approvejs
ApproveJs
A simple validation library that doesn’t interfere
ApproveJs doesn’t automatically attach itself to input change events or form submit events. It also doesn’t manipulate the DOM for you by automatically displaying errors. This allows you to automate validation how you want.
With a single method (approve.value()), you can decide how to handle validation.
If you like to be in control or have a little OCD like me, ApproveJs is for you.
Read documentaion here.