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jQuery changing body's background color

This is frustrating and I can't figure this out.
I just need to change/toggle back/foreground color
for the entire body when user clicks on a link, 'theme'.
Following is my html file.
...
<style>
highlight {
background-color: black;
color: white;
}
</style>
<script>
$(document).ready(function () {
$('.theme').on('click', function () {
$(document.body).toggleClass("highlight");
//$(document.body).css({"background-color": "black"});
});
});
</script>
When I use $().css({...}), it works but when I try to use
class to be able to toggle, it doesn't. Please help.

Agree with Rayon. "highlight" in the style is not a class if missing the period in front. jQuery is not able to toggle the "highlight" class since there's no "highlight" class to toggle. The code works here: http://liveweave.com/T6c7Mz

change the following line
$(document.body).toggleClass("highlight");
with
$("body").toggleClass("highlight");

This will work
HTML
Click Me
CSS
body { background-color:red; }
.highlight
{
background-color:yellow;
}
JQUERY
$("#theme").click(function() {
$("body").toggleClass("highlight");
});
Here is the working code
http://jsfiddle.net/CLwE5/119/

Select <divs> within parent <div> using jQuery

I have a parent <div>, #amwcontentwrapper, which has a series of divs within it with their own classes and ids.
I want to use jQuery to select these child divs, and IF they have the class .amwhidden, do nothing, but if not, remove the .amwshown class and add the .amwhidden class.
This is what I have so far, but it is not working. I think it may be my selecting of the child divs within the parent.
Can anybody see any obvious problems? Thanks for your help.
if ($('#amwcontentwrapper > div').hasClass('amwhidden')){
} else {
$('#amwcontentwrapper > div').fadeIn(600, function(){
$('#amwcontentwrapper > div').removeClass('amwshown');
$('#amwcontentwrapper > div').addClass('amwhidden');
});
}
And here is the basic html that I am using:
<div class="amwshown" id="amwintro">
Intro Section, which should have the 'amwshown' class removed, and the
'amwhidden' class added, when the jQuery runs. Currently, this does not happen.
</div>
UPDATE: Using War10ck's solution in the comments below (i.e. $('#amwcontentwrapper > div.amwshown')) I have managed to get the classes changing as I wished. However, those which have had the .amwshown class removed and .amwhidden class added still show on the page, despite the CSS looking like this:
.amwhidden {
display:none;
}
.amwshown {
display:block;
}
Looking at the Dev Tools, it seems that, when the jQuery is run (on a click event) the classes are changing, but any classes which are having the .amwshown class added (thus displaying them on the page) are also having the a <style> tag added to them which makes them display:block;
When I then press another button, which should hide the aformentioned <div> to make way for another one, the class is being changed to .amwhidden, but that <style> tag is not being deleted, so even though it has the .amwhidden class, it is still on the page.
I've created a JSFiddle here, if anybody still wants to help!
`
$(document).ready(function() {
$('#buybutton').click(function() {
$('#amwcontentwrapper > div.amwshown').fadeIn(600, function() {
$(this).removeClass('amwshown').addClass('amwhidden');
});
if ($('#amwbuy').hasClass('amwshown')) {} else {
$('#amwbuy').fadeIn(600, function() {
$('#amwbuy').removeClass('amwhidden');
$('#amwbuy').addClass('amwshown');
});
}
});
$('#phdbutton').click(function() {
$('#amwcontentwrapper > div.amwshown').fadeIn(600, function() {
$(this).removeClass('amwshown').addClass('amwhidden');
});
if ($('#amwphd').hasClass('amwshown')) {} else {
$('#amwphd').fadeIn(600, function() {
$('#amwphd').removeClass('amwhidden');
$('#amwphd').addClass('amwshown');
});
}
});
});
#sidebar {
position: absolute;
left: 1%;
top: 1%;
font-size: 5em;
color: #000000;
width: 10%;
display: block;
background-color: red;
}
#amwcontentwrapper {
position: absolute;
left: 20%;
top: 5%;
}
.amwshown {
display: block;
}
.amwhidden {
display: none;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="amwsidebar">
<span class="sidebarbutton" id="phdbutton">PhD Button</span>
<br />
<br />
<span class="sidebarbutton" id="buybutton">Buy Button</span>
</div>
<div id="amwcontentwrapper">
<div class="amwshown" id="amwintro">
<p>An intro section to welcome the visitor. Disappears when one of the other sections is clicked.</p>
<br />
<br />
</div>
<div class="amwhidden" id="amwbuy">
Buy Section
</div>
<div class="amwhidden" id="amwphd">
PhD Section
</div>
</div>
`

