How do I get the scroll position of a document?

Here's how to get the scrollHeight of an element obtained using a jQuery selector:

$(selector)[0].scrollHeight

If selector is the id of the element (e.g. elemId), it is guaranteed that the 0-indexed item of the array will be the element you wish to select, and scrollHeight will be correct.

$(document).height() //returns window height

$(document).scrollTop() //returns scroll position from top of document

If you are using Jquery 1.6 or above, use prop to access the value.

$(document).prop('scrollHeight')

Previous versions used to get the value from attr but not post 1.6.

document.getElementById("elementID").scrollHeight

$("elementID").scrollHeight