how to get full window height when there is a scroll bar?

Question

var window_height = $( window ).height(); this is giving current window height not the full height including scroll height. I want full window height including scroll height.

Answer 1

You should check this link: How to get height of entire document with JavaScript?

    var body = document.body,
    html = document.documentElement;

var height = Math.max( body.scrollHeight, body.offsetHeight, 
                       html.clientHeight, html.scrollHeight, html.offsetHeight );

Answer 2

As of 2020 the best way to find the height of an entire document is:

document.documentElement.scrollHeight

Credit: this answer on another question.