits the submit button a few times, then maybe use client side mechanism, use js to set the submit button to disabled once it is clicked. but will have to display message saying roughly something like, "sending message ... if no response pls reload page and retry".
Comments
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Alex almost 2 years
I have a simple php form, like this:
<?php if(isset($_POST['myform'])) // email... else // display form
the problem is that if I refresh the page after I submit the form, it gets submitted twice. How can I prevent this from happening?
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BalusC over 13 yearsThis is by the way called the Post-Redirect-Get pattern.
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Alex over 13 yearsthanks. but now I have another problem :) I added
header('Location: http://www.example.com/?formsent=1');
, and I'm checking for$_GET['formsent']
to display a success message. The problem is that if I refresh the page I get the same success message :) -
Garis M Suero over 13 yearsand the problem is?... i don't see it as a problem, as it doesn't manipulate any data on the DB.
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amaster over 10 yearssometimes the simplest answers are the best because most people including myself tend to over complicate matters. Thanks!
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rayryeng about 7 yearsPlease give some explanation as to what is going on in the code. Code dumping is frowned upon here.