Getting the left property of an LI element in jQuery?

I have a dynamic list of LI's inside of a UL.

I am trying to somehow be able to 'track' the last LI of the UL which has a class of Last.

I thought if I could test for the left property of the actual LI against some number, say -500, then I could do what I need to do.

The issue is I 开发者_StackOverflow社区can't seem to get that property.

Is this even possible or does the parent (UL in this case) override that?

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If you want the left position relative to the page, you could do this:

var left = $('ul li.Last').offset().left;

Or relative to its parent, do this:

var left = $('ul li.Last').position().left;

• http://api.jquery.com/offset/
• http://api.jquery.com/position/

Example: http://jsfiddle.net/7Ztns/