Validate.js is a very nice JavaScript lightweight form validation library that is inspired from the CodeIgniter form validation API.
The library is lightweight (~1kb gzipped), doesn’t require any JavaScript frameworks and works in all major browsers (yes, including IE6).
Validation rules that are used frequently like numeric, required, e-mail, less/greater than, etc. are already included and it can be extended with new, custom rules.
It has support for chainable declarations for easily using multiple rules on a single input field.
And, although there are hard-coded warning messages for each rule, they can be overridden with a method provided.\
Requirements: No Requirements
Compatibility: All Major Browsers
Website: http://rickharrison.github.com/validate.js/
Download: https://github.com/rickharrison/validate.js
