JSFiddle - React, Tailwind, and code Playground

by kboucher

HTML

<form id="formId">
    <input type="text" id="mytextbox" />
</form>

JavaScript

$(document).ready( function () {
    alert( $('#formId input').hasClass('invalid') );
    $('#formId input').addClass('invalid');
    alert( $('#formId input').hasClass('invalid') );
});