LiveValidation is a small open source javascript library for making client-side validation quick, easy, and powerful. It comprises of two main parts. Firstly, it provides developers with a rich set of core validation methods, which can also be used outside the context of forms. Secondly, it provides your visitors with real-time validation information as they fill out forms, helping them to get it right first time, making the forms easier, quicker and less daunting to complete.

Two versions are provided - a prototype.js version (ideal for use with Rails), and a standalone version (for using with any other javascript framework). Both are fully tested on most modern browsers with a comprehensive test suite.

» LiveValidation - Validate As You Type