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Use jQuery to target a class within a div and perform additional changes within the same div

I have the following HTML code:
<div class="pack1">
<a class="optionButton">First option</a>
<a class="optionButton">Second option</a>
<a class="optionButton">Third option</a>
</div>
<div class="pack2">
<a class="optionButton">First option</a>
<a class="optionButton">Second option</a>
<a class="optionButton">Third option</a>
</div>
<div class="pack3">
<a class="optionButton">First option</a>
<a class="optionButton">Second option</a>
<a class="optionButton">Third option</a>
</div>
[...]
<div class="pack10">
<a class="optionButton">First option</a>
<a class="optionButton">Second option</a>
<a class="optionButton">Third option</a>
</div>
Using jQuery I would like to trigger an event on clicking the a tag with the optionButton class but I don't know how to limit the event to the div that the a tag resides in.
For example right now I have something like:
$(document).ready(function(){
$('.optionButton').click(function() {
$(".optionButton").removeClass('checked');
$(this).addClass('checked');
});
});
It works fine for the first selection, lets say when I click the First option in the pack1 div, but if I make another selection, lets say Third option in the pack3 div, the first one will disapear.
Also, there must be only one selected option for each pach.

You need to narrow down the selection of your removeClass, as right now it's selecting every occurrence of optionButton.
$(document).ready(function(){
$('.optionButton').click(function() {
$(this).siblings('.optionButton').removeClass('checked');
$(this).addClass('checked');
});
});
This will narrow it down by selecting siblings of the clicked element that have the class optionButton.
JSFiddle
EDIT: Woops, put the wrong class in there. Should be patched up now.

Because exact DOM structure is highly subject to change, your best bet is to almost always go to the parent and search your way down like so:
1) $(this).parent().find(".optionButton").removeClass("checked");
or you can simplify the selector results set (and make your code slightly more efficient) by saying:
2) $(this).parent().find(".checked").removeClass("checked");
You can also use the selector context parameter like so:
3) $(".checked", $(this).parent()).removeClass("checked");
The difference between 2 and 3 is purely syntactic. jQuery will convert 3 into 2 behind the scenes

I think this could work
$(document).ready(function(){
$('.optionButton').click(function() {
var parent = $(this).closest("div");//getting the parent content
parent.find(".optionButton").removeClass('checked');//remove the checked
$(this).addClass('checked');
});
});

How to execute js code again whenever a class name change?

Sorry for my editting format in advance cos it's been a long time since I asked a question. I will try my best to follow all the rules.
So I have this list which works like an image carousel:
<div class="carousel">
<ul>
<li class="past"><img src="img1.png"/></li>
<li class="past"><img src="img2.png"/></li>
<li class="current"><img src="img3.png"/></li>
<li class="future"><img src="img4.png"/></li>
<li class="future"><img src="img5.png"/></li>
</ul>
</div>
Whenever I click on an image, the clicked item's class name will change to "current" and I will translateX <ul> to make "current" <li> look "centered". All of these are in "carousel" <div>.
However I have another div which has a background of an empty-screen iPhone mockup:
<div class = "iphone_screen">
<div>
<img class="display" src="blank_screen.png"/>
</div>
</div>
and I want to do this to the "iPhone" <div>:
var imgUrl = $("body").find(".current").find('img').attr('src');
$(".display").attr('src',imgUrl);
But this jQuery will only be executed once when I load the page.
So how do I execute my jQuery code again whenever I lick one of the <li> items and make the class name current change?
Update: Thank you all for the replies! I feel so stupid......I don't know why I ask this question.........I added a click function before and it didn't work.Then I started to look for alternatives. Now when I think about it, the selector must be wrong.

Since the event that drives everything comes from a click on the li you could run on a click for any li's (inside a ul) inside the carousel classed div.
$(".carousel > ul > li").click(function () {
var imgUrl = $("body").find(".current").find('img').attr('src');
$(".display").attr('src',imgUrl);
});

put your code in a function.
$(".carousel li").on("click" ,function () {
var imgUrl = $("body").find(".current").find('img').attr('src');
$(".display").attr('src',imgUrl);
});

JQuery - setting an "active" class for image-scroll

I have content loading dynamically (using new WP_query loop in WordPress) for a jQuery carousel or image-scroll function -- where the image-scroll is a li list of images, styled to look like a strip of images.
When the image-scroll works properly, one of the images in the li tag has a class of active, which expands the image and makes it look like it's in front of the other images,
... and as the user clicks through this strip of images, the active class changes/moves to the targeted li tag, expanding that image.
What's happening is that none of the li tags are active when the page loads - since the content is dynamic through the WP loop (I didn't want all of the li tags to start with the active class, so I didn't add it to the loop),
...and so the images are just lined up in a consistent strip w/o one of the images being expanded (or having that active class).
It is only if the user happens to click on one of the images that it expands,
...but i need one of the images to be expanded (to have the class of active) before the user clicks so I need the active class added as/after the page loads.
I have tried through the jQuery code to target one of the li tags to add the active class, using filter() or closest() after the page loads, but that didn't work.
Or maybe I should write a new script to add the active class?
Any help much appreciated!
I have the abbreviated html and the jQuery function below.
_Cindy
ps as the code indicates, I also have corresponding article titles that scroll with the images, so perhaps I need to adjust the jQuery there, too.
<div class="articles-scroll">
<ul class="images-scroll">
<li><!-- I need only one of these tags to have a class of active to start -->
<a href="#">
<span class="set-image-border" style="float: none;">
<img class="setborder" src="image-set-by-new-wp_query">
</span>
</a>
</li>
<li>
<a href="#">
<span class="set-image-border">
<img class="setborder" src="image-set-by-new-wp_query">
</span>
</a>
</li>
</ul>
<div class="clear-float"></div>
<!-- in this section of html one of the article titles is active to coordinate with the active li image above to produce a corresponding clickable title, this works, but once again, only when user clicks on an image to begin the jQuery image-scroll function -->
<div class="wrapper">
<ul class="images-content">
<li>
<div class="article-header">
<h2>
<a href="link-set-by-new-wp_query">
</h2>
</div>
</div>
</li>
<li>
<div class="wrapper">
<div class="article-header">
<h2>
<a href="link-set-by-new-wp_query">
</h2>
</div>
</div>
</li>
</ul>
</div>
jQuery(".images-scroll li a").click(function() {
jQuery(this).parent().parent().find("li").removeClass("active");
// tried the following instruction as well as on next line, but no go
// jQuery(this).parent().parent().closest("li").addClass("active");
jQuery(this).parent().addClass("active");
jQuery(this).parent().parent().parent().find(".images-content > li").removeClass("active");
jQuery(this).parent().parent().parent().find(".images-content > li").eq(jQuery(this).parent().index()).addClass("active");
var step = ((-250)*(jQuery(this).parent().index()-1))-60;
//alert(step);
jQuery(this).parent().parent().css("margin-left", step+"px");
return false;
});

