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How to prevent user from hitting refresh button


samantha_chan1

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How could i prevent a user from hitting the refresh button in the browser?

If the user hit the refresh button, the data will then be posted to database as a new record with a new primary key which i have set it as an auto increment primary key. How can i avoid this from happening?

what is the difference between using (1)include "hello.php" and (2) header (Location:"hello.php");?
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As an extra from Prismatic, you can disable or remove the submit button [in a form] after its been clicked to prevent users clicking it more than once but for this you'd need to add a little javascript to hide it once pressed - surprised how many people keep clicking adding more data on a slow connection.
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