How to highlight div on click - css

Question

I would like to highlight a div when it's clicked.
Heres the example: www.spidex.org
On this website if you hover any of the navigation buttons a div on the top of the page is highlighted.

Answer 1

You may use jQuery for achieving this.
get jQuery here.
now consider that you have a div that you want to highlight on mouseover called item.
do this by adding an overlay div.
div.overlay{
opacity:0;
background:#000;
width:100%;
height:100%;
position:absolute;
top:50px;left:0;
}
then use jquery
jQuery(document).ready(function($){
$('.item').mouseover(function(){
$('.overlay').css({opacity:0.3});
});
});

Answer 2

You can change the appearance of elements when hovered using the :hover pseudo-class.
For example
div:hover {
color: red;
}
Secondly, you can change the text color via using the color property and the background color using the background-color property.
Both are shown below:
div:hover {
color: black;
background-color: white;
}

Answer 3

In your given example, when you hover over the primary navigation items in the super-header, then the body dims. I agree with your analysis that this is managed with some cover div of the body.
One cross-browser approach (using jQuery in this example) you might consider would be the following:
EXAMPLE HTML:
<div class="header">
Some Link
</div>
<div class="body">
<div class="body-content">
[ CONTENT HTML ]
</div>
<div class="body-cover"></div>
</div>
EXAMPLE CSS:
.body {
position: relative; /* container needs position */
}
.body-cover {
position: absolute;
top: 0px;
left: 0px;
background-color: blue;
/*
you could use a sligtly transparent background here,
or tween your opacity in your javascript
*/
}
EXAMPLE JavaScript:
// on dom ready
jQuery(function ($) {
// closures
var $links = $('.header a');
var $body = $('.body');
var $content = $body.find('.body-content');
var $cover = $body.find('.body-cover');
var sCoverHiddenCssClassName = 'body-cover-hidden';
var sCoverTweeningCssClassName = 'body-cover-tweening';
var sCoverShowingCssClassName = 'body-cover-showing';
// closure methods
var fMouseOver = function () {
// check to see if hidden (not already tweening or showing)
if ($cover.hasClass(sCoverHiddenCssClassName)) {
// check content, may have changed.
$cover.css({
height: $content.outerHeight(),
width: $content.outerWidth()
});
// animate or tween cover (do this however you want)
$cover
.removeClass(sCoverHiddenCssClassName)
.addClass(sCoverTweeningCssClassName)
.fadeIn(function () {
// when completed, mark as showing/visible
$cover
.removeClass(sCoverTweeningCssClassName)
.addClass(sCoverShowingCssClassName);
});
}
};
var fMouseOut = function () {
// check to see if visible (not already tweening or hidden)
if ($cover.hasClass(sCoverShowingCssClassName)) {
// animate or tween cover (do this however you want)
$cover
.removeClass(sCoverShowingCssClassName)
.addClass(sCoverTweeningCssClassName)
.fadeOut(function () {
// when completed, mark as showing/visible
$cover
.removeClass(sCoverTweeningCssClassName)
.addClass(sCoverHiddenCssClassName);
});
}
};
var fClick = function (e) {
// prevent default if needed for anchors or submit buttons
// e.preventDefault();
if ($cover.hasClass(sCoverHiddenCssClassName)) {
fMouseOver();
}
else if ($cover.hasClass(sCoverShowingCssClassName)) {
fMouseOut();
}
};
// init interaction
$cover.hide().addClass(sCoverHiddenCssClassName);
$links.each(function () {
// wire links
jQuery(this)
.mouseover(fMouseOver)
.mouseout(fMouseOut);//
//.click(fClick); // use click event if desired
});
});

Answer 4

JQuery UI is also gives an good option to quickly highlight div .
https://jqueryui.com/effect/
$( "#divId" ).effect( "highlight", 500 );