JSFiddle - React, Tailwind, and code Playground

HTML

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JavaScript

$(document).ready(function () {

    'use strict';

    var lastScrollTop = 0,
        st,
        direction;

    function detectDirection() {
    
        st = window.pageYOffset;
        
        if (st > lastScrollTop) {
            direction = "down";
        } else {
            direction = "up";
        }
        
        lastScrollTop = st;
        
        return  direction;
        
    }

    $(window).bind('scroll', function() {
    
        detectDirection();
        console.log(detectDirection());
        
    });
    
});