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Transition on image width does not work with window scroll

i have a logo image in sticky topbar menu so when scrolling down i'm trying to change the image width using css transition but it is not working with jquery window scroll when i add the css class to logo image but when i hover on the logo image it work
my code css
.logo img
{
width: 100%;
transition:width 1s ease;
-moz-transition: width 1s ease;
-ms-transition: width 1s ease;
-webkit-transition: width 1s ease;
-o-transition: width 1s ease;
}
.transition , .logo img:hover{
width: 50%;
transition:width 1s ease;
-moz-transition: width 1s ease;
-ms-transition: width 1s ease;
-webkit-transition: width 1s ease;
-o-transition: width 1s ease;
}
js code
$j = jQuery.noConflict();
$j(function(){
$j(window).on("scroll", function () {
if ($j(this).scrollTop() > 100) {
$j('.logo img').addClass('transition');
console.log($j(this).scrollTop());
} else {
$j('.logo img').removeClass('transition');
console.log('cvc');
}
});
});
please any help and many thanks in advance.

You wants something like this ?
Just changed your selectors a bit. Because of the inheritance of .logo img, .transition wasn't suffisant to erase .logo img properties.
.logo img
{
width: 100%;
transition:width 1s ease;
-moz-transition: width 1s ease;
-ms-transition: width 1s ease;
-webkit-transition: width 1s ease;
-o-transition: width 1s ease;
}
.logo .transition{
width: 50%;
transition:width 1s ease;
-moz-transition: width 1s ease;
-ms-transition: width 1s ease;
-webkit-transition: width 1s ease;
-o-transition: width 1s ease;
}

Carousel loose responsive behaviour with "image in div" zooming on hoover effect

Using flickity carousel I've created the following example here in codepen.io link. Here is CSS code I've implemented:
CSS
.image-hoover {
overflow: hidden;
}
.image-hoover img {
-moz-transform: scale(1.02);
-webkit-transform: scale(1.02);
transform: scale(1.02);
-webkit-transition: all 10s ease;
-moz-transition: all 10s ease;
-o-transition: all 10s ease;
-ms-transition: all 10s ease;
transition: all 10s ease;
}
.image-hoover:hover img {
-moz-transform: scale(1.06);
-webkit-transform: scale(1.06);
transform: scale(1.06);
-webkit-transition: all 10s linear;
-moz-transition: all 10s linear;
-o-transition: all 10s linear;
-ms-transition: all 10s linear;
transition: all 10s linear;
}
The issue I can't figure out is that images loose responsive behavior only until I turn off this part:
.image-hoover img {
-moz-transform: scale(1.02);
-webkit-transform: scale(1.02);
transform: scale(1.02);
-webkit-transition: all 10s ease;
-moz-transition: all 10s ease;
-o-transition: all 10s ease;
-ms-transition: all 10s ease;
transition: all 10s ease;
}
But in this case when you unhover the image returns back to it size very fast loosing the transition effect, can you please suggest how to figure out this issue?
1. Here the responsive behavior of image is present, but zoom effect on hoover loose transition.
2. In this example you can notice that transition works great, but if you resize the window images loose their responsive behaviour.

It happens because you said for the transition to apply on all actions, so the 10s transition happens also when the images change thier when the screen changes width.
You will need to change
-webkit-transition: all 10s ease;
-moz-transition: all 10s ease;
-o-transition: all 10s ease;
-ms-transition: all 10s ease;
transition: all 10s ease;
to
-webkit-transition: -webkit-transform: 10s ease;
-moz-transition: -moz-transform 10s ease;
-o-transition: transform 10s ease;
-ms-transition: transform 10s ease;
transition: transform 10s ease;
And remove the transition from the :hover.
This will now work.
Fiddle-http://codepen.io/anon/pen/eJWQRq?editors=110

Change Opacity in Animation

I'm trying to change the opacity of the hover effect at http://3e6.864.myftpupload.com/. I tried changing the opacity in CSS, but it doesn't seem to take effect.
.isotope .isotope-item {
filter: alpha(opacity=90);
opacity: 0.9;
-webkit-transition-property: -webkit-transform, opacity;
-moz-transition-property: -moz-transform, opacity;
-ms-transition-property: -ms-transform, opacity;
-o-transition-property: -o-transform, opacity;
}

If you're trying to achieve this effect on hover of the element you need to use the :hover selector in your CSS and set the transition attribute:
.isotope .isotope-item:hover {
filter: alpha(opacity=90);
opacity: 0.9;
-webkit-transition: opacity 0.5s ease-in-out;
-moz-transition: opacity 0.5s ease-in-out;
-ms-transition: opacity 0.5s ease-in-out;
-o-transition: opacity 0.5s ease-in-out;
}
Example fiddle

Animate addition of a class through jquery/javascript

I have:
<div class="button" id="button1">Click</div>
<div class="button" id="button2">Click</div>
and the JS
$('.button').click(function(){
$('.button').removeClass('selected');
$(this).addClass('selected');
});
CSS
.selected {
background-color: green;
}
Can I 'animate' the applying of the class 'selected'? I.e on a click of the div, the background slides in from the right or fades in for example? Is there a decent plugin available that could achieve this? Is there are a CSS workaround/method?

Simply use CSS3
-webkit-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
transition: all 0.5s ease;
Example
http://jsfiddle.net/tw16/JfK6N/
if you don't want to use CSS3 to support older Browsers use the done() callback of animate
$('.button').click(function() {
$('.button').removeClass('selected');
$(this).animate({
backgroundColor: green
}, 1000, "linear", function() {
$(this).addClass('selected');
});
});

You can use css3 for that. Use transition to background color change.
-webkit-transition: all 0.3s ease;
-moz-transition: all 0.3s ease;
-o-transition: all 0.3s ease;
-ms-transition: all 0.3s ease;
transition: all 0.3s ease;
Here is the example with your code:
http://jsfiddle.net/mm9mV/

FadeIn and FadeOut with Javascript and no Jquery

I have an image map and when the user hovers over the map I want to fade-in a small div with informations on the hovered content, then upon the mouse leaving the map fade-out with a two second delay.

It's possible to do a fade effect by animating opacity using CSS transitions:
.small_div {
opacity: 0;
-webkit-transition: opacity 1s;
-ms-transition: opacity 1s;
-moz-transition: opacity 1s;
-o-transition: opacity 1s;
transition: opacity 1s;
}
.small_div.active {
opacity: 1
}
To use this class, you will need to have some javascript to add the .active class when the image map is hovered and fill the .small_div with the necessary data.
IF you don't want to use a class, you can just change the opacity property directly using javascript and that change will also be animated.
Note that this will not work in older browsers like IE8, but it should degrade gracefully.

Unlike nullability suggests, you can do this fully with only CSS including the delay, no added classes involved. Here is a fiddle to prove it
HTML:
<div id='map'>
<div id='overlay'></div>
</div>
CSS:
#map {
height:100px;
width:100px;
background:red;
}
#overlay {
z-index:2;
background:black;
height:100px;
width:100px;
opacity:0;
-webkit-transition: opacity 1s;
-ms-transition: opacity 1s;
-moz-transition: opacity 1s;
-o-transition: opacity 1s;
transition: opacity 1s;
transition-delay: 2s;
-webkit-transition-delay: 2s;
}
#overlay:hover {
opacity:.8;
transition-delay: 0s;
-webkit-transition-delay: 0s;
}