JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test" style="height:100px;width:70px;overflow:auto">
    sadfsadf
    
    saf
    sadf
    saf
    s
    af
    saf
    saf
    sadf
    sadfsafsafsaf
    sadfsaf
    
    sadfsafsadf
    
    sadfsaf
    sa
    dfsa
    fsadf
</div>

JavaScript

var el = $('.test');

alert(el.scrollTop());

el.on('scroll', function(){
    
  alert(el.scrollTop());
    
    
});