Capturing the “scroll down” event?

Question

I\'m designing a very simple web page (HTML only), the only \"feature\" I want to implement is to do something when the user scrolls down the page, is there a way to capture

Answer 1

/**
 * This function will determine if a client mousewheel is scrolling up or down.
 */
  //window.addEventListener("load", eScroll);

  function eScroll() {

      window.addEventListener('mousewheel', (event)=> {

        let originalEvent = event.wheelDeltaY;

        if (event.wheelDeltaY >= 0) {
            console.log('Scroll up');
        }
        else {
            console.log('Scroll down');
        }
    });
  }

  window.addEventListener("load", scrollDown);

  function scrollDown() {

      window.addEventListener('mousewheel', (event)=> {

     if (event.wheelDeltaY <= 0) {
        console.log(event.wheelDeltaY);
        console.log('Mousewheel has scrolled down');
      }
   })
  }

  window.addEventListener("load", scrollUp);

  function scrollUp() {

      window.addEventListener('mousewheel', (event)=> {

      if (event.wheelDeltaY > 0) {
        console.log(event.wheelDeltaY);
        console.log('Mousewheel has scrolled up');
      }
  })

  }