JSFiddle - React, Tailwind, and code Playground

HTML

<ul id='myid'>  
<li>First</li>
<li>Second</li>
<li>Third</li>
<li>Fourth</li>
<li>Fifth</li>
</ul>

JavaScript

$("#myid li").click(function() {
    alert($(this).prevAll().length+1);
});