Prevent Form Submit Twice

Anon

I have a script that sends an email and updates a file. What is the easiest way to prevent a person from pressing submit twice in one session. If the browser is slow, you automatically repress the submit button and create 2 records. Do I have to use cookies with user and date and time stamp or is there an easier way?

Anon

You can use this script:
<script>

</script>

and do like this:
<form method="post" name="yeah" onSubmit="disableSubmits(this)">
<input type="submit" name="submit" value="Submit">
</form>

just play with it... 🙂
Good luck, Arni

Anon

You could use a session var and set this to "false" once you used your (mysql_)query.

And put the function between an if statement, that only executes if the session var is true.

Once the record is added, the session var is set to false and any other request from that same user would be ignored.

Javascript is a nice way as Arni suggested, but have you seen the stats lately of how many people use their browser with javascript disabled? It's not secure enough if someone wants to flood your database this way, they simply disable their javascript and abuse your form anyway.

HTH,
Martin.

Anon

Thanks for the quick response and the help.

Anon

Another thing you can do (if you don't mind the extra storage space in your table) is to create a unique identifier (using uniqid() or something like that) and incorporate it in your form as a hidden field. Meanwhile in the table, the column receiving this data should have a unique index, so the first insertion will succeed and the second will be prevented by the dbms itself.

Anon

hey i am confused
ok if i want user to only submit once at any
subject but not twice at same subject
i don't know how to do it.
if i register session for particular subject then how to validate, user can't submit at other subject they have to close the window and log on again and choose other subject and submit
confusing please help me