distanceToBottom.js

scrollHandler = () => {
  // Get the element
  const ele = $(this._container);
  
  // Compare these two metrics to get the distance scrolled from the bottom
  const metricA = ele[0].scrollHeight - ele.scrollTop();
  const metricB = ele.outerHeight();
  
  const distanceFromBottom = metricA - metricB;
  console.log(`distanceFromBottom: ${distanceFromBottom}`);
}