horizontal-scroll.js

const el = document.querySelector('#scroller');

function scrollHorizontally(e) {
  e = window.event || e;
  e.preventDefault();
  el.scrollLeft -= (e.wheelDelta || -e.detail);
}

function init() {
  if (!el) {
    return;
  }

  if (el.addEventListener) {
    el.addEventListener('mousewheel', scrollHorizontally, false);
    el.addEventListener('DOMMouseScroll', scrollHorizontally, false);
  } else {
    el.attachEvent('onmousewheel', scrollHorizontally);
  }
}

export default init;