Just a quick question - how would i be able to autmatically clear the form once submitted so that if they click on back it doesnt keep their info in the form? Im running competitions and it just makes it so easy for people to enter 400 times in a hour.
What you need to do is to have the result page create a cookie on the users machine. A simple random or sequential number. This same number will be stored in a database to enable validation .
Step 2 is to add a validation to your form that reads the cookie from the users pc and checks it with the database before submitting the form.
Step 3. If the cookie exists in the database and the users pc then the user is informed that he has filled in the form already and that he needs to fill it in again before submitting it.
