Validity is a simple jQuery plug-in for powerful, accurate client-side form validation Instead of writing validation manually or balancing some unwieldy server-side framework, validity allows you to design client-side validation in a manner that feels natural and straightforward. It is well-organized, versatile jQuery plug-in that easily tackle any validation problem.
It is easy to learn and Simple to use validation scenarios, but it’s also designed to cleanly and naturally tackle more complicated, dynamic or conditional validations. The plug-in also give total control over how validation messages appear, so you can easily adapt the way validation errors are displayed to the look and feel of your site.
User can also takes advantage of jQuery’s Selector engine to perform validation on logical groupings of inputs, making it declarative and clean. This means that the inputs on a page can be added, removed, or changed and validation will still work without reconfiguration.