Form validation

Question

I need to create a form that has many of the same fields, that have to be inserted into a database, but the problem I have is that if a user only fills in one or two of the

Answer 1

It's good to use javascript for form validation, but you shouldn't rely on it. The first thing to do is to check the values in $_POST in PHP, and make sure they're something valid looking (or at the very least, check that they're not "").

To check with javascript, you would put an onSubmit="..." in the form tag, which returns false if the form data is invalid (meaning "don't submit the form"). And you'd also probably want an alert, or you could modify the page somehow to indicate the problem. I'm not going to write out a form validation script for you though.