JSFiddle - React, Tailwind, and code Playground

HTML

<form id="myForm">
<input type="radio" class="className" value="A" /> A <br />
<input type="radio" class="className" value="B" /> B <br />
<input type="radio" class="className" value="C" /> C <br />
    <input type="radio" class="className" value="D" /> D <br />
</form>

JavaScript

$('input').on('change', function() {
   alert($('input[type="radio"][class="className"]:checked').val()); 
});