Scroll percentage, infinite scroll

scroll-detection.js

// This code is for infinite scrolling, which we may or may not implement

var wrapper = $('.test-scroll-wrapper');
var content = $('.test-scroll-content');

window.wrapper = wrapper;
window.content = content;

wrapper.on('scroll', function(){
  var marginTop = Math.round(parseFloat(content.css('marginTop')));
  var marginBottom = Math.round(parseFloat(content.css('marginBottom')));
  var height = content.height() + marginTop + marginBottom - wrapper.height();
  var pos = wrapper.scrollTop();
  var percent = pos / height;
})