Validating a form with javascript

If you are validating form data with javascript, then remember that this should be one of two checks that you do with the data.

You should also have some back-end processing to ensure that the data is in the right format that you want, so if people have javascript turned off or are able to bypass the checks then you are able to ensure that you get the data that is required in the right format from the user: particularly important when you need an address in a specific format, for instance.

Re : Validating a form with javascript

Yes Javascript should be used as one of two systems to check input, it is very useful though as it ensures that you can give instant feedback on wrong data entered. I think many people who get as far as submitting a form and then realise the input is wrong don't bother resubmitting so potentially you lose their input!