Scroll Direction Fn

scroll-direction.js

const main = {};
const updateScroll = () => {
    main.winScroll = $(window).scrollTop();
    if (!main.winScrollMem) {
        main.winScrollMem = 0;    
    }
    if (main.winScroll > main.winScrollMem) {
        main.winScrollDir = 'down';
    } else {
        main.winScrollDir = 'up';
    }
    main.winScrollMem = main.winScroll;
};