Develop Reference

How to Change Entire Navbar Color When Hovering on Element in a Navbar

I am setting up my own website, and before I do that, I am working on understanding what I want to do following along with a W3 Schools tutorial.
When you click open, it brings up the overlay properly, and when you hover over the text in the overlay, the text changes color, but I want to make it so that when you hover over text, the background of the overlay changes to an image. As it stands the overlay color is gray, but when I hover over something say "dogs" I want the background to be replaced by a picture of a dog.
I have tried to use the CSS :hover function but was only able to have it change the background-color of the individual navbar element, not the whole overlay.
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
background-color: red;
}
This only changes the background color of the navbar element.
https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_sidenav_push
Here is the link to the w3 schools tryIt site, to see the rest of the code.

In CSS you can not change the style of a parent element by Hovering a children element.
You will need Javascript.

I was able to figure it out, by using JQuery, and this is the code that ended up working for me.
<script>
$(".about").hover(function(){
$(this).parent().parent().css("background","red");
});
$(".about").mouseleave(function(){
$(this).parent().parent().css("background","blue");
});
</script>
So basicaly what is happening here is that I have a navbar, which has different links in it each with there own class (for example as you can see here "about" is one). And what I have JQuery do is when you hover over a specific element, it changes the background of the parent attribute.
Note I had to do .parent().parent() because of the way I have it setup, it may be possible to do it with just one .parent().
And then what happensis when you hover over the element in the class it will changed the css of the parent attribute, and then when you the mouse exits the element, the background will go back to what it was originally, so in this case blue.
I hope this helps anyone if they ever have a similar question!

Picture color overlay in CSS

Hello I have a picture made in photoshop. It's only one color (symbol of html). It's made from #d66a00 (shade of orange) color. I need to add effect on hover, that picture slowly pass to another color.
For example. I have a picture on site, it is orange. When I go with mouse over the picture, he will change from orange to blue. Is something like this possible with CSS3, or javascript, or I will need to use two pictures and change background in CSS?

EDIT In response to your reply:
Then you have three options.
First option is like you suggested to create two images, put them behind eachother and use css to change the opacity of the front image. This method is the worst for page loading time.
The second option is to change the image in Photoshop in such a way so that the dark orange part is transparent (0% opacity) and the light orange part is transparent white, with about 10% opacity.
In css then, put a background on the image of #d66a00. On hover, change this background to blue.
The last option is to use an svg of the image (like https://upload.wikimedia.org/wikipedia/commons/6/61/HTML5_logo_and_wordmark.svg)
and to embed it in the html (see http://www.w3schools.com/svg/svg_inhtml.asp) So you copy the entire svg code inside the html. Then you can manipulate all the parts of the svg using css. You can add classes to svg elements, and using css, change their 'fill' (which is background in svg)
first answer:
If I understand correctly, your picture is an rectangle that is uniformly the color #d66a00?
In that case you can create a div with this color as a background, instead of using an image. And then on hover, change the color.
<style>
.orange-rectangle{
background-color:#d66a00;
width:5em;
height:5em;
transition:background-color 200ms;
}
.orange-rectangle:hover{
background-color:blue;
}
</style>
<div class="orange-rectangle"></div>

The way I handle this is by creating two images and hiding/displaying the images on hover.
The image holder div holds the images you want to replace - and when it is hovered over the image with the class defaultImage disappears and is replaced by the image with class hoverImage.
<style>
.imageHolder .defaultImage {
display:inherit;
}
.imageHolder .hoverImage{
display:none;
}
.imageHolder:hover .defaultImage {
display:inherit;
}
.imageHolder:hover .hoverImage{
display:none;
}
</style>
<div class = 'imageHolder'>
<img src = 'path/to/first/image.jpg' class = 'defaultImage'>
<img src = 'path/to/second/image.jpg' class = 'hoverImage'>
</div>

Darken Background - Without affecting elements itself. (Overlay?)

I want to darken my background. Normally, its as simple as putting an overlay with a lower z-index than the most front element like seen here:
(source: jankoatwarpspeed.com)
What I want to achieve now is to make the elements behind the overlay STILL be clickable, selectable and so on.
In this example, the links should be clickable, and the text above should be selectable, but STILL be this dark.
I guess I cant archive this with pure CSS, what would be your solution?
Thanks

Just disable pointer events on your overlay:
pointer-events: none;
Example:
http://codepen.io/anon/pen/ebcdz

See this fiddle.My technique is to add the same elements to the overlay div and to set the color of text of the href text to the background color of overlay so that it appears invisible.See this fiddle.
http://jsfiddle.net/5Ux5t/1/
CSS for href within overlay div to make it invisible
#overlay a{
color:black;
}
Actually there are links in the overlay too.I just added the above CSS to make them invisible.See this:
http://jsfiddle.net/5Ux5t/

Is this jQuery?

If you hover the images, an orange magnifier pops up.
http://disqus.com/features/
Clicking on the images opens a pop up.
Is that a jQuery plugin that does this and the orange magnifier on hover?

No. it's just CSS's property (pseudo-class) :hover

The magnifier is plain css :hover, while the popup is done using Facebox, which is a jQuery plugin.

You can see the css for that effect here: http://mediacdn.disqus.com/1308880185/css/marketing.css
Search for #feature-explorer ul li:hover .frame span

how do I make rounded corners on hovers?

I'm making a theme for wordpress. My navigation bar has rounded corners like apple's site. I want to add a hover style to it, but I can't get it to hover with rounded corners, like apple's nav bar does. I'm using a big image for the background and using wordpress 3's menu system. So, how can I hover the first and last item on the bar? Thanks for helping.

With javascript you can select and change whatever you want but if you just want to use css, you´ll have to apply the :hover to the parent of all button sub-elements so that you can select all sub-elements using css. However, that excludes older versions of IE as they don´t support :hover on elements other than a tags.
Example:
.button:hover {
//
}
.button:hover .main_section {
// change to main section of button on hover
}
.button:hover .left_part {
// change to left side on hover
}
.button:hover .right_part {
// change to right side on hover
}

You'll have to have a different background image for the "hover" style.