How to get maximum document scrolltop value

Question

I am making some plugin and I need to get maximum scrollTop value of the document. Maximum scrollTop value is 2001 , but $(docum

Answer 1

In vanilla Javascript I'm currently doing this:

getScrollTopMax = function () {
  var ref;
  return (ref = document.scrollingElement.scrollTopMax) != null
      ? ref
      : (document.scrollingElement.scrollHeight - document.documentElement.clientHeight);
};

This returns Gecko's non-standard scrollTopMax if it exists, otherwise calculates it. I'm using document.scrollingElement here, which only exists on particular browsers, but it's easy to polyfill.