jQuery Select Array in a Selector

So I'm working on a Greasemonkey UserScript for Clients From Hell http://clientsfromhell.net/ and I'm stuck on something.

The script allows a user to navigate through posts on the page using the J and K keys. I'm tr开发者_JAVA技巧ying to mimic the site http://9gag.com/ navigation. There are 10 posts on the page and each of them have the class post so I thought a simple selector would work and give me the posts in an array. This is how I want the code to work:

postScroll = $('.post')[post].offset().top - 25;

So far I've been doing this and it's been working,

postScroll = $('.post:nth-child(' + post + ')').offset().top - 25;

I just wanted to know if there's a right way of doing what I tried in my first code.

You can use .eq(index) like this:

postScroll = $('.post').eq(post).offset().top - 25;

This gets the jquery object representing the index in the matches array that you passed in. Doing $(selector)[index] or $(selector).get(index) both get the DOM element, not the jQuery object, which you'll need for .offset().