JSFiddle - React, Tailwind, and code Playground

HTML

<!-- Radio buttons to choose signin/register -->
                <fieldset data-role="controlgroup" data-theme="z" data-type="horizontal" >
                    <input type="radio" name="login" id="radio-signin" value="signin" checked="checked" />
                     <label for="radio-signin">Signin</label>
                     <input type="radio" name="login" id="radio-register" value="register" />
                     <label for="radio-register">Register</label>
                </fieldset>

JavaScript

$(document).ready(function() {  
    $("input[@name=login]").change(function(){
      alert($("input[@name=login]:checked").val());
    });     
});