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HTML Form Validation
Validating HTML forms is a usability issue, if there are required fields, those fields should be checked or validated. There are many ways to validate form entries, from JavaScript to CGI to ASP.
Form Validation
Learn how to do form validation with JavaScript or CGI and the pros and cons of each method. Validating forms is a useful tool in Web development.
Protect Your Forms from Spam
Spammers are ubiquitous and since most of them use autmoated systems, they can fill up a contact us form almost before you've posted it live. While nothing is fool-proof, there are some things you can do to make it harder for a spammer to submit your form but that your readers won't notice. Learn how to protect your forms from spammers.
How Do You Protect HTML Forms from Spam - CAPTCHAs and Other Methods
Spam is ubiquitous on the Web, and if you put up an email address or HTML form, within a few days someone will hit it with a robot and start sending you spam. How do you protect your HTML forms from spammers? There are lots of different ways of protecting your forms. Find out what others use and share your own successes.
Can I require that some fields be filled in?
Frequently asked questions about forms and how to use them.
Free Form Validation Class - JavaScript @ About.com
In 8 weeks learn all you need to know to validate your HTML forms. From the About.com Guide to JavaScript.