如何得到一个元素的正确偏移量?-jQuery

var $whatever        = $('#whatever');
var ending_right     = ($(window).width() - ($whatever.offset().left + $whatever.outerWidth()));

Reference: .outerWidth()

Maybe I'm misunderstanding your question, but the offset is supposed to give you two variables: a horizontal and a vertical. This defines the position of the element. So what you're looking for is:

$("#whatever").offset().left

and

$("#whatever").offset().top

If you need to know where the right boundary of your element is, then you should use:

$("#whatever").offset().left + $("#whatever").outerWidth()

Just an addition to what Greg said:

$("#whatever").offset().left + $("#whatever").outerWidth()

This code will get the right position relative to the left side. If the intention was to get the right side position relative to the right (like when using the CSS right property) then an addition to the code is necessary as follows:

$("#parent_container").innerWidth() - ($("#whatever").offset().left + $("#whatever").outerWidth())

This code is useful in animations where you have to set the right side as a fixed anchor when you can't initially set the right property in CSS.

Brendon Crawford had the best answer here (in comment), so I'll move it to an answer until he does (and maybe expand a little).

var offset = $('#whatever').offset();


offset.right = $(window).width() - (offset.left + $('#whatever').outerWidth(true));
offset.bottom = $(window).height() - (offset.top + $('#whatever').outerHeight(true));

Alex, Gary:

As requested, here is my comment posted as an answer:

var rt = ($(window).width() - ($whatever.offset().left + $whatever.outerWidth()));

Thanks for letting me know.

In pseudo code that can be expressed as:

The right offset is:

The window's width MINUS
( The element's left offset PLUS the element's outer width )

Actually these only work when the window isn't scrolled at all from the top left position.
You have to subtract the window scroll values to get an offset that's useful for repositioning elements so they stay on the page:

var offset = $('#whatever').offset();


offset.right = ($(window).width() + $(window).scrollLeft()) - (offset.left + $('#whatever').outerWidth(true));
offset.bottom = ($(window).height() + $(window).scrollTop()) - (offset.top + $('#whatever').outerHeight(true));

Getting the anchor point of a div/table (left) = $("#whatever").offset().left; - ok!

Getting the anchor point of a div/table (right) you can use the code below.

 $("#whatever").width();

There's a native DOM API that achieves this out of the box — getBoundingClientRect:

document.querySelector("#whatever").getBoundingClientRect().right