Develop Reference

Is there a way to make an element spin around without a variable telling how far it has already turned?

I have an experimental website that plays music, and I want the forward and backward buttons to spin when you click them. But, I also don't want to have 2 variables to be how far they have turned, or a function to get how far they have turned from the CSS transform property. They have a transition, for hover effects. I have tried
backward.classList.add("notrans");
backward.style.transform = "rotateZ(0deg)";
backward.classList.remove("notrans");
backward.style.transform = "rotateZ(-360deg)";
and some closely related things, and also have a setTimeout to reset it afterwards, which it too long for a post.

Animate is what you are searching for.
This should be a working example: (Tested in FF and Chrome)
/* THIS IS A JAVASCRIPT CLASS THAT ADDS AND
REMOVES THE CSS CLASS FROM YOUR ELEMENT
USING THE ELEMENT'S ID VALUE TO REFERENCE. */
function startStop(strstp) {
var infinite = document.getElementById("imSpinning");
var once = document.getElementById("imSpinningOnce");
if(strstp == 1)
{
infinite.classList.add("spin");
once.classList.add("spinOnce");
timer = setTimeout(function() {
once.classList.remove("spinOnce");
},1000);
}
else
{
infinite.classList.remove("spin");
once.classList.remove("spinOnce");
}
}
/* THIS IS THE CSS CLASS THAT CREATES INFINITE ROTATION */
.spin {
-webkit-animation:spin 1s linear infinite;
-moz-animation:spin 1s linear infinite;
animation:spin 1s linear infinite;
}
#-moz-keyframes spin { 100% { -moz-transform: rotate(360deg); } }
#-webkit-keyframes spin { 100% { -webkit-transform: rotate(360deg); } }
#keyframes spin { 100% { -webkit-transform: rotate(360deg); transform:rotate(360deg); } }
/* THIS IS THE CSS CLASS THAT ROTATES ONCE */
.spinOnce {
-webkit-animation:spin 1s linear;
-moz-animation:spin 1s linear;
animation:spin 1s linear;
}
#-moz-keyframes spinOnce { 100% { -moz-transform: rotate(360deg); } }
#-webkit-keyframes spinOnce { 100% { -webkit-transform: rotate(360deg); } }
#keyframes spinOnce { 100% { -webkit-transform: rotate(360deg); transform:rotate(360deg); } }
<div style="width: 100px; height: 30px; background-color: green; color: white; margin: 20px; text-align: center; cursor: pointer;" onclick="startStop(1)">
GO
</div>
<div style="width: 100px; height: 30px; background-color: red; color: white; margin: 20px; text-align: center; cursor: pointer;" onclick="startStop(0)">
STOP
</div>
<!-- ELEMENT TO ROTATE INFINITLY WITH "spin" CLASS -->
<div id="imSpinning" class="spin" style="position: absolute; top: 10px; right: 30px; height: 140px; width: 140px; background-image: url(https://icons.iconarchive.com/icons/thehoth/seo/256/seo-web-code-icon.png); background-size: 100% 100%; background-position: center center; border-radius: 50%; overflow: hidden;"></div>
<!-- ELEMENT TO ROTATE ONCE WITH "spin" CLASS -->
<div id="imSpinningOnce" class="spinOnce" style="position: absolute; top: 10px; right: 200px; height: 140px; width: 140px; background-image: url(https://icons.iconarchive.com/icons/thehoth/seo/256/seo-web-code-icon.png); background-size: 100% 100%; background-position: center center; border-radius: 50%; overflow: hidden;"></div>
Simply copy the CSS class above to the style section/sheet of your page and modify it as needed. Ensure you reference the class in your html element.
Also I edited in a small JavaScript class that add/removes the spin class from the DIV element if it helps you in starting and stopping the animation.
Hope this helps, and best of luck!

