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nth-child(odd) not working properly when change class [closed]

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I keep some elements inside one container. For better visibility odd elements have other background color. Sometimes I need to filter elements with conditions, so unwanted elements I move to another class, but it seems nth-child keep old state. Even if I make it dynamic with jQuery still it keeping old state.
I would prefer keep used and unused elements in same container - if I separate them and change filters, need to sort visible elements again.
jsfiddle: http://jsfiddle.net/ex4740n2/5/
Have you any ideas how to solve it?
Thanks in advance!

The answer by #Pete:
But I'm guessing your problem is that you think nth-child is a class selector - it's not, it's an element selector
So, if it not possible to make it by only css, make it using JS. Iterate visible elements and change background color.
var visibled = $(".item");
for (var i = 0; i < visibled.length; i += 2) {
$(visibled[i]).css("background-color", "rgba(190, 255, 196, 1)");
$(visibled[i + 1]).css("background-color", "");
}

HTML map that I can add images over [closed]

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I need some help with a design for a web application I want to create. Basically I want to start with a black background..let's say 1000px X 1000px. Then on an event..lets say a click event, I want to be able to add a small image of a star on top of that background at the coordinates of my choice. And keep doing that until I have a bunch of stars on the black background.
I don't know how to set up my html to be able to do this. Once I have the overall design I can take it from there, I just don't know where to start.
Languages: HTML, Javascript, CSS
Starting Image:
Image to Add:
Ending Image:

http://jsfiddle.net/mpprq3r3/
Heres a very simple example. Look at how its done and change it to fit your needs.
$(".canvas").on("click", function(e) {
var parentOffset = $(this).parent().offset();
var relX = e.originalEvent.pageX - parentOffset.left;
var relY = e.originalEvent.pageY - parentOffset.top;
console.log(relX)
$(this).append("<div class='item' style='top:"+(relY-5)+"px;left:"+(relX-5)+"px'><img src='http://i.stack.imgur.com/4Crjc.png' /></div>");
});

Two <div>'s stick together scroll [closed]

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I'm working on my diploma thesis, an interactive programming language which should run in browser eniroment using javascript.
In the moment I use an input line and enter event to start interaction and give feedback.
I would like to change this to have a textinput and a second field next to it where the result is shown. I use
<div id = "code" conetenteditable="true"> </div>
<div id= "result"><div>
Both are placed in a table row, so they are next to each other
how can I get result to scroll according to the actual scroll of code?
By the way I use jquery as library.
Thanks,
Rainer

In order for an element to be fixed on a page and remain there as you scroll, you must use CSS.
The code should look like:
<div id = "code" conetenteditable="true" style="position:fixed;"> </div>
<div id= "result" style="position:fixed"><div>
You can position them however you want with top, bottom, left, right.

Use css fixed position for your both dives.
like that:
#id,#result{
position: fixed;
}

I believe your problem is not with the element position but with the scroll of the text inside of the #result div.
If that's the case, you might want to use the overflow css property to have the div show an inner scrollbar.
#result {
overflow-y:auto;
max-height:100px;
}
in this example, the div will scroll if the text inside it stretches above 100px.

How to make a simple mini map in a html [closed]

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Basically I want to try making a simple mini map with HTML,but I cant figure it out.
Can someone give me a sample?
Just 2 image that are the same but with different sizes. One is small and the other is big, And if you click on any coordinates of the small image,the large image the show where you clicked.
I'm still new at HTML and want to learn more, just need a sample so I can analyze on how to make it.

like i said create a image , find the mouse coordinates over that image.
create a div with the same image and set the background position.
replace YOURMAP with a image.
var img,w,h,mu=true,map,MAP='YOURMAP';
function pos(e){
var x=e.pageX-img.offsetLeft,y=e.pageY-img.offsetTop,
left=((w/img.width*x)-(map.offsetWidth/2))*-1,
top=((h/img.height*y)-(map.offsetHeight/2))*-1;
map.style['background-position']=left+'px '+top+'px';
}
window.onload=function(){
img=document.createElement('img');
img.onload=function(){
w=this.width;h=this.height;
img.style.width='200px';
}
img.src=MAP;
map=document.createElement('div');
map.style.background='#000 url('+MAP+') no-repeat 0 0';
map.style.width='200px';
map.style.height='200px';
document.body.appendChild(img);
document.body.appendChild(map);
img.addEventListener('mousedown',function(e){
mu=false;pos(e);e.preventDefault()
},false);
img.addEventListener('mousemove',function(e){
mu||pos(e)
},false);
img.addEventListener('mouseup',function(e){
mu=true
},false);
}
Demo http://jsfiddle.net/m3snq/3/ or http://jsfiddle.net/m3snq/6/
if you don't understand something just ask..

Changing Beginning of img [closed]

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How to change the "start" of image?
I mean that the img is in the immobility only it's beginning is moving
I want change it CSS or HTML, in the last resort in JavaScript
Something like this: FIRST PICTURE (This picture on click change it's beginnig).
... It transform to it: SECOND PICTURE
Any idea? :/

<div class="myImg"> </div>
<style>
.myImg{
background: url('myimg.jpg');
}
.myImg2{
background: url('myotherimg.jpg');
}
</style>
<script type="javascript/text">
$('.myImg').click(function() {
$(this).removeClass('myImg');
$(this).addClass('myImg2');
});
</script>
Ofcourse you'll have to use jquery link to get jQuery latest update.
So what have i actually done here?
I've used jQuery to check if user click div .myImg if he did i just switch bettwen the div's classes and each other class got different image.
Hope i helped.

I'm not entirely sure what you're asking, but it sounds like you might want to do CSS sprites.
http://css-tricks.com/css-sprites/
If you want to change the image on click, you'll need some code. I won't spend too much time on that, given your question is hard to decipher, but if it were me, I would create a class per sprite, then toggle between the two classes based on the click event.