JSFiddle - React, Tailwind, and code Playground

by Alfie

HTML

Add another director <input type="checkbox" id="checkbox1"/>
<div id="autoUpdate" class="autoUpdate">
content
</div>

JavaScript

$(document).ready(function () {
    $('#checkbox1').change(function () {
        if (!this.checked) 
        //  ^
           $('#autoUpdate').fadeIn('slow');
        else 
            $('#autoUpdate').fadeOut('slow');
    });
});