Bug animation in translate with percentage on Safari/iOS adding via JavaScript

I think I found a bug related with percentages on Safari in the animations. I would like to know if really it is a bug or a Safari custom.
Explanation of the bug:
On Safari or iOS when you start an animation with a translate with percentages, the position is wrong and the animation is shown in another place.
In the next example, the square should not move because the transform is the same and it should start with a 10% 10% "margin" of its size. The bug occurs when it is adding via JavaScript after some time (like 500 ms).
If you see the bug, you will see a jump from 0 0 to 10% 10% in Safari and iOS.
var div = document.createElement('div');
setTimeout( function(){
document.body.appendChild(div);
}, 500);
div {
background: red;
width: 200px;
height: 200px;
-webkit-transform: translate(10%, 10%);
-webkit-animation: 1s bugAnimation;
}
#-webkit-keyframes bugAnimation {
from {
-webkit-transform: translate(10%, 10%);
background: blue; /* To see the animation */
}
to {
-webkit-transform: translate(10%, 10%);
background: red; /* To see the animation */
}
}
Possible solutions:
Changing the percentage values by viewport units or another.
Obviously that options is not valid for all cases because I need the percentage but it could be a small solution for now if I know the size of the div (vw, vh, px...).
Do somebody know this bug?
Tested on Safari 10.1.1 and iOS 9.3.1 (with webview).
EDIT:
Really I need the translate2D because I am rotating a DIV in the center of the page and the size is unknown, an example:
var div = document.createElement('div');
setTimeout( function(){
document.body.appendChild(div);
}, 500);
div {
background: red;
width: 200px;
height: 200px;
position: fixed;
top: 50%;
left: 50%;
-webkit-transform: translate(-50%, -50%);
-webkit-animation: 1s bugAnimation;
-webkit-transform-origin: center center;
}
#-webkit-keyframes bugAnimation {
from {
-webkit-transform: rotate(0deg) translate(-50%, -50%);
}
to {
-webkit-transform: rotate(360deg) translate(-50%, -50%);
}
}

Ok, a workaround maybe using em instead of %
var div = document.createElement('div');
setTimeout( function(){
document.body.appendChild(div);
}, 500);
div {
background: red;
width: 200px;
height: 200px;
-webkit-animation: 1s bugAnimation forwards;
}
#-webkit-keyframes bugAnimation {
from {
-webkit-transform: translate(0, 0);
background: blue; /* To see the animation */
}
to {
-webkit-transform: translate(1.3em, 1.3em);
background: red; /* To see the animation */
}
}
Ok, please take another look at that approach. I wondered why you are using keyframed animation. Maybe the example is not representative but in this case you can just animate with a simple transition. Please take another look here:
setTimeout(function() {
document.getElementById("div").classList.add("animated");
}, 1000);
div {
background: red;
width: 200px;
height: 200px;
position: absolute;
top: 50%;
left: 50%;
-webkit-transition: transform 1s;
-moz-transition: transform 1s;
-ms-transition: transform 1s;
-o-transition: transform 1s;
transition: transform 1s;
}
.animated {
transform: translate(-50%, -50%) rotate(360deg);
}
<div id="div"></div>

Looks like a Mac Safari issue,
I removed -webkit-transform property from keyframes which fixes the jumping problem on Safari and also works fine on Chrome too. Try this code,
var div = document.createElement('div');
setTimeout( function(){
document.body.appendChild(div);
}, 500);
div {
background: red;
width: 200px;
height: 200px;
-webkit-transform: translate(10%, 10%);
-webkit-animation: 1s bugAnimation;
}
#-webkit-keyframes bugAnimation {
from {
background: blue; /* To see the animation */
}
to {
background: red; /* To see the animation */
}
}

CSS Animation Fill Mode - What have I done wrong?

