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Trigger completely separate div based on hover of other div

Is it possible to trigger changes to CSS of an element that is completely unrelated to the hovered div?
I have a CSS hover effect on a dropdown menu, that I also want to trigger the opacity of a div right at the bottom of the page to create a background overlay effect.
This is the CSS I'm using:
#overlay {
background:rgba(0,0,0,0.5);
position:absolute;
top:120px;
left:0;
z-index:0;
height:120%;
width:100%;
visibility:hidden;
opacity:0;
}
#menu-main-menu li.menu-parent-item:hover ul.sub-menu,
#menu-main-menu li.menu-parent-item:hover #overlay {
visibility:visible;
opacity:1;
}
The hover of the sub menu works fine, but the div #overlay is right at the bottom of the page, and doesn't get called when it's hovered.
I've tried all kinds of alternatives such as :hover > #overlay, :hover + #overlay, but nothing seems to trigger it. I also can't seem to find a definitive answer to the question.
Is it possible?

Yes. You can load this style in a php file and then use jQuery to apply the css when your div has been hovered on.

No there is no way to select parent element in css and that means that you cannot move up in hierarchy.
<ul class="hover-parent">
<li></li>
</ul>
<div>Something here</div>
<div class="target"></div>
From this point :
.hover-parent li:hover you cannot go up (to ul or div).
Selectors which you tried to use are "next":
A>B - This will select only direct B children of A
A+B This will select B immediately preceded by A
Here you can find W3C documentation of CSS selector
http://www.w3.org/TR/CSS2/selector.html#adjacent-selectors
And demos:
http://code.tutsplus.com/tutorials/the-30-css-selectors-you-must-memorize--net-16048
Notice that it will be really confusing for user that different part off app/page is changing when he is hovering something else. Bad UX idea.

You're going to have to use JavaScript to do this.
Your posted selector #menu-main-menu li.menu-parent-item:hover #overlay is looking for #overlay somewhere inside of an ancestor element of li.menu-parent-item that is somewhere inside of an ancestor element with an id of #menu-main-menu.
Using the child selector > will not work as the overlay element is not a child of the list element you're hovering in your menu from what you have described and from comment responses.
As #Paulie_D has pointed out the two target elements, the element to be hovered and the overlay element, need to adjacent siblings to use the sibling selector +. From what you have described and the comment responses they are not adjacent siblings.
I have setup a basic example for you using jQuery. This example displays the overlay as long as you are hovering any element in the .main-menu element.
HTML
<ul class="main-menu">
<li>Item One</li>
<li>Item Two</li>
<li>Item Three
<ul class="sub-menu">
<li>Sub Item One</li>
<li>Sub Item Two</li>
<li>Sub Item Three</li>
<li>Sub Item Four</li>
<li>Sub Item Five</li>
</ul>
</li>
</ul>
<main>
Content here.
</main>
<footer>
<div class="overlay">This is my overlay.</div>
</footer>
CSS
body {
margin: 25px auto;
width: 500px;
}
ul,
li {
margin: 0;
padding: 0;
}
main {
min-height: 300px;
}
footer,
.overlay {
height: 50px;
}
footer {
position: realative;
background-color: yellow;
}
.main-menu {
list-style: none;
height: 50px;
}
.main-menu > li {
float: left;
padding: 0 10px;
position: relative;
}
.main-menu > li:hover .sub-menu {
display: block;
}
.sub-menu {
display: none;
list-style: none;
position: absolute;
left: 10px;
width: 150px;
}
.overlay {
display: none;
text-align: center;
}
jQuery
$overlay = $('.overlay');
$('.main-menu > li').hover(
// when hovered
function() {
$overlay.css('display','block');
},
// when NOT hovered
function() {
$overlay.css('display','none');
}
);
jsFiddle: http://jsfiddle.net/ednf2pzq/
Edit
You could simplify the jQuery hover selector to .main-menu.
jQuery
$('.main-menu > li').hover(
// same code as before
);
jsFiddle: http://jsfiddle.net/ednf2pzq/1/

