Fading gallery script

gallery-fade.js

(function () {
  const items = document.getElementsByClassName('gallery-fade-item');
  let active = 0;
  if(!items || !items.length) return;
  // Don't animate in the editor
  if(document.body.classList.contains('compose-mode')) {
    return [].slice.call(items).forEach(i => setItem(i, 1));
  }
  function setItem(item, val) {
    item.style.opacity = val;
    item.style.zIndex = val;
  }
  setItem(items[0], 1);
  setInterval(() => {
    setItem(items[active], 0);
    active = (active + 1) % items.length;
    setItem(items[active], 1);
  }, 3000);
})()