I need to create a rotation animation. A click event spins an element 180° to point down. Another click event spins the same element back to 0° to point up.
I have animation-fill-mode to set to forwards to preserve the last keyframe state. But it does not appear to be working. All visual elements reset to the default state.
Any ideas what I may be doing wrong?
My Codepen: http://codepen.io/simspace-dev/pen/RrpGmP
My code:
(function() {
$('#btnb').on('click', function(e) {
return $('.box').addClass('spin-counter-clockwise');
});
$('#btnf').on('click', function(e) {
return $('.box').addClass('spin-clockwise');
});
$('.box').on('webkitAnimationEnd', function(e) {
return $(e.target).removeClass('spin-counter-clockwise').removeClass('spin-clockwise');
});
}.call(this));
.box {
background: red;
position: relative;
width: 176px;
height: 176px;
margin: 40px auto;
text-align: center;
}
.box .top {
background: green;
position: absolute;
top: 0;
width: 100%;
height: 28px;
}
.box .bottom {
background: purple;
position: absolute;
bottom: 0;
width: 100%;
height: 28px;
}
.box .caret {
color: white;
font-size: 88px;
position: absolute;
top: 42px;
left: 50px;
}
.spin-clockwise {
-moz-animation: spin 2s;
-webkit-animation: spin 2s;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
.spin-counter-clockwise {
-moz-animation: spin 2s reverse;
-webkit-animation: spin 2s reverse;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
#keyframes spin {
from {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-webkit-transform: rotate(180deg);
transform: rotate(180deg);
}
}
body {
text-align: center;
margin: 0 auto;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>Keyframes are not supported in IE9 and earlier</h2>
<div class="box">
<div class="top">top</div>
<div class="caret"><i class="fa fa-caret-square-o-up"></i>
</div>
<div class="bottom">bottom</div>
</div>
<p>
<button id="btnf">SPIN CLOCKWISE</button>
</p>
<p>
<button id="btnb">SPIN COUTNER CLOCKWISE</button>
</p>

