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Highlight area with backgroundcolor fadein/fadeout

Hi I'd like to highlight .small. Do not have access to add jQuery UI e.g. can't use .animate.
HTML
<span class="small">10 left</span>
jQuery
$(".small").css("background-color","orange");
Question: How do I add background-color orange and make it .fadeOut() here? This below doesn't work? Only want to fadeout the background color, nothing else.
$(".small").css("background-color","orange").fadeOut();

you can use CSS animations to do that
see snippet below
span {
background-color:orange;
animation-name:bckanim;
animation-fill-mode:forwards;
animation-duration:3s;
animation-delay:0s;
}
#keyframes bckanim {
0% {background-color:orange;}
100% { background-color:transparent;}
}
<span class="small">10 left</span>

You can use timeouts and css transitions nicely for this.
For more information about transitions:
https://developer.mozilla.org/en-US/docs/Web/CSS/CSS_Transitions/Using_CSS_transitions
$(document).ready(function(){
var $block = $('.block');
/** first timeout to make the document do its stuff before this thing runs **/
window.setTimeout(function() {
$block.addClass('orange-fade');
/** second timeout to turn it back to normal **/
window.setTimeout(function() {
$block.removeClass('orange-fade');
},2000);
},1000);
});
.block {
display:block;
width:200px;
height:200px;
background-color:green;
/** Transitions to give a nice effect **/
-webkit-transition: background-color 1000ms linear;
-moz-transition: background-color 1000ms linear;
-o-transition: background-color 1000ms linear;
-ms-transition: background-color 1000ms linear;
transition: background-color 1000ms linear;
}
.orange-fade {
background-color: #AD310B;
-webkit-transition: background-color 1000ms linear;
-moz-transition: background-color 1000ms linear;
-o-transition: background-color 1000ms linear;
-ms-transition: background-color 1000ms linear;
transition: background-color 1000ms linear;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class=" block transition">
Look at me! Look at you! now look back to me! i'm on a horse!
</div>

You can do something like this with css transitions on a class and then add or remove the class with JS.
HTML:
<span class="small">10 left</span>
CSS:
.small {
background-color: #fff;
transition-property: background-color;
transition-duration: 1s;
transition-delay: 1s;
}
.orange {
background-color: orange;
}
JS:
$(".small").addClass("orange");
DEMO https://jsfiddle.net/ry5qxvos/

try this http://jsfiddle.net/x2jrU/92/ use this jquery to make background color of ur wish with fadein/fadeout option.
jQuery.fn.highlight = function() {
$(this).each(function() {
var el = $(this);
el.before("<div/>")
el.prev()
.width(el.width())
.height(el.height())
.css({
"position": "absolute",
"background-color": "#ffff99",
"opacity": ".9"
})
.fadeOut(500);
});
}
$("#target").highlight();
#target { width: 300px; height: 100px; border: 1px solid red; }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="target">Highlight Me</div>

Add transition while changing img src with javascript

I have an img tag that I want to change the src when hover and it all works but i would like to add some transition so it doesn't look so rough but since it's an img src i cant target it with css.
http://jsfiddle.net/Ne5zw/1/
html
<img id="bg" src="img/img1.jpg">
<div onmouseover="imgChange('img/img2.jpg'); "onmouseout="imgChange('img/img1.jpg');">
js
function imgChange(im){
document.getElementById('bg').src=(im);
}

You want a crossfade. Basically you need to position both images on top of each other, and set one's opacity to 0 so that it will be hidden:
<div id="container">
<img class="hidden image1" src="http://www.istockphoto.com/file_thumbview_approve/4629609/2/istockphoto_4629609-green-field.jpg">
<img class="image2" src="http://www.istockphoto.com/file_thumbview_approve/9958532/2/istockphoto_9958532-sun-and-clouds.jpg" />
</div>
CSS:
.hidden{
opacity:0;
}
img{
position:absolute;
opacity:1;
transition:opacity 0.5s linear;
}
With a transition set for opacity on the images, all we need to do is trigger it with this script:
$(function(){
debugger;
$(document).on('mouseenter', '#hoverMe', function(){
$('img').toggleClass('hidden');
});
});
http://jsfiddle.net/Ne5zw/12/

Here is a pure css solution using css transition. You can use a div as the container and set the background-image on hover.
.image-container {
background: url(http://placeholder.pics/svg/300x300/DEDEDE/555555/Old%20Image) center center no-repeat;
background-size: contain;
width: 150px;
height: 150px;
-webkit-transition: all .3s ease-in-out;
-moz-transition: all .3s ease-in-out;
transition: all .3s ease-in-out;
}
.image-container:hover {
background-image: url("http://placeholder.pics/svg/300x300/DEDEDE/555555/New%20Image");
}
<div class="image-container"></div>

