JSFiddle - React, Tailwind, and code Playground
HTML
<form id="form1" action="" method="post">
<label><input type="radio" name="test" value="1"/> Test 1</label>
<label><input type="radio" name="test" value="2"/> Test 2</label>
<br/><br/>
Value: <span id="val">?</span>
</form>
JavaScript
$('input[name=test]').change(function() {
$('#val').html($('#form1 input:radio:checked').val());
});