TL;DR: (straight to the suggested solution)
If all you need is a rotation from 0° to 180° on the click of one button and back from 180° to 0° on the other then I would suggest using transitions instead of animations. Transitions by default produce the reverse effect and so there is no need to code for two different states (which makes it even better).
(function() {
$('#btnb').on('click', function(e) {
return $('.box').removeClass('spin');
});
$('#btnf').on('click', function(e) {
return $('.box').addClass('spin');
});
}.call(this));
.box {
background: red;
position: relative;
width: 176px;
height: 176px;
margin: 40px auto;
text-align: center;
transition: transform 1s linear;
/* add this to enable transition */
}
.box .top {
background: green;
position: absolute;
top: 0;
width: 100%;
height: 28px;
}
.box .bottom {
background: purple;
position: absolute;
bottom: 0;
width: 100%;
height: 28px;
}
.box .caret {
color: white;
font-size: 88px;
position: absolute;
top: 42px;
left: 50px;
}
.spin {
/* this is the only thing required for rotation (along with the JS) */
transform: rotate(180deg);
}
body {
text-align: center;
margin: 0 auto;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>Keyframes are not supported in IE9 and earlier</h2>
<div class="box">
<div class="top">top</div>
<div class="caret"><i class="fa fa-caret-square-o-up"></i>
</div>
<div class="bottom">bottom</div>
</div>
<p>
<button id="btnf">SPIN CLOCKWISE</button>
</p>
<p>
<button id="btnb">SPIN COUTNER CLOCKWISE</button>
</p>
If you were using animations only for learning purpose, the details provided below should still be useful to you in terms of understanding how animations work, what are the limitations because of it etc.
Chris' answer touches upon the reason for your problem but I thought the question merited a bit more detailed explanation of two things - (1) Why the element doesn't hold the state as at the last keyframe even though animation-fill-mode: forwards setting is applied (2) Why the same keyframe couldn't be used for the reverse animation (when the class with the original animation was not removed). I also wanted to suggest a different alternate to the whole thing and hence the separate answer.
Why does the element not hold the state as at the last keyframe even though fill mode is set to forwards?
This is because you are removing the class that adds the animation as soon as animation completes (inside the on('webkitAnimationEnd') event handler). Generally when animation-fill-mode is set to forwards, the UA uses the settings (or property-value pair) that are provided within last keyframe to maintain the state. But once the class is removed (and in-turn the animation settings), the UA does not keep track of (or know what) animations that were prior present on the element, their state and fill mode etc. Once animation is removed, the browser triggers a repaint and this will be performed based on classes that are present on the element as at the time of the repaint. Due to this, the element would snap back to its un-rotated state. You can read more about it in my answer here to a similar question (but not the same :)).
Why can't the same keyframe be used for the reverse animation (when the class which had the original animation was not removed)?
This again is because of how animations generally work. When any animation is added to an element, the UA maintains details about the animation's keyframes, its state etc as long as it is attached to the element. So, unless the class which added the forward (0° to 180°) animation is removed, the browser thinks that it has executed the animation to completion (as default iteration count is just 1) and so even when a class with the reverse animation is added, it does nothing. The only way to make it restart the animation in reverse direction is by removing the class with the forward animation and then adding the class with the reverse animation. You can have a look at this answer also for related reading.
Because of the aforementioned reasons, the only way to achieve what you need with animations is to create two different animations (or keyframes) for the forward and reverse animations, set them under two different classes and keep changing the classes using JavaScript. This whole process becomes tedious and is generally not necessary when all you need is a rotation from (0° to 180°) on the click of one button and back from (180° to 0°) on the other. This whole thing can be achieved using transitions and what makes this even better is the fact that transitions by default produce the reverse effect and so there is no need to code for two different states.
Further Reading:
What are the differences between Transitions and Animations
Choosing Transitions or Animations - When to use which?
If the need is to have continuous clockwise or counter-clockwise rotations with each button click (like in oMiKeY's answer) then I'd still recommend using transition with a bit of JS like in the below snippet. Let's leave animations for more complex stuff (and in specific stuff that'd happen without any triggers).
(function() {
var deg = 0;
$('#btnb').on('click', function(e) {
deg -= 180;
return $('.box').css('transform', 'rotate(' + deg + 'deg)');
});
$('#btnf').on('click', function(e) {
deg += 180;
return $('.box').css('transform', 'rotate(' + deg + 'deg)');
});
}.call(this));
.box {
background: red;
position: relative;
width: 176px;
height: 176px;
margin: 40px auto;
text-align: center;
transition: transform 1s linear; /* add this to enable transition */
}
.box .top {
background: green;
position: absolute;
top: 0;
width: 100%;
height: 28px;
}
.box .bottom {
background: purple;
position: absolute;
bottom: 0;
width: 100%;
height: 28px;
}
.box .caret {
color: white;
font-size: 88px;
position: absolute;
top: 42px;
left: 50px;
}
body {
text-align: center;
margin: 0 auto;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<h2>Keyframes are not supported in IE9 and earlier</h2>
<div class="box">
<div class="top">top</div>
<div class="caret"><i class="fa fa-caret-square-o-up"></i>
</div>
<div class="bottom">bottom</div>
</div>
<p>
<button id="btnf">SPIN CLOCKWISE</button>
</p>
<p>
<button id="btnb">SPIN COUTNER CLOCKWISE</button>
</p>

