JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-2.2.4.min.js"></script>
<body>
    <form>
        Input: <input type="text" name="userInput" id="userInput" autofocus><br>
        <input type="button" value="Submit" name="Submit" id="submit">
    </form>
</body>

JavaScript

$(document).ready(function() {
        $('#submit').on('click', function(){
        	alert($('#userInput').val());
        });
    });