JSFiddle - React, Tailwind, and code Playground

by Puddster

HTML

<div class="contentDiv">&nbsp;</div>
<div class="bigDiv" style="background-color: red">One</div>
<div class="bigDiv" style="background-color: blue">Two</div>
<div class="bigDiv" style="background-color: green">Three</div>

CSS

.bigDiv {
    height: 100%;
    width: 100%;
    position: fixed;
    top: 100%;
    left: 0px;
    font-size: 10em;
    font-weight: 900;
    text-align: center;
}

JavaScript

var curScroll = $("html").scrollTop();

$(document).ready(function() {
    $(".contentDiv").css("min-height", $(window).height() * 2 );
    
    $("html").scrollTop(function() {
        if ($(this).scrollTop > curScroll) {
            alert("Scrolled Down");
        } else {
            alert("Scrolled Up");
        }
        curScroll = $(this).scrollTop();
    });
});