So the root issue was the class with the animation was being removed.
I couldn't get it to work using the same keyframes, but what i did was create a new keyframes for counter clockwise, and then removed the opposite class when the buttons were clicked
Changes:
css
.spin-clockwise {
-moz-animation: spin 2s;
-webkit-animation: spin 2s;
}
.spin-fill-mode {
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
animation-fill-mode: forwards;
}
.spin-counter-clockwise {
-moz-animation: spin-counter 2s;
-webkit-animation: spin-counter 2s;
}
#keyframes spin {
from {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-webkit-transform: rotate(180deg);
transform: rotate(180deg);
}
}
#keyframes spin-counter {
from {
-webkit-transform: rotate(180deg);
transform: rotate(180deg);
}
to {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
}
js:
$('#btnb').on('click', (e)->
$('.box')
.addClass('spin-counter-clockwise')
.removeClass('spin-clockwise')
)
$('#btnf').on('click', (e) ->
$('.box')
.addClass('spin-clockwise')
.removeClass('spin-counter-clockwise')
)
And add the class spin-fill-mode to box. Though you could probably just leave the fill-mode in the animation classes...
updated codepen:
http://codepen.io/anon/pen/QypvOr

I fiddled with it for a while then decided you might need two separate rotation animations.
Check out my fiddle: http://codepen.io/anon/pen/jWBmZK
(function() {
$('#btnb').on('click', function(e) {
return $('.box')
.addClass('spin-counter-clockwise')
.toggleClass('upside-down');
});
$('#btnf').on('click', function(e) {
return $('.box')
.addClass('spin-clockwise')
.toggleClass('upside-down');
});
$('.box').on('webkitAnimationEnd', function(e) {
return $(e.target).removeClass('spin-counter-clockwise').removeClass('spin-clockwise');
});
}.call(this));
.box {
background: red;
position: relative;
width: 176px;
height: 176px;
margin: 40px auto;
text-align: center;
}
.box .top {
background: green;
position: absolute;
top: 0;
width: 100%;
height: 28px;
}
.box .bottom {
background: purple;
position: absolute;
bottom: 0;
width: 100%;
height: 28px;
}
.box .caret {
color: white;
font-size: 88px;
position: absolute;
top: 42px;
left: 50px;
}
.upside-down {
-moz-transform: rotate(180deg);
-webkit-transform: rotate(180deg);
-ms-transform: rotate(180deg);
-o-transform: rotate(180deg);
transform: rotate(180deg);
}
.spin-clockwise.upside-down {
-moz-animation: spin 2s;
-webkit-animation: spin 2s;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
.spin-counter-clockwise {
-moz-animation: spin 2s reverse;
-webkit-animation: spin 2s reverse;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
.spin-clockwise {
-moz-animation: back-spin 2s;
-webkit-animation: back-spin 2s;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
.spin-counter-clockwise.upside-down {
-moz-animation: back-spin 2s reverse;
-webkit-animation: back-spin 2s reverse;
-moz-animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
#keyframes spin {
from {
-webkit-transform: rotate(0deg);
transform: rotate(0deg);
}
to {
-webkit-transform: rotate(180deg);
transform: rotate(180deg);
}
}
#keyframes back-spin {
from {
-webkit-transform: rotate(180deg);
transform: rotate(180deg);
}
to {
-webkit-transform: rotate(360deg);
transform: rotate(360deg);
}
}
body {
text-align: center;
margin: 0 auto;
}
<link href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<html>
<body>
<h2>Keyframes are not supported in IE9 and earlier</h2>
<div class="box">
<div class="top">top</div>
<div class="caret"><i class="fa fa-caret-square-o-up"></i>
</div>
<div class="bottom">bottom</div>
</div>
<p>
<button id="btnf">SPIN CLOCKWISE</button>
</p>
<p>
<button id="btnb">SPIN COUTNER CLOCKWISE</button>
</p>
</body>
</html>

Closeable bottom bar with slide animation

I want a bar for the bottom of my webpage that has a nice animation, similar to this one: http://css-tricks.com/pop-from-top-notification/ but stays on screen until it is closed. This is all the css I have so far:
.about {
background: black;
text-align: left;
position: fixed;
z-index: 100;
bottom: 0;
left: 0;
width: 100%;
color: #0f0;
font-size: 21px;
font-family: Timeburner;
padding: 10px;
}
I don't care if it takes jquery or somthing else, as long as it works.