Just in case someone is curious how to actually create a transition-like effect when you are actually changing the source attribute of an image, this was the solution I came up with.
Javascript:
var bool = false;
setInterval(() => {
bool = !bool;
let imgSrc = bool ? 'hero-bg2.jpg' : 'hero-bg.jpg'; // Toggle image
$('.parallax-slider').addClass('transitioning-src'); // Add class to begin transition
setTimeout(() => {
$('.parallax-slider').attr('src', `https://website.com/images/${imgSrc}`).removeClass('transitioning-src');
}, 400); // Ensure timeout matches transition time, remove transition class
}, 6000);
CSS:
.parallax-slider {
transition: opacity 0.4s ease-in;
-webkit-transition: opacity 0.4s ease-in;
-moz-transition: opacity 0.4s ease-in;
-ms-transition: opacity 0.4s ease-in;
-o-transition: opacity 0.4s ease-in;
opacity: 1;
}
.transitioning-src {
transition: opacity 0.4s ease-out;
-webkit-transition: opacity 0.4s ease-out;
-moz-transition: opacity 0.4s ease-out;
-ms-transition: opacity 0.4s ease-out;
-o-transition: opacity 0.4s ease-out;
opacity: 0;
}
This will give the illusion of 'fading to black and back' between images - even if you're using something like parallax.js where you have a data-attribute driven component that renders out into a dynamic image. Hope it helps someone.

Fixed Mister Epic solution's images in this jsfiddle.
HTML
<div id="container">
<img class="hidden image1" src="http://placeholder.pics/svg/300x300/DEDEDE/555555/Old%20Image">
<img class="image2" src="http://placeholder.pics/svg/300x300/DEDEDE/555555/New%20Image" />
</div>
<div id="hoverMe">hover me</div>
CSS
div#hoverMe {
background-color:yellow;
width:50px;
height:50px;
position:fixed;
top:300px;
}
div#container{
position:relative;
height:200px;
}
.hidden{
opacity:0;
}
img{
position:absolute;
opacity:1;
transition:opacity 0.5s linear;
}
JS
$(function(){
$(document).on('mouseenter', '#hoverMe', function(){
$('img').toggleClass('hidden');
});
});

Image/div flicker on hover in google chrome

I'm animating the images so that when hovered over the opacity goes up to 1, that part is working perfectly fine however when images are hovered over in chrome the 2nd column flickers a tiny bit to the side. I've tested it in IE and Firefox aswell and have no issues.
Check it for yourself here: http://abmenzel.com/work/
HTML:
<body class="blue4">
<div class="content">
<div class="work-item blue4">
<img src="img/Template-2-Intro.png"/>
</div>
</div>
</body>
CSS:
.work-item{
width:25%;
opacity:0.8;
overflow:hidden;
display:block;
float:left;
}
img{
width:100%
}
.work-item:hover{
opacity:1;
-webkit-transition: all 0.2s ease-in-out 0s;
-moz-transition: all 0.2s ease-in-out 0s;
-o-transition: all 0.2s ease-in-out 0s;
-ms-transition: all 0.2s ease-in-out 0s;
transition: all 0.2s ease-in-out 0s;
}
I'm also using a script to set the height equal to the dynamic width, which might have something to do with it but I am unsure..
SCRIPT:
$(function() {
var div = $('.work-item');
var width = div.width();
div.css('height', width-5);
});

First of all, put your transition properties in normal element, not on :hover state.
Then, if you need only transition on opacity, use :
opacity 0.2s ease-in-out 0s
That flicker is a known bug in Webkit browsers, it happens when you animate opacity on fluid elements (here 25%).
Here's a workaround:
-webkit-backface-visibility: hidden;
-webkit-transform: translateX(0);
I know it sounds like a hack, but it works...

I use translate3D instead of translateX:
img {-webkit-transform: translate3D(0,0,0);}

jQuery on hover opacity

I have tried and failed to get this working. Basically I am trying to get it so that when you hover over one div, it should change the sibling's opacity to 0.5 that has class="receiver".
If you see this jsFiddle, there are 2 divs with class="outerwrapper", and both contain 2 divs of classes hover and receiver. When you hover over the div with class hover, the receiver's opacity should be set to 0.5, but only the one inside the same div (outerwrapper).
Any help would be much appreciated. Thanks in advance.

