It is quite essential to have input validations in the server side form processing script. Having the right set of validations prevent bad data entering your database. Form validations can, to some extend, prevent hacking attacks too. The PHP form validation script contains a set of commonly required form validations. Using this script, it is quick and easy to add form validations to your PHP form processor. Save yourself from repetitive coding of common form validations. Documentation and code samples are included in the download.
JS AFv - automatic form validation
SharePoint Form Validation 1.7.507.2
do sharepoint form validation to an item.
Add powerful processing to any web form
Fill forms software. Auto fill forms IE.