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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',
});
});
});
});

Targeting previous div in javascript or css

HTML code:
<div class="content">
<textarea> hello.png </textarea>
</div>
<div class="content-btn">
Click me
</div>
Javascript code:
$(".button").click(function() {
if ($(this).parent().previousSibling('.content').css('display') == 'none'){
$('.content').hide();
$(this).parent().previousSibling('.content').show();
}else {
$('.content').hide();
}
});
How would I go about only showing the textarea when 'Cick me' is clicked or hovered preferably in css but if not javascript. Thanks guys
https://jsfiddle.net/uway5hhg/8/

As exercise you could do this effect in pure css (using :target pseudoclass and a long delay in a simple transition) if you add a close button just below the textarea
http://codepen.io/anon/pen/JYoMRK
<div class="content" id="text">
<textarea> hello.png </textarea><br />
Close
</div>
<div class="content-btn">
Open
</div>
CSS
#text {
overflow: hidden;
height: 0;
opacity: 0;
transition: opacity 0s 999999s;
}
#text:target {
opacity: 1;
height: auto;
transition-delay: 0s;
}
#text:target ~ div a.button { display: none; }
Anyway if you look for a straight jQuery approach, a simple toggle() is enough (you might have to hide the .content element via css depending on the initial condition of your textarea)
https://jsfiddle.net/uway5hhg/39/
$(".button").click(function() {
var content = $(this).parent().prev('.content');
content.toggle();
});

As far as I know there is no way to catch previous sibling in CSS.
But it works with jQuery, here is your slightly changed code:
$(".button").on('click', function() {
var ele = $(this),
par = ele.parent(),
sbl = par.prev();
if (sbl.css('display') == 'none'){
$('.content').hide();
sbl.show();
}else {
$('.content').hide();
}
});
Working example is here: https://jsfiddle.net/y0ab3n0L/

That should do it's job
JS:
$(".button").click(function() {
var contentBtn = $(this).parent(".content-btn");
var content = $(contentBtn).prev(".content");
var textarea = $(content).find("textarea");
$(textarea).toggle();
});
or event shorter:
$(".button").click(function() {
$(this).parent(".content-btn").prev(".content").find("textarea").toggle();
});
https://jsfiddle.net/uway5hhg/21/
Hope this helps :)

Solution provided by Fabrizio is a good one if you want no javascript.
However you can also modify the DOM to have a similar effect.
<div class="content-wrapper">
<div class="content" id="text">
<textarea>hello.png</textarea>
</div>
Click me
</div>
CSS
.content {
display:none;
}
.content-wrapper:hover .content {
display:block;
}
.content-wrapper:hover .button {
display:none;
}
https://jsfiddle.net/2Lsszgqz/

There is no such CSS pseudo element - a.button:click, so only JS solution will work (without changing your HTML structure). You can also get to close of it using :focus CSS pseudo class. But you will lack to go up one level in CSS and then show the textarea. So, only solution left is using JS.
In your sample JS code you have used .previousSibling('.content') which is native JS, which you are calling on jQuery object, that's why it will not work. jQuery equivalent of this function is .prev('.content')
Correct Syntax would be -
$(".button").click(function() {
if ($(this).parent().prev('.content').css('display') == 'none'){
$('.content').hide();
$(this).parent().prev('.content').show();
}else {
$('.content').hide();
}
});
Working Fiddle

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/

Javascript change colour of divs, and then colour of the div's focus

I am making a html forum and am using javascript to change the colour of the forum, I have three divs, one is blue, green and red.
When each div is clicked, the javascript will change the colour of the elements.
I would like to change the colour of the submit button's focus with the .css() function in javascript, but the focus part doesn't work.
Here is my javascript code:
$("#green").click(function() {
$(".mailheader").css("background","#a3d300");
$(".submit").css("background","#a3d300");
$(".submit:focus").css("background","#98cf00");
});
$("#blue").click(function() {
$(".mailheader").css("background","#00b4ff");
$(".submit").css("background","#00b4ff");
$(".submit:focus").css("background","#04a6e9");
});
$("#red").click(function() {
$(".mailheader").css("background","#ff0000");
$(".submit").css("background","#ff0000");
$(".submit:focus").css("background","#ea0202");
});
So I have tried $(".submit:focus").css("background","#ea0202"); for chaning the background of the focus, but it doesn't work. anyone know how to fix this? thanks

Check this
DEMO
HTML
<div class="mailheader"></div>
<div id="green"></div>
<div id="blue"></div>
<div id="red"></div>
<input type="button" value="submit" class="submit" />
CSS
#green, #red, #blue {
height:50px;
width:100px;
}
#green {
background-color:green;
}
#red {
background-color:red;
}
#blue {
background-color:blue;
}
jQuery
$("#green").click(function () {
$(".mailheader").css("background", "#a3d300");
$(".submit").css("background", "#a3d300");
$(".submit").focus(function () {
$(".submit").css("background", "#04a6e9");
})
});
$("#blue").click(function () {
$(".mailheader").css("background", "#00b4ff");
$(".submit").css("background", "#00b4ff");
$(".submit").focus(function () {
$(".submit").css("background", "#ea0202");
})
});
$("#red").click(function () {
$(".mailheader").css("background", "#ff0000");
$(".submit").css("background", "#ff0000");
$(".submit").focus(function () {
$(".submit").css("background", "#98cf00");
})
});

You are setting styles directly on the element. Why not set a css class on the elements and handle all the changes via css. That is much cleaner and easier to use.
eg. when '#green' is clicked add a class 'Green' to the submit button. (see http://api.jquery.com/addClass/ ) (be sure to remove the other classes)
Then in css you can set #MySubmitButton.Green{.. your green styles..} and use all the pseudo css classes you like. Things like #MySubmitButton.Green:hover {color:#FF00FF;}
Hope this helps...

jQuery can't change pseudo-elements' style
Fix (I used the .html() function for the :focus's style, using a <style> tag in the body or elsewhere):
<script>
...
$(".submit").css("background","#ff0000");
$("body style.changeColor").html("
.submit:focus {background: #ea0202};
");
...
</script>
<body>
<style class="changeColor">
</style>
</body>
And I were you, I rather change all other .css() functions into text inside the .html() string.
$("body style.changeColor").html("
...
.submit {background: #ff0000};
.submit:focus {background: #ea0202};
");