You can use not to remove the elements you do not want, like this:
$('#amwcontentwrapper > div').not('.amwhidden')
.removeClass('amwshown')
.addClass('amwhidden');
And work with that.

Try this
$(document).ready(function() {
$("#amwcontentwrapper").children().each(function(elem, x) {
if ($(x).attr("class") == "amwhidden") {
alert($(x).attr("class"));
$(x).removeClass("amwhidden").addClass("amwshow");
alert($(x).attr("class"));
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>
<div id="amwcontentwrapper">
<div class="amwhidden"></div>
<div></div>
<div></div>
</div>

You can try each as follow,
$("#amwcontentwrapper div").each(function(){
if($(this).hasClass('amwhidden'))
//DO something
else
//DO something
});

Thank you for all help, it has prompted some brainstorming which has solved this issue.
Instead of adding the .amwhidden class and removing the .amwhidden class using jQuery, I have just created a .amwsection class, which all the sections belong to which has an initial display value of none. So far, so good; all of the sections are not there when you load up the page.
Then I use the .css jQuery function to change the display:none to display:block when the corresponding button is clicked, and changing all other .amwsections to display:none. This works just fine, but the effect is quite abrupt; there is no fading in, as you would get if you used the .animate function. .animate, however, does not work with the display value.
.fadeOut and .fadeIn to the rescue! By wrapping the .css change in these, I can create a fading in/out effect and can still use the display value.
Here is one example of this code.
The #buybutton is the button to be pressed.
#amwintro is just something which appears when the page loads - it will now be set to display:none if this is the first button pressed.
The .amwsection are all of the hidden sections. This portion of the code just resets all of them. This and the #amwintro section happen very quickly (1/100th of a second) to keep response time good.
The #amwbuy is the specific section that I want to reveal. As you can see, this fades in over a longer period.
Currently only tested in Chrome, but I think I've got it!
$(document).ready(function () {
$('#buybutton').click(function() {
$('#amwintro').fadeOut(1, function() {
$(this).css({
display:'none',
});
});
$('.amwsection').fadeOut(1, function() {
$(this).css({
display:'none',
});
});
$('#amwbuy').fadeIn(600, function() {
$(this).css({
display:'block',
});
});
});
});

click to change background toggle

When I click on it changes background. It works fine. But what if I want to click on it again to restore the original background? I have this code:
jQuery(document).ready(function($) {
$(".select").on("click", function () {
$(this).css("background-image", "url(images/selected.png)");
});
});
Here is jsfiddle EXAMPLE
Basically when I click on the div it changes the background, which is fine. But I want to have ability to click on it again to restore the original background.
It will be an alternative solution for tick box, but just for demo purposes.
Thanks

JS
replace
$(this).css("background-image", "url(images/selected.png)");
with
$(this).toggleClass("active");
Style
#multiselect .active {
background-image: url('...');
}
Fiddle http://jsfiddle.net/09xgrhxo/4/

Instead of using .css() to change the background-image I would add a class in your CSS and use .toggleClass().
Also be aware that simply adding a class will not be specific enough because your css is using:
#multiselect .select
you're going to have to target the class you add as a child of #multiselect:
#multiselect .change
CSS
#multiselect .change{
background-image: url(http://t2.gstatic.com/images?q=tbn:ANd9GcSZ51HqKXkejWAFcSBrodHd5eUN2QaIJro0jhN1YpmljSdQ5dj2)
}
JS
$(".select").on("click", function () {
$(this).toggleClass("change");
});
FIDDLE