Display only one list item at the center of the <div> with overflow:hidden

I'm trying out a vertical ticker that displays a few text list items one after the other, but I need some help in positioning them.
You'll see a web ticker with two items. To display only one item at a time, I have to set 'overflow:hidden' in #tickerContainer.
However, the text in the ticker is not being positioned at the center of the ticker(As you see it is sitting at the bottom).
Also, when I remove 'overflow:hidden' from #tickerContainer, which is the whole ticker moving away from the top of the page?
Please help me fix this.
http://jsfiddle.net/nodovitt/NYhY4/2/
<div id="tickerContainer">
<ul id="ticker" class="js-hidden">
<li class="news-item">Item Number 1</li>
<li class="news-item">Item Number 2</li>
</ul>
</div>
The jQuery function:
<script>
function tick() {
$('#ticker li:first').slideUp(1000, function () {
$(this).appendTo($('#ticker')).slideDown(1000);
});
}
setInterval(function () {
tick()
}, 2000);
</script>
The CSS:
#tickerContainer {
background-color:white;
border-radius:15px;
text-align:center;
margin:10px;
box-shadow:0 0 8px black;
color:#2B7CD8;
font-size:50px;
width:500px;
height:100px;
overflow:hidden;
}
.news-item {
font-family:Times New Roman;
font-style:oblique;
}
#ticker li {
list-style-type:none;
}

You haven't put any specifications on your ticker id. So something like this http://jsfiddle.net/NYhY4/10/
#ticker {
padding:0px;
margin:0px;
padding-top:20px;
height:55px;
overflow:hidden;
}

Here is my answer as requested by OP
Add this css to your #ticker
#ticker {
margin: 0;
padding: 0;
line-height: 100px;
}
NOTE The line-height will always have to be the height of the #tickerContainer
You can see it here http://jsfiddle.net/NYhY4/3/

#ticker li {
list-style-type:none;
position: relative;
bottom:20px;
}

I didn't like the current item being hidden by seemingly "nothing" (the blank part of li box above the text) so I used this approach:
Remove the margins from the '#ticker'
set '#ticker' padding-top (.5em worked best for me)
set '#ticker li' padding-bottom to push the next item out of view (I used '1em' to be safe but '.5em' worked too)
The words didn't look perfectly centered so
set '#ticker li' line-height to '1em'
#ticker {
margin: 0;
padding-top: .5em;
}
#ticker li{
line-height: 1em;
padding-bottom: 1em;
list-style-type: none;
}
http://jsfiddle.net/JvuKU/2/
Note This depends on the font-size of the '#tickerContainer'. If you change the height or font-size of the '#tickerContainer', just adjust the values of '#ticker' padding-top and '#ticker li' padding-bottom.

Disable Horizontal Scrolling on Mobile Webpage

I've got this simple mobile webpage I'm trying to build, with a Facebook like side menu button. I'm trying to disable horizontal scrolling with the CSS overflow-x:hidden, but it's not working. Here's my code, any help will be greatly appreciated:
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
$("button").click(function(){
var win = $("#right-side");
var position = win.position();
//alert( "left: " + position.left + ", top: " + position.top );
if(position.left < 100)
{
$("#right-side").animate({left:'250px'});
}else{
$("#right-side").animate({left:'0px'});
}
});
});
</script>
<style>
body{overflow-x: hidden;font-family: sans-serif;}
#right-side{
background:#BFC7D8;;
left:0;
top:0;
height:100%;
width:100%;
position:absolute;
}
#left-menu
{
background:#323949;
left:0;
top:0;
height:100%;
width:250px;
position:absolute;
}
#navigation { font-size:20px; width:250px; padding-top:100px; }
#navigation ul { margin:0px; padding:0px; }
#navigation li { list-style: none; }
ul.top-level li > a {
display: block;
border-bottom: 1px solid rgba(0,0,0, 0.1);
border-top: 1px solid rgba(255, 255, 255, 0.1);
padding: 15px;
text-shadow: 0 1px 0 #000;
text-decoration: none;
color: #ccc;
text-indent: 20px;
}
#toolbar
{
width:100%;
height:50px;
background:#00F;
}
</style>
<div id="left-menu">
<div id="navigation">
<ul class="top-level">
<li>Home</li>
<li>About</li>
<li>Contact</li>
<li>FAQ</li>
<li>News</li>
</ul>
</div>
</div>
<div id="right-side">
<div id="toolbar">
<button>Menu</button>
</div>
<h1>This is a test</h1>
</div>

