jQuery Validation plugin: how to check if an element is valid?

Question

A little bit of context:

I\'m using the jQuery Validation plugin to validate a sign-up form. I now want to implement an ajax call to check whether t

Answer 1

This worked for me on JQuery 1.11

$("#userName").keyup(function () {
    if ($(this)[0].validity.valid) {
        // AJAX here
    }
});