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Web Matters When using Javascript for form validation, there is a right way, a wrong way, a very wrong way, and a suicidally wrong way! Unfortunately many sites use one of the wrong ways, including even some which claim to be form-validation tutorials. This page tries to help people in the right direction. The suicidally wrong way is to have the validation in Javascript only, and not on the server. A malicious user can easily bypass it and – depending on what you are doing – may wreak havoc with your database. The essence is thus that Javascript validation is always optional. Having said that, there are actually two right ways, of which the better one is hardly ever used! Acceptable: validate the entered data when the submit button is pressed. Example Here is an example of how Javascript validation should work.
It doesn't actually have any server script, so anything you type will be discarded on submission. <P> Javascript is not currently enabled on your browser. How it works Conclusion.