you need to add this css:
#-webkit-keyframes slideUp {
0% { -webkit-transform: translateY(50px); }
100% { -webkit-transform: translateY(0px); }
}
#-moz-keyframes slideUp {
0% { -moz-transform: translateY(50px); }
100% { -moz-transform: translateY(0px); }
}
#note {
-webkit-transform: translateY(-50px);
-webkit-animation: slideUp 2.5s 1.0s 1 ease forwards;
-moz-transform: translateY(-50px);
-moz-animation: slideUp 2.5s 1.0s 1 ease forwards;
}
here is the Fiddle Demo
here is your example with the Css animation: Fiddle (you will need to add the JS for the close button)
here is and example with slide down on close: Fiddle it uses Jquery but can also be done using pure JS:
close = document.getElementById("close");
close.addEventListener('click', function() {
$("#note").slideUp();
}, false);

get #keyframe current value in css3 with javascript

See the demo here:
http://jsfiddle.net/hamidrezabstn/fgcPa/5/
When I click on the middle raindrop , I would like it to rotate to the current position of the spinning circle! I tried below the JS code but it doesn't work! The next thing I want to do is the raindrop rotate with spining circle!
$(function() {
$('#center').click(function() {
var pos = $('#circle').css('transform')
$(this).css('transform', 'pos')
});
});

$(function() {
$('#center').click(function() {
var obj, matrix;
obj = document.getElementById('circle');
matrix = getComputedStyle(obj).getPropertyValue('transform');
console.log(matrix);
//$(this).css('transform', matrix)
});
});
read more here http://dev.opera.com/articles/view/understanding-3d-transforms/

EDITED: I said that it is not posible to get the current status of the transform in an animation, but I was wrong. Sorry about that !
To do what you want, any way, you don't need really to get it; just use it.
I have changed slightly your HTML to put the raindrop inside the rotating div.
Then, with this CSS:
.raindrop {
background:center blue;
width:50px;
height:50px;
border-radius: 100%;
border-top-left-radius: 0;
position: absolute;
margin: auto;
left: 75px;
top: 75px;
animation: ccircle 5s infinite linear;
-webkit-animation: ccircle 5s infinite linear;
}
.raindrop:hover {
animation: none;
-webkit-animation: none;
}
.axis {
width: 200px;
height: 200px;
transform: scaleX(2);
background-color: none;
border: 1px solid black;
left: 50px;
position: absolute;
top: 50px;
border-radius: 50%;
}
.rotate {
width: 100%;
height: 100%;
top: 0px;
animation: circle 5s infinite linear;
-webkit-animation: circle 5s infinite linear;
transform-origin: 50% 50%;
-webkit-transform-origin: 50% 50%;
position: absolute;
}
.counterrotate {
width: 50px;
height: 50px;
animation: ccircle 5s infinite linear;
-webkit-animation: ccircle 5s infinite linear;
}
.planet {
width: 50px;
height: 50px;
position: absolute;
border-radius : 50px;
left: 0px;
top: 0px;
background-color: red;
display: block;
}
#keyframes circle {
from { transform: rotateZ(0deg) }
to { transform: rotateZ(360deg) }
}
#-webkit-keyframes circle {
0% { -webkit-transform: rotateZ(0deg) }
100% { -webkit-transform: rotateZ(360deg) }
}
#keyframes ccircle {
from { transform: rotateZ(360deg) }
to { transform: rotateZ(0deg) }
}
#-webkit-keyframes ccircle {
from { -webkit-transform: rotateZ(360deg) }
to { -webkit-transform: rotateZ(0deg) }
}
You got this fiddle
In it, the raindrop is always rotating with the axis div. But it is also counter-rotating, so it appears to be static.
When you hover it, the count-rotation is disabled, and it points to red circle. And will continue to do so as long as you hover it.
To do that thru a click, just asociate the :hover properties to a class, and set this class in the click.