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css animation - zooming element from its position to center

This is an example of the effect I want:
http://photoswipe.com/
The same effect is used for image zooming on WhatsApp web.
I want to zoom elements (not just images) to the center, with an animation scaling element from its position to the center of the page.
The animation should be css based, JS should not be used for animation purposes.
I've tried the following code, which doesn't do the job:
<div></div>
With the css:
div {
width: 100px; height: 100px; background: blue;
transition: transform 1s
}
div:hover {
transform: scale(2);
}
And, what's the difference between animating transform: scale or width/height?
Thanks
EDIT:
Another attempt:
http://jsfiddle.net/4w06Lvms/

I have made something similar to what you want (view in full screen). You can modify it as per needs. Move pointer out of the screen to get back to original state.
Also, animating using scale is better as you might not know the exact height and width in pixels if there are multiple images and using the same scale value gives your code uniformity.
Hope it helps.
html,body{
margin:0;
}
.container{
background:yellow;
display:flex;
width:100vw;
height:100vh;
justify-content:center;
transition: 0.5s ease;
vertical-align:center;
}
.imageHover{
display:flex;
height:300px;
width:200px;
transition: 0.5s ease;
}
img{
position:absolute;
height:300px;
width:200px;
transition: 0.5s ease;
}
.container:hover > .imageHover{
height:100vh;
background-color:black;
width:100vw;
transition: 0.5s ease;
}
.container:hover > .imageHover > img{
transform:translate(240%,50%) scale(1.6);
transition: 0.5s ease;
}
<div class="container">
<div class="imageHover">
<img id="yo" src="https://picsum.photos/200/300
" alt="">
</div>
</div>

You can set the position of the image to fixed, but you will need to know the offset of x and y position of the image, after that start the animation.
In this case the offset x and y are 30px, because I've set parent div padding to 30px.
When the window is scrolled down or right. You have to recalculate the top and left values of the image. For that you'll need JS.
I've set the top and left to the offset values before I've set the position to fixed. Then the image starts moving at the right position.
On photoswipe, they are using a translate3d() function and they are using JS, too. I have no idea what they are doing.
#image {
/* top and left offset */
top: 30px;
left: 30px;
width: 200px;
height: 200px;
transition: top 2s, left 2s, transform 2s;
}
#image:hover {
position: fixed;
top: 50%;
left: 50%;
transform: translate(-50%, -50%);
}
#offset {
background-color: beige;
height: 1000px;
/* given offset */
padding: 30px;
}
<div id="offset">
<img id="image" src="https://picsum.photos/200/300
" alt="">
</div>

How do I add a fade to a change image mouseover event?

This is my Javascript function so far :
function changeImg (){
document.getElementById('main').style.backgroundImage = "url('./img/map/maphv.png')"
}
function changeBack () {
document.getElementById('main').style.backgroundImage = "url('./img/map/map.png')"
}
This is in the HTML :
<div id="main">
<a data-title="Africa" href="collection/africa.html" onmouseover="mouseoversound.playclip();changeImg()" onmouseout="changeBack()"><img class="africa" src="./img/map/africa.png" height="50"/> </a>
This is the CSS :
#main {
background-image: url(../img/map/map.png);
background-size: 100%;
background-repeat: no-repeat;
width: 100%;
height: 580px;
position: relative;
}
#main img.africa {
top: 244px;
left: 397px;
height: 33.5%;
position: absolute;
width: 18%;
opacity:0;
}
#main img.africa:hover {
top: 244px;
left: 397px;
height: 33.5%;
position: absolute;
width: 18%;
opacity:1;
transition: opacity .5s ease-in-out;
-moz-transition: opacity .5s ease-in-out;
-webkit-transition: opacity .5s ease-in-out;
}
So the CSS is quite irrelevant but I posted it so that you can see how the top hover is fading in and out. I just wanted to add the fade to the onmouseover event to the background map main element.
So really I just need to add the fade in the Javascript function and add that function to the mouseover event handler?
Any ideas as Javascript is not my first language.. ;)

If you can use jquery,then you can do something like
FIDDLE DEMO
$("#main").on("mouseenter", function () {
$(".africa").stop(true, true).fadeOut(); /***fadeIn or fadeOut***/
});

Ditch the Javascript
If i understand your question correctly, you want to fade between images when you hover over an element, right? This can easily be done in pure CSS.
Give the element you want to animate a background image
Add a child element that's the same size as the parent. This can be an <img>, or a span or div with a background image
Set the opacity for the child element to 0, unless someone hovers over the parent element.
HTML
<div class="fading-bg">
<img src="foo/bar.jpg" alt="stuff">
</div>
CSS
.fading-bg{
position:relative;
width: 100px;
height: 100px;
background: no-repeat center;
background-size: cover;
}
.fading-bg img{
position: absolute;
top: 0;
bottom: 0;
left: 0;
right: 0;
opacity: 0;
-webkit-transition: opacity 500ms;
transition: opacity 500ms;
}
.fading-bg:hover img{
opacity: 1;
}
Javascript is awesome, but in my personal opinion you should avoid using it for simple animations like this, as CSS is more than capable of doing it on its own.

