JSFiddle - React, Tailwind, and code Playground

HTML

<div id="divElement">
<input type="radio" name="radioName" value="1" /> 1 <br />
<input type="radio" name="radioName" value="2" checked /> 2 <br />
<input type="radio" name="radioName" value="3" /> 3 <br />
</div>

JavaScript

alert($('#divElement input[type="radio"]:checked').val());