Check if the scroll is currently at the bottom - no jQuery

Question

What is the easiest way to check if the window scroll is at the bottom—without using jQuery?

I've come across some methods, but most of them don't work cross browser.

Answer 1

Here is one technique that works across a handful of browsers I tested

window.onscroll = function () {
    var totalHeight = document.documentElement.scrollHeight;
    var clientHeight = document.documentElement.clientHeight;
    var scrollTop = (document.body && document.body.scrollTop)
    ? document.body.scrollTop : document.documentElement.scrollTop;
    if (totalHeight == scrollTop + clientHeight)
        console.log('Bottom');
}