How do I change the colour of an SVG shape using jQuery?

Hi, folks! New here! Hoping to contribute a fair amount to the community in the future. But first, I need a hand with something I imagine to be fairly simple!
I've always been all about the design aspect of the web, so mainly concentrated on HTML and CSS. I've only recently started looking in to learning JavaScript/jQuery, so bear with me, haha!
I'm having a little trouble with changing the colour of an SVG shape using jQuery. The basic idea is that when the user scrolls down the page, certain elements will change colour. The HTML elements change as expected, but the SVG properties don't. I've read something about SVG DOM being different to HTML DOM, but can't really make much sense of it? A small explanation along with any help wouldn't be ignored!
Here is my HTML:
<header>
<div id="headercontainer">
<object id="logo" type="image/svg+xml" data="images/kennyheardlogo.svg"></object>
<nav><a id="homelink" href="index.html">HOME</a> | <a id="aboutlink" href="index.html">ABOUT</a> | <a id="worklink" href="index.html">WORK</a> | <a id="sociallink" href="index.html">SOCIAL</a></nav>
</div>
</header>
Here is my CSS:
header {
position: fixed;
z-index: 1;
width: 100%;
height: 150px;
background-color: #ffffff;
-webkit-box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.5);
-moz-box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.5);
box-shadow: 0px 5px 10px 0px rgba(0,0,0,0.5);
opacity: 0.8;
-webkit-transition: background-color 0.5s ease;
-moz-transition: background-color 0.5s ease;
transition: background-color 0.5s ease;
}
.headerfade {
background-color: #000000;
}
nav {
position: absolute;
top: 65px;
right: 40px;
width: 480px;
height: auto;
color: #000000;
text-align: center;
letter-spacing: 10px;
font-size: 10px;
}
nav, nav a {
-webkit-transition: color 0.5s ease;
-moz-transition: color 0.5s ease;
transition: color 0.5s ease;
}
.navfade {
color: #ffffff !important;
}
#icon {
fill: #000000;
}
.iconfade {
fill: #ffffff;
}
#letterk, #letterh {
fill: #ffffff;
}
#text path {
fill: #000000;
}
Here is my jQuery:
$(window).scroll(function() {
var scroll = $(window).scrollTop();
if (scroll >= 350) {
$("header").addClass("headerfade");
$("nav, nav a").addClass("navfade");
$("#icon").addClass("iconfade");
} else {
$("header").removeClass("headerfade");
$("nav, nav a").removeClass("navfade");
$("#icon").removeClass("iconfade");
}
});
The initial colour of "#icon" is black, but when the user scrolls 350px from the top of the page, I want the colour to change to white. That is what I have done with the "header" and "nav" elements, which worked perfectly. So, any ideas?
I'm hoping I've not missed something embarrassingly obvious, haha!
Thanks for any help you can provide, guys!

There are two things wrong here.
You can't directly access the contents of an <object> like that. You need to get the contentDocument and access it that way.
CSS doesn't work across document boundaries. Even once you add the iconfade class to #icon, it won't be able to see it because the CSS is in a different document.
What you can do is inline the SVG file in your HTML. It should work then.

Vertically center a button inside a responsive container with pure CSS?

So I want to make this thumbnail effect.
$(window).resize(setThumbHeight);
$(window).resize(centerBtn);
SEE HERE
As you can see I wrote some JQuery to set the container height and center the btn, which I think is pretty dumb.
I have a few questions:
1. How can I maintain the aspect ratio of the container without using JQuery.
2. How could I center the button vertically inside the container using pure CSS? (It seems someone had it done with table and table-cell)
3. Why background url is not working? (I have the line commented out in the CSS.)
Thanks guys.

Here's a simple cross-browser method to achieve what you're looking to do:
http://codepen.io/aecend/pen/KEvBa
I didn't bother with any of the CSS transitions, just focused on the centering. To maintain the container dimensions, only set the width of the outer thumbnail container, the height will automatically flex to fit. Also, the background url does seem to be working, the image itself was covering the background in your fiddle.
HTML
<div class="thumbnail">
<img src="http://placekitten.com/300/200">
<div class="mask center-in-container"></div>
<button class="button center-in-container">Enter</button>
</div>
CSS
.thumbnail {
width: 30%;
position: relative;
}
img {
display: block;
width: 100%;
height: 100%;
}
.center-in-container {
position: absolute;
margin: auto;
top: 0;
bottom: 0;
right: 0;
left: 0;
}
.button {
width: 50px;
height: 30px;
display: none;
}
.mask {
background-color: rgba(0,0,0,0.3);
display: none;
}
.thumbnail:hover .button {
display: block;
}
.thumbnail:hover .mask {
display: block;
}

You can center an element vertically with this trick:
change value of margin if you change width or height of your button.
-17px is half of height and -30px is half of width
.thumbnail-mask .btn{
position:absolute;
top:50%;
left:50%;
margin:-17px -30px;
}
and for zoom on picture you can use this:
.my-thumbnail:hover img{
-webkit-transform:scale(1.5);
-moz-transform:scale(1.5);
-o-transform:scale(1.5);
-ms-transform:scale(1.5);
transform:scale(1.5);
}
and if you want display your picture with background css property, you must have height on your container .my-thumbnail.

