JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<ul id="playlist">
    <li>foo</li>
    <li>bar</li>
    <li>bla</li>
    <li>blub</li>
</ul>
</body>

JavaScript

$("#playlist li").on("click", function(event) {
    alert($(this).index());
});