JAVASCRIPT

scroll down up js

var lastScrollTop = 0;

// element should be replaced with the actual target element on which you have applied scroll, use window in case of no target element.
element.addEventListener("scroll", function(){ // or window.addEventListener("scroll"....
   var st = window.pageYOffset || document.documentElement.scrollTop; // Credits: "https://github.com/qeremy/so/blob/master/so.dom.js#L426"
   if (st > lastScrollTop){
      // downscroll code
   } else {
      // upscroll code
   }
   lastScrollTop = st <= 0 ? 0 : st; // For Mobile or negative scrolling
}, false);

javascript scroll up-down event

window.onwheel = e => {
  if(e.deltaY >= 0){
    // Scrolling Down with mouse
    console.log('Scroll Down');
  } else {
    // Scrolling Up with mouse
    console.log('Scroll Up');
  }
}
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