I have put your code in a fiddle but I couldn't add the 'zoom' meta tag to the head, so it is hard to test on my phone. http://jsfiddle.net/Pevara/Ku5nY/1/show/
Seems to work fine on desktop though, no scrollbars.
I did add the following to your css:
body{
overflow-x:hidden;
font-family: sans-serif;
/* added: */
max-width: 100%;
height: 100%;
}
Not sure if it will make a difference, but it is worth a try...

David.
Have you tried using this: http://mmenu.frebsite.nl/
Alternatively, Take a look at this and see if you can use it to adjust to your code:
http://jsfiddle.net/tzDjA/
You will notice there are 3 functions:
$('#trigger').click( function() {
if ($('#popout').hasClass('hidden')) {
$('#popout').removeClass('hidden');
showPopout();
}
else {
$('#popout').addClass('hidden');
hidePopout();
}
});
function showPopout() {
$('#popout').animate({
left: 0
}, 'slow', function () {
$('#trigger span').html('Close'); //change the trigger text at end of animation
});
}
function hidePopout() {
$('#popout').animate({
left: -40
}, 'slow', function () {
$('#trigger span').html('Show'); //change the trigger text at end of animation
});
}

I had a similar issue where I had the menu behind my content and was pushing my content to the left to reveal the facebook style menu hidden behind.
I was applying 'absolute' positioning to mimic the slide across and taking the content out of the document flow. With overflow hidden it seemed you could pull the content layer over with touch (which sounds like the same issue as you encountered). Even with overflow std, x & y set on almost everything this still occurred. This was also with width:100% on body etc.
Changing the content layer to 'relative' when I slid this across and then reducing the height of the content (while the menu was open) to the windows height seemed to work for me and seemed fairly robust over devices.
Good luck, that should help for anyone experiencing a similar issue.
Thanks,
Dave

Here's a quicky. The thing is it ONLY works if you define your modal's height. Without the height defined it won't work. Set the dialog to height 100% & overflow hidden. Then set the content to position: absolute, top: 0, bottom: 0, left: 0, right: 0, margin: auto and define the height (in below example 250px for a login modal). I know it sounds irrational - it probably is a CSS glitch, but: it works - cross browser & cross platform (haven't checked iPhone).
<div class="modal-dialog" style="height:100%;overflow:hidden"><div class="modal-content" style="position:absolute;margin:auto;top:0;bottom:0;left:0;right:0;height:250px;">

JQuery slideDown() Issue With My Need

I'm Designing a website which involves slideDown.
Initially i have set up a template which looks like the image below
When i hover over each black blocks a ul list will be displayed... But a problem arises when i hover... All the content below the block moves down (This is illustrated in the following figure)
I cant give the position to be absolute because all the content above and below are floating (They Don't have a fixed height). So what else can be done to get a slideDown by holding the rest of content there and by displaying the hover content over the text?

To achieve what you want you should slideDown() an inner submenu element instead of the block itself.
Consider this sample markup:
​<div class="item" id="mybox">floating box
<ul class="submenu" style="display: none;">
<li>Subitem 1</li>
<li>Subitem 2</li>
<li>Subitem 3</li>
</ul>
</div>
<p>More content... Just to illustrate</p>
<p>More content... Just to illustrate</p>​​​​​​
The CSS would be something like:
.​item {
position: relative; /* to hold absolutely positioned submenu inside */
background: #2684b7;
color: #fff;
padding: 10px;
float: left;
}
.item .submenu {
position: absolute; /* the menu would go on top of everything */
background: #2684b7;
width: 100%;
left: 0;
}
p {
clear: both;
}
And finally the JavaScript is simple, just don't forget to bulletproof your animation:
​
$('#mybox').hover(
function() { /* mouseover */
$(this).find('.submenu').slideDown();
},
function() { /* mouseout */
$(this).find('.submenu').slideUp();
}​​​​​
);
Here's the example on jsFiddle: http://jsfiddle.net/zxrvC/
Good luck.
​
​

