calculate page height javascript code example

Example 1: 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 );

Example 2: get total height of page javascript

var _docHeight = (document.height !== undefined) ? document.height : document.body.offsetHeight;