How to get offset() relative to parent in jQuery?

Question

This gives me the position of some element from the left edge of the main window:

$(\'#bar\').offset().left;

If that element is situated in

Answer 1

It's simple enough: get the offset of the element and substract the offset of its parent.

var elem = $("#bar");
var offset = elem.offset().left - elem.parent().offset().left;