Make a div with position: relative and z-index:55 and inside that div add a new div with position: absolute and also give width. Hope this will solve.
Regards
iijb

Jquery Drop Down menu blinks only on IE

I am starting a Jquery drop down menu for a new project and it is working as expected on Google Chrome, Firefox, Safari but of course it is giving me some headache on Internet Explorer.
here's the thing,
See this page
http://www.universidadedoingles.com.br/dev/index.ASP
on mouse over the menu HOME, the drop down appers, when you move over the links in IE you see some flashes of the background, which doesn't happens on Chrome and ETC.
here's the js coda I am using to do the dd menu.
<script type="text/javascript">
$(document).ready(function() {
$("ul.mainmenu li.menuhome").mouseover(function(){
$(".arrow-spacer").show(); //When mouse over ...
//Following event is applied to the subnav itself (making height of subnav 150px)
$(this).find('.submenu').show().animate({height: '150px', opacity:'1'},{queue:false, duration:300})
});
$("ul.mainmenu li.menuhome").mouseout(function(){ //When mouse out ...
//Following event is applied to the subnav itself (making height of subnav 0px)
$(this).find('.submenu').hide().animate({height:'0px', opacity:'0'},{queue:false, duration:200})
});
//menu itembackground color animation
$("li").hover(function() {
$(this).animate();},
function() {
$(".arrow-spacer").hide();
});
});
</script>
That's it, I guess it may be simple, but it's been weeks and I still can't get it to work.
Thanks a lot.

I noticed that the anchor <a> tags have a margin on them. My first thing would be to try using padding instead. IE doesn't treat a hover in the margin the same way as other browsers.

in some cases it helps to set a z-index on elements that should placed in top of other elements.
In your case I would try to set the z-index on <ul class="submenu">

No blinks anymore! I changed one word hide() to stop (), now there is no blinking on iE. but...
After you show the menu 1 time, everytime you get your mouse below the link or close the link, the menu shows up again.
check this
www.universidadedoingles.com.br/dev
you'll be able to see its behavior

The thing is that the focus to <li> is lost when you mouse over an <a> element.
Here is something you could use to overcome this. I avoided using the <a> tag, instead I used a JavaScript function to send the user to the preferred location. I used JavaScript rather than jQuery hoping to make it more self-explanatory.
<script type="text/javascript" src="jquery.js" ></script>
<script type='text/javascript'>
$(document).ready(function() {
$('#n li').hover(function() {
$('ul', this).slideDown(200);
$(this).children('a:first').addClass('h');
}, function() {
$('ul', this).slideUp(200);
$(this).children('a:first').removeClass('h');
});
});
function gotoPage(pnumber){
var goto;
if(pnumber==1){
goto="home.html";
}else if(pnumber==2){
goto="watsnew.html";
}else if(pnumber==3){
goto="aboutus.html";
}else if(pnumber==4){
goto="contactus.html";
}
window.location.href=goto;
}
</script>
<style type="text/css">
#n {
padding: 0;
list-style: none;
padding-left: 15px;
padding-right: 15px;
width:5em;
}
#n li {
/*display:inline;*/
background: none;
position: relative;
z-index: 1;
font-weight:bold;
margin: 0 auto;
}
#n li .h {
background-color: #fff;
border-left: 1px solid #CF3;
border-right: 1px solid #CF3;
color: #576482;
height:20px; }
#n ul {
position: absolute;
display: none;
margin: 0; padding: 0;
list-style: none
padding-bottom: 3px;
width:200px;
}
#n ul li {
list-style-type:none;
padding:10px;}
#n ul li:hover {
background:#960;}
</style>
<div>
<ul id="n">
<li>MENU
<ul >
<li value="1" onclick="gotoPage(this.value)">HOME</li>
<li value="2" onclick="gotoPage(this.value)">WATS NEW</li>
<li value="3" onclick="gotoPage(this.value)">ABOUT US</li>
<li value="4" onclick="gotoPage(this.value)">CONTACT US</li>
</ul>
</li>
<ul>
</div>