The reason why the code you wrote didn't work is that you have it inside a click handler, so nothing happens until you click one of the targeted elements. If you want something to happen on page load you can use $(document).ready() (can be shortened as $()) or $(window).load(). Just add the following lines below or above your existing code.
jQuery(function(){
var $listItems = jQuery('.images-scroll li');
$listItems.first().addClass('active');
// Second list item
$listItems.eq(1).addClass('active');
// Third list item
$listItems.eq(2).addClass('active');
});
Also, please note that (unless it conflicts with a different plugin), writing $ is shorter than jQuery, and it should do the same.

Javascript / Html Show All / Hide All Thing

I'm trying to make a "Show All / Hide All", currently I've made it so when you click the text, it opens the image and text but I want a Show all so it will expand all divs.
Here is how it works at this moment: JSFiddle .
<div class="gwshowhide"><li><a class="printer">Amber Money Printer</a>
<div class="gwinfo">Level Requirement: 1<br>
<img src="pic.png"></div>
</div></li>
<div class="gwshowhide"><li><a class="printer">Moonstone Money Printer</a>
<div class="gwinfo">Level Requirement: 5<br>
<img src="pic1.png"></div>
</div></li>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.1/jquery.min.js"></script>
$(function () {
<script>
$('.printer').click(function () {
$(this).siblings('.gwinfo').slideToggle('slow')
})
})
</script>
In general: I want to add a Show all / Hide all text that would open all / hide all of these at once, I also want to keep the current system so when you click one, it opens / closes it. Thank you!

Here is a fiddle to get you started. I've outlined the general gist of what you need below.
Essentially, you need two components.
First, HTML. Which is just another anchor to click to toggle show/hide all.
<a class="toggle-all">Show All</a>
Second, you need an event on that new anchor to trigger the function you have, but for ALL the options.
$('.toggle-all').click(function() {
$('.printer').each(function () {
$(this).siblings('.gwinfo').slideToggle('slow');
});
});
From there, you might want to add something to toggle the text like:
if (open) {
$('.toggle-all').text('Hide all');
} else { ... }
Bonus tip: ALWAYS put semicolons at the end of your lines in JavaScript. Even though JS will auto-insert them, it can cause difficult to debug problems as well as make IE die in some cases.

<p class="showall">Show Hide All</p>
<div class="gwshowhide">
<li>
<a class="printer">Amber Money Printer</a>
<div class="gwinfo">Level Requirement: 1<br/>
<img src="pic.png"/>
</div>
</li>
</div>
<div class="gwshowhide">
<li>
<a class="printer">Moonstone Money Printer</a>
<div class="gwinfo">Level Requirement: 5<br/>
<img src="pic1.png"/>
</div>
</li>
</div>
and your jquery code would be
$(function () {
$('.printer').click(function () {
$(this).siblings('.gwinfo').slideToggle('slow');
})
});
$('.showall').on('click',function(){
$('.gwinfo,.gwinfo').slideToggle('slow');
});
Demo

To show/hide all use:
$('.gwinfo').toggle('slow');
Also, i believe the "gwinfo" divs are not correctly closed on the JSFiddle.

How to show the description of the elements that are listed on the sidebar on the body using show & hide javascript or JQuery?

I have 11 elements with long description of each element of them. I decided to display the elements on the sidebar and the description of each one of them will be displayed on the body directly when the user clicks on the element.
I came with a solution similar to this ONE
but the problem with this one is put the content (or description) inside the javascript code, and I want the description be on the HTML code to make it later on flexible for changes by the admin after putting the data including the description of these elements on the database instead of hard-coded style.
Therefore, how can I do that?

You can try this way
<div id="menu">
<ul>
<li id="a">item a
<div id="contentA" style="display:none">Description of item A</div>
</li>
<li id="b">item b
<div id="contentB" style="display:none">Description of item A</div>
</li>
</ul>
</div>
<div id="content"></div>
<script type="text/javascrip">
$(document).ready( function () {
$('#a').click(function() {
$('#content').html($('#contentA').html());
});
$('#b').click(function() {
$('#content').html($('#contentB').html());
});
});
<script>

I updated your example, it now uses hidden divs inside the clickable menu items, and on li click it finds the menu description and displays it.
This method does not depend on ids and degrades more gracefully (except if the client doesn't support JS but supports CSS display).

Your description is a bit unprecise, but if I get it right your could use IDs for the description text and fade them in/out with jQuery.
http://jsfiddle.net/PajFP/14/ (updated)