You don't need to use jQuery, or JavaScript, for this (though you can1), CSS is quite capable in most browsers of achieving the same end-result:
.hover:hover + .receiver {
opacity: 0.5;
}
JS Fiddle demo.
And also, even with 'only' CSS, in modern/compliant browsers, it's possible to use fade transitions (or, strictly speaking, to transition the opacity):
.receiver {
width: 50px;
height: 50px;
background-color: blue;
opacity: 1;
-webkit-transition: opacity 1s linear;
-o-transition: opacity 1s linear;
-ms-transition: opacity 1s linear;
-moz-transition: opacity 1s linear;
transition: opacity 1s linear;
}
.hover:hover + .receiver {
opacity: 0.5;
-webkit-transition: opacity 1s linear;
-o-transition: opacity 1s linear;
-ms-transition: opacity 1s linear;
-moz-transition: opacity 1s linear;
transition: opacity 1s linear;
}
​
JS Fiddle demo.
I was going to provide a JavaScript/jQuery solution as well, but there are several others already posted, now, and I'd rather not repeat other people's answers in my own (it just feels like plagiarism/copying).

Something like this would do it: http://jsfiddle.net/UzxPJ/3/
$(function(){
$(".hover").hover(
function(){
$(this).siblings(".receiver").css("opacity", 0.5);
},
function(){
$(this).siblings(".receiver").css("opacity", 1);
}
);
});​
References
.siblings() - Get the siblings of an element - http://api.jquery.com/siblings/
.hover() - Catch the mouseover/mouseout events - http://api.jquery.com/hover/

$('.hover').hover(function() {
$(this).next('.receiver').css('opacity', 0.5);
}, function() {
$(this).next('.receiver').css('opacity', 1.0);
});
http://jsfiddle.net/2K8B2/
(use .siblings or .nextAll if the .receiver is not necessarily the next element)

This works:
​$(document).ready(function() {
$('.hover').hover(function() {
var $parent = $(this).parent('.outerwrapper');
$parent.find('.receiver').css({ opacity : 0.5 });
}, function() {
var $parent = $(this).parent('.outerwrapper');
$parent.find('.receiver').css({ opacity : 1 });
});
});​

expand div height onmouseover

I need height on the div 50px in default and it has to be changed to 300px onmouseover. I coded in below manner to implement it.
<style type="text/css">
#div1{
height:50px;
overflow:hidden;
}
#div1:hover{
height:300px;
}
</style>
<body>
<div id="div1"></div>
</body>
This code is working fine but as per CSS property on hover its immediately changing its height. Now, I need a stylish way like slowly expanding div onmouseover and contracting onmoveout. How to expand and contract div on hover?

There are a few approaches -- here is CSS and Jquery, which should work in all browsers, not just modern ones:
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script>
$(document).ready(function() {
$("#div1").hover(
//on mouseover
function() {
$(this).animate({
height: '+=250' //adds 250px
}, 'slow' //sets animation speed to slow
);
},
//on mouseout
function() {
$(this).animate({
height: '-=250px' //substracts 250px
}, 'slow'
);
}
);
});
</script>
<style type="text/css">
#div1{
height:50px;
overflow:hidden;
background: red; /* just for demo */
}
</style>
<body>
<div id="div1">This is div 1</div>
</body>

#div1{
-webkit-transition: all .3s ease-in-out;
-moz-transition: all .3s ease-in-out;
-o-transition: all .3s ease-in-out;
-ms-transition: all .3s ease-in-out;
transition: all .3s ease-in-out;
}
Easy!

In a "modern" browser, you can just apply a css transition effect:
#div1 {
-moz-transition: 4s all ease-in-out;
-ms-transition: 4s all ease-in-out;
-webkit-transition: 4s all ease-in-out;
-o-transition: 4s all ease-in-out;
}
This would apply a transition effect over 4 seconds with a ease-in-out easing for compatible firefox, ie, chrome/safari (webkit) and opera browser. Read more:
CSS Transitions
You can take this one step ahead and check if the current browser supports css transitions, if available, use them for animation and if not use a javascript animation script. Example for that:
BarFoos animations

You can use jQuery's .animate() This will act on any element with with a class of "tab", and will revert on mouse-out.
$('.tab').hover(function() {
$(this).stop()
$(this).animate({
height: '+=250'
}, 500)
}, function() {
$(this).stop()
$(this).animate({
height: '-=250'
}, 500)
})

You can use jquery's .mouseover http://api.jquery.com/mouseover/, .mouseout http://api.jquery.com/mouseout/, and .animate http://api.jquery.com/animate/ to perform that.
On the .mouseover event, you would animate the height to be 300px, and on the .mouseout event you would animate to 50px. Make sure you call .stop on the div before you call animate, otherwise you will have odd issues.