You could use data-* attribute.
$('.select').attr('data-img', $('.select').css('background-image'));
$(".select").on("click", function() {
$(this).css("background-image", ($(this).css('background-image') == $(this).data('img')) ? "url(http://t2.gstatic.com/images?q=tbn:ANd9GcSZ51HqKXkejWAFcSBrodHd5eUN2QaIJro0jhN1YpmljSdQ5dj2)" : $(this).data('img'));
});
#multiselect .select {
background: url(http://t0.gstatic.com/images?q=tbn:ANd9GcQF_ErOlc78eOGZaEWb-dwPkrv2uyAoKx0Pbn3-e0tAZoUDSQRCsA) center;
width: 250px;
height: 100px;
margin-bottom: 20px;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="multiselect">
<div class="select">Option1</div>
<div class="select">Option2</div>
<div class="select">Option3</div>
</div>

Instead of writing background-img url in javascrpt, I would suggest to create two classes having same properties but different background-img url which you want to toggle. so here we will be toggling class (ultimately background-img) in javascript.
see jsfiddle [example][1]
[1]: http://jsfiddle.net/09xgrhxo/13/

Chevron Icon pointing up or down depending on accordion position

I've got an accordion I've built using jQuery UI. I need the chevron icons that point up or down depending on if the section is open or closed. The problem is my jQuery. At least initially it is. I'm seeing both chevrons on load and once clicked the chevron doesn't change at all.
Jquery
$(function() {
$(".section a").click(function() {
$(".chevron").removeClass("chevron").addClass("up");
});
});
CSS
.chevron {
background: url("images/down.png") no-repeat;
}
.up {
background: url("images/up.png");
}
HTML
<div class="section">
<a href="#"><div class="tab active">
<span class="chevron"></span><h3>Section 1</h3>
</div></a> <!-- tab -->

You need to reference this so it toggles the element you are clicking on (not all of them at once). Once you have $(this), you can use .find to search for the chevron within the link.
Finally, you can use toggleClass to switch between the class states. This allows you to click the link repeatedly and have it switch between the class states.
$(function() {
//Add down to all .chevrons
$(".section a .chevron").addClass('down');
//Toggle up/down classes
$(".section a").click(function() {
var $chevron = $(this).find('.chevron');
$chevron.toggleClass("down up");
});
});
Then for CSS, set the classes to the correct chevron image:
.chevron.up { background-image('images/up.png'); }
.chevron.down { background-image('images/down.png'); }

How to change the color of another link on hover?

This is the simple HTML code:
<li class="main">
ImageLink <!--1st anchor tag-->
ImageName <!--2nd anchor tag-->
</li>
Is it possible to change the color of 2nd anchor tag on hover state of 1st anchor tag? (And vice versa.)

Not with css. This kind of actions can only be done by script.
If you use jQuery you could add the following script:
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.0/jquery.min.js"></script>
<script type="text/javascript>
$(document).ready(function(){
var a1 = $('a:first');
var a2 = $('a:second');
a1.hover(function(){ a2.toggleClass('hover') }, function(){ a2.toggleClass('hover') });
a2.hover(function(){ a1.toggleClass('hover') }, function(){ a1.toggleClass('hover') });
});
</script>
Now you can use the hover class to specify the color:
.hover { color: red; }
Edit
It would be easier to give both a's an id, so you could reference them by using var a1 = $('#a1');.

With CSS, it's possible to change the color of the 2nd anchor tag on hover of the 1st anchor tag with a sibling selector, but I don't think you can do it vice-versa:
a:hover + a {
color: red;
}
JSFiddle preview: http://jsfiddle.net/9Ezt5/
See http://www.w3.org/TR/CSS2/selector.html#adjacent-selectors
However, note that adjacent sibling selectors are not supported on all browsers: http://www.quirksmode.org/css/contents.html

Yes you can do it with pure css.
for example:
a:hover + a{
background:red;
}
Check this for more
http://jsfiddle.net/Bw5by/

In Jquery you can do it like this,
$("#first").hover(function(){
$('#second').css('color','red')
},function(){
$('#second').css('color','blue')
});
See it in action here,
http://jsfiddle.net/gagan/NYAHY/1/

If those are the only two links in the list item tag, then you could do something like this:
li.main:hover a
{
color: red;
}
li.main a:hover
{
color: blue;
}
Then your hovered link will be blue, and all the other ones (in this case just that other one) will be red.