Hashbug,
Aside from a JavaScript method, which, you have employed - there are no dynamic, cross-browser compatible solutions for what you are attempting to do.
If you still do not wish to use JavaScript, and are O.K. with this not working cross-browser, then you may want to take a look at CSS3's flexbox. As I said the flexbox is not supported by all browser versions yet, you can find out which here: caniuse.com. I made a fiddle to show your solution updated with flexbox here:
http://jsfiddle.net/jpatterson69/z8uCK/
.thumbnail-mask {
display: flex;
align-items: center;
justify-content: center;
z-index: 1;
width: 100%;
height: 100%;
text-align: center;
background: rgba(0,0,0,0.4);
opacity: 0;
-webkit-transition: opacity 0.3s ease-out;
-moz-transition: opacity 0.3s ease-out;
-o-transition: opacity 0.3s ease-out;
-ms-transition: opacity 0.3s ease-out;
transition: opacity 0.3s ease-out;
}
I did not include any of the "hacks" as other users have posted because they generally will cause you much more strife than is needed - your solution is the easiest compared to these. May I ask why you need to use the flexbox?

How to zoom out a div using animations?

I have a DIV that is covering the whole page (height and width are 100%). I am trying to use CSS (and possibly JavaScript) to create a zoom out animation effect so the DIV is smaller (making everything inside the div - its children - smaller as well) to a specific point on the page (middle of the page) and to a specific width and height (let's say 100 * 100px for example).
I am starting with the following code:
<div id="toBeZoomedOut">
<div>something</div>
<div><img src="background.jpg"></div>
</div>
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
-webkit-transition: 1s ease-in-out;
-moz-transition: 1s ease-in-out;
transition: 1s ease-in-out;
}
#toBeZoomedOut img {
height: 250px;
width: 250px;
}
#toBeZoomedOut:hover {
zoom: 0.5;
}
The issue with this code is that it zooms out on component down (the parent div) and immediately zooms out what's inside it then goes back to zoom in the components.
Basically it is a little buggy. Any helpful fixes to make it zoom out everything together? It would be great if I can zoom out everything together to a specific location on the page and to a specific width/height (for example, zoom everything out to left: 100px, top: 100px and the parent div should be: 100px * 100px and everything else is relative in size).
I understand this might be easier with JavaScript? Any help?
One final note, if you notice the animation is not really reflecting a zoom animation. Although this would be an additional plus, the actual zoom animation would be great.
JSFiddle link to make it easier: http://jsfiddle.net/HU46s/

I am using the universal selector to target everything inside of the parent container to have the css transitions applied to it.
The next thing I did was changed the inside contents width to a % for ease of scaling.
Here is the css:
#toBeZoomedOut * {
-webkit-transition: all 1s ease;
-moz-transition: 1s ease;
transition: 1s ease;
}
Finally, a fiddle: Demo

To make all images and div backgrounds zoom at the same time you have to use percentage size for #zoomer-inside elements and set a specific font-sizes...
However is not smooth, if you want a smoother result, I suggest you use a jQuery in combination with some animation() method or plugin.
Fiddle: http://jsfiddle.net/HU46s/1/
Code:
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
-webkit-transition: all 1s ease-in-out;
-moz-transition: all 1s ease-in-out;
transition: all 1s ease-in-out;
}
#toBeZoomedOut div, #toBeZoomedOut img {
width: 90%;
font-size: 20px;
}
#toBeZoomedOut img {
height: 90%;
width: 90%;
}
#toBeZoomedOut:hover {
zoom: 0.5;
}
smoother by jQuery:
Fiddle: http://jsfiddle.net/HU46s/5/
Code:
jQuery - smoother solution (even less CSS):
$('#toBeZoomedOut').hover( /* change the animation speed as you want :) */
function(){
$(this).animate({ 'zoom': 0.5}, 400); //animation speed 400=0.4s !
},
function(){
$(this).animate({ 'zoom': 1}, 400); //animation speed 400=0.4s !
}
);
...with this only CSS you need is:
#toBeZoomedOut {
background-color: black;
border: 1px solid #AAAAAA;
color: white;
width: 300px;
height: 300px;
margin-left: auto;
margin-right: auto;
}
#toBeZoomedOut img {
width: 250px;
}