JSFiddle - React, Tailwind, and code Playground

HTML

<div id="lodaDiv" hidden="true"  class="hideUnhidePanel">
    <div class="showOnload">
    </div>
    <div class="showOnload">
    </div>
    <div class="showOnload">
    </div>
</div>

<div id="lodaDiv" hidden="true"  class="hideUnhidePanel">
    <div class="showOnload">
    </div>
    <div class="showOnload">
    </div>
    <div class="showOnload">
    </div>
</div>

<div id="lodaDiv" hidden="true"  class="hideUnhidePanel">
 
</div>

JavaScript

$('.hideUnhidePanel').each(function() {
alert('yo');
if($(this).children('showOnload'))
    alert('child exist');
    
});