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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);
});

Auto focus on a tab

I am trying to set auto focus on a tab when page loads, but I can't make it work. I have created a fiddle, and as you can see in the code, I am trying to set focus on the tab with class="test
Can anyone see what I do wrong?
http://jsfiddle.net/qL2W4/2391/
<div id="mydiv">
<ul>
<li>rr</li>
<li class="test">gg</li>
<li>mm</li>
</ul>
</div>
$("#mydiv").tabs();
$("#mydiv").find(".test").focus();

You can use the selected option for this:
$("#mydiv").tabs({ selected: 1 });
Updated Fiddle
If you want it to work based on the li with a specific class you can do it by getting the index of the li with the selected class and passing it into the tabs options:
var selected = $(".test").index();
$("#mydiv").tabs({ selected: selected });
Fiddle

Try next :
$("#mydiv").tabs();
$("#mydiv").find(".test a").trigger("click");
Or, if you need only switch tab - use active property:
$("#mydiv").tabs();
$("#mydiv").tabs({
active:1
});
p.s. in my opinion second method is better, if you not need to emit click event for something other.

You can simply simulate a click:
<div id="mydiv">
<ul>
<li>rr</li>
<li>gg</li> <!-- NOTE CHANGE -->
<li>mm</li>
</ul>
</div>
$( document ).ready(function() {
$("#mydiv").tabs();
$('.test').click();
});

Click on Link to show data on div and Link Disappear is not working

What I need
I need when user click on link data is shown.
link disappear after click.
I have tried code
<a href="javascript:void(0);" class="viewdetail more"
style="color:#8989D3!important;">view details
<div class="speakers dis-non">
</div>
</a>
jquery code
$('.viewdetail').click(function() {
$(this).find('.speakers').show();
$(this).find('.viewdetail').hide();
});
problem
when I click on view detail link data is shown on div.
link doesn't disappear.
if I put anchor before div then data is not shown on speaker class div.
any suggestion are most welcome.
jsfiddle: http://jsfiddle.net/fw3sgc21/

Since the div is inside the anchor, the div will also be hidden if you hide the anchor. You need to put the div next to the anchor to make it work. Use next() method to select the div.
HTML
view detail
<div class="speakers dis-non" style="display: none">
test data to be shown
</div>
JS
$('#viewdetail').on('click', function(){
// show div with speakers class next to the anchor
$(this).next('div.speakers').show();
// hide the anchor
$(this).hide();
});
JSFiddle: http://jsfiddle.net/fw3sgc21/2/
EDIT
If you want to wrap the speakers div inside another div as below
view detail
<div class="12u">
<div class="speakers dis-non">
test data to be shown
</div>
</div>
with the following CSS
.dis-non
{
display: none;
}
Here's the JS that should show the speakers div and hide the clicked anchor
$('#viewdetail').on('click', function(){
$(this).next().children('div.speakers').show();
$(this).hide();
});
JSFiddle: http://jsfiddle.net/fw3sgc21/6/
EDIT 2
If you want to put the anchor inside two divs as below
<div class="a">
<div class="b">
view detail
</div>
</div>
<div class="12u">
<div class="speakers dis-non">
test data to be shown
</div>
</div>
Use .parent() method twice to select <div class="a">, then use .next().children('div.speakers').show() to show the speakers div
$('#viewdetail').on('click', function(){
$(this).parent().parent().next().children('div.speakers').show();
$(this).hide();
});
JSFiddle: http://jsfiddle.net/fw3sgc21/8/

Try the following:
$('.viewdetail').click(function()
{
$('.speakers').show();
$(this).hide();
});
$(this) refers to the .viewdetail so you don't need the find it again
Pull the div outside the hyperlink
HTML:
view details
<div class="speakers dis-non"></div>

try this
html
<a href="javascript:void(0);" id="viewdetail" style="color:green">view detail
</a>
<div class="speakers dis-non">
test
</div>
js
$('#viewdetail').click(function() {
$('.speakers').show();
$(this).hide();
});
http://jsfiddle.net/fw3sgc21/1/

First of all this in your code refers to to the clicked link itself.
So this line $(this).find('.viewdetail').hide(); doesn't work, because there is no .viewdetail inside of link. It should be
$('.viewdetail').on('click',function(e) {
var self = $(this);
self.find('.speakers').show();
self.hide();
});
But, if you hide your link, the .speakers will be also hidden, because it's inside of your link. If you want it to be visible, you should place it outside of link
For example:
view details
<div class="speakers dis-non"></div>
And JS:
$('.viewdetail').on('click',function(e) {
var self = $(this);
e.preventDefault(); // prevent link from working the way it should
self.next('.speakers').show();
self.hide();
});

slideDown function needs two click to work

I'm having a slideDown function on my site. But somehow it doesn't work the first time when you click it. So I need to click two times to make the function work. What can possible be wrong?
I also want the div to slide up when I click on the button again, don't know how I will do this. I tried using slideToggle but it just ended up with the div going up and down a couple of times before closing. Even for this I needed to click two times.
Here is my JS:
function showCart() {
$("#rollDown").click(function() {
$("#shopping_cart_page").slideDown();
});
/* not relevant for this */
emptyBag = document.getElementById("emptyBag");
emptyBag.addEventListener("click", emptyCart);
}
And here is my HTML:
<div id="navbar">
<ul>
<li>Products</li>
<li>About</li>
<li>Giveaways</li>
<li>Contact </li>
<li><a id="rollDown">Shopping Bag</a></li>
</ul>
</div>

Here's a simple example:
jQuery:
$(document).ready(function(){ // Just adding the click event inside the document ready method should do the trick for you.
$("#rollDown").click(function() {
$("#shopping_cart_page").slideToggle();
});
});
HTML
<input type="submit" id="rollDown" value="Toggle"/>
<div id="shopping_cart_page">Hi</div>
Fiddle: http://jsfiddle.net/64gn1unk/

how to add class on click event on another list

Problem is following. So, I have this HTML
<div class="sitemap">
<div class="collapse-all">
[alles Ausklappen / Einklappen]
</div>
<div class="collapse-list"> <!-- 1. box -->
<div class="collapse-box">
<h2>
Logo
</h2>
<!-- This "in" class for some reason helps us to keep all boxes closed -->
<div class="collpase-container collapse in" id="first-select-box">
<ul>
<li >
And I need to add class, lets say "active" to an element collapse-box when user clicks on div "collapse-all". I hope I made it clear.
Here is small screenshot from DOM.
LINK TO screenshot:
http://i62.tinypic.com/r8e8zs.jpg
pls try to edit this fiddle:
http://jsfiddle.net/ufe8n/1/

You can do this:
$(".collapse-all a").click(function(e){
e.preventDefault();
$(this).closest(".collapse-all").next().find('.collapse-box').addClass('active');
});
Is this you want.

You can use this code in click handler of .collapse-all div:
$(".collapse-all").click(function(){
$(this).next().find('.collapse-box').addClass('active');
});

$(".collapse-all").click(function(){
$(".collapse-box").addClass("active");
});

$(".collapse-all").live("click",function(){
$(".collapse-box").addClass("active");
});