How to determine if vertical scroll bar has reached the bottom of the web page?

Question

The same question is answered in jQUery but I\'m looking for solution without jQuery. How do you know the scroll bar has reached bottom of a page

I would like to kno

Answer 1

I just read through the jQuery source code, and it looks like you'll need the "pageYOffset". Then you can get the window height and document height.

Something like this:

var yLeftToGo = document.height - (window.pageYOffset + window.innerHeight);

If yLeftToGo is 0, then you're at the bottom. At least that's the general idea.