JSFiddle - React, Tailwind, and code Playground

HTML

<ul>
    <li class="commonClass" data-id="item1">whatever</li>
    <li class="commonClass" data-id="item2">whatever</li>
</ul>

<div class="anotherCommonClassForDivs" id="item1">data for item1</div>
<div class="anotherCommonClassForDivs" id="item2">data for item2</div>

JavaScript

$('.commonClass').click(function() {
    $('.anotherCommonClassForDivs').fadeOut("fast");
    $('div#' + $(this).data('id')).fadeIn("fast");
});