JSFiddle - React, Tailwind, and code Playground

HTML

<input id="rb1" type="radio" name="rb" checked="true">
<input id="rb2" type="radio" name="rb">

JavaScript

$("input[name=rb]").change(function () {
    if ($('#rb2').is(":checked")) {
        alert('checked');
    } else {
        alert('unchecked');
    }
});