Answers for "get document height js"

javascript get body height

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

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

get document height js

let body = document.body, html = document.documentElement, 
    height = Math.max( body.scrollHeight, body.offsetHeight,
                      html.clientHeight, html.scrollHeight, html.offsetHeight );