JSFiddle - React, Tailwind, and code Playground

by gromer

HTML

<form id="formId">
    <input type="text" value="Hey" />
    <input type="text" id="b" value="Hola" />
</form>

<div id="c"></div>

JavaScript

if ($('#formId input').hasClass('invalid')) {
    $('#c').append('Found<br />');
} else {
    $('#c').append('Not found<br />');
}

$('#b').addClass('invalid');

if ($('#formId input').hasClass('invalid')) {
    $('#c').append('Found<br />');
} else {
    $('#c').append('Not found<br />');
}