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How to change how fast an element spins in CSS

So the element That I am manipulating has an id of spinning and a class of rotors
I can get my element to spin. I did this by using the css code here:
.rotors {
position: relative;
top: 90px;
left: 30px;
-webkit-animation:spin .5s linear infinite;
-moz-animation:spin .5s linear infinite;
animation:spin .5s 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);}}
But Say instead of it spinning automatically on the page load that I could press a button with an id of one and it would start to spin, and if I press a second button with an id of two, it would spin even faster then the first.
I am not sure how to achieve this. I did see where some people pointed out that you can change the css of an element using javascript but am unsure on how to achieve this especially on a button click. I want it to be something like getElementById(spinning).style.property = but on button click and just changing the speed of the rotation of my element.

One option would be to change the animation-duration CSS property dynamically with JavaScript.
var rotors = document.querySelector(".rotors");
function fast() {
rotors.style.animationDuration = ".2s";
}
function slow() {
rotors.style.animationDuration = ".5s";
}
.rotors {
height: 50px; /* for demo purpose */
width: 50px; /* for demo purpose */
animation: spin .5s linear infinite;
}
#keyframes spin {
100% { transform: rotate(360deg); }
}
<p>
<button onclick="fast()">Fast</button>
<button onclick="slow()">Slow</button>
</p>
<img class="rotors" src="https://cdn.onlinewebfonts.com/svg/img_489361.png" />

Add 2 buttons and use it to change the classes like below:
function startSpinning(){
var spDiv = document.getElementById('test');
if(spDiv.classList.contains('rotorsFast')){
spDiv.classList.remove('rotorsFast');
spDiv.classList.add('rotors');
}else{
spDiv.classList.add('rotors');
}
}
function startSpinningFast(){
var spDiv = document.getElementById('test');
if(spDiv.classList.contains('rotors')){
spDiv.classList.remove('rotors');
spDiv.classList.add('rotorsFast');
}else{
spDiv.classList.add('rotorsFast');
}
}
.rotors {
position: relative;
top: 90px;
left: 30px;
-webkit-animation: spin .5s linear infinite;
-moz-animation: spin .5s linear infinite;
animation: spin .5s linear infinite;
}
.rotorsFast {
position: relative;
top: 90px;
left: 30px;
-webkit-animation: spin .2s linear infinite;
-moz-animation: spin .2s linear infinite;
animation: spin .2s 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);
}
}
<div id="test" style="width:20px">apple</div>
<button onclick="startSpinning()">spin</button>
<button onclick="startSpinningFast()">spin Fast</button>

This is a nice spot to use a CSS custom variable. When the button is clicked, we toggle a secondary class on the .rotors div. When the faster class is present, the custom variable resets the animation speed to the faster speed, which is automatically applied to the animation.
const rotors = document.querySelector('.rotors');
const btn = document.querySelector('.rotorButton');
btn.addEventListener('click', () => {
rotors.classList.toggle('faster')
});
.rotors {
--spin-speed: 2s; /* Initial speed */
position: relative;
top: 40px;
left: 30px;
background-color: yellow;
color: black;
display: inline-block;
animation: spin var(--spin-speed) linear infinite;
}
.rotors.faster {
--spin-speed: .5s; /* Faster speed 🔥 */
}
#keyframes spin {
100% {
transform: rotate(360deg);
}
}
<div class="rotors">text</div>
<button class="rotorButton" type="button">Toggle Rotor Speed</button>
jsFiddle

Changing max-height back to zero as transition or animation

So I have got an animation on an object (<div>).
#keyframes fade-in-left {
0% {
max-height: 0px;
}
100% {
max-height: 200px;
}
This animation obviously happens when the object is being created. What I need now is an animation or transition that shrinks my object back down to max-height: 0px;.
Giving the property max-height an transition and then changing the value of it in js to 0px does nothing.
Also creating a reversed animation and then repolacing the original
object with a clone and this animation does not bring the object down
to 0px.
(Please keep in mind that I am not intersted in changing the scale or other transform properties)
Thanks for your suggestions!
More details:
My <div> object:
#keyframes fade-in-left {
0% {
max-height: 0px;
}
100% {
max-height: 200px;
}
}
.law-list .law-item {
-webkit-transition: max-height .9s linear;
-moz-transition: max-height .9s linear;
-ms-transition: max-height .9s linear;
-o-transition: max-height .9s linear;
transition: max-height .9s linear;
}
.fade-in {
-webkit-animation-duration: .9s;
animation-duration: .9s;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation-name: fade-in-left;
animation-name: fade-in-left;
}
I create my html content in js and the html elements looks like this:
<div class='law-item fade-in' id='law_0'>Law Nr.1</div>
<div class='law-item fade-in' id='law_1'>Law Nr.2</div>
So when an element is created, the max-height animation plays.
When I want to delete an object, I want the situation stated above to occur: a fade out animation and then an deletion.
I handel his in a js function:
function removeLaw(id) {
document.getElementById("law_" + id).style.maxHeight = "0px";
setTimeout(function() {
document.getElementById("law_" + id).parentElement.removeChild(document.getElementById("law_" + id));
}, 900);
}
As stated it should fade out to 0 max-height. But all it does it stay at the current max-height and then after max-height get deleted.

There is always more than one way to do something. Since you are using an animation to set the height, it is best to use an animation to remove the height as well. Think of the animation ending at 100%. At this point, your max-height is set. Even though you have a transition set on the element, the animation is preventing the transition from firing as it should. The animation event is still firing even though it is at 100%. You could set an event listener on the animationend event from the beginning and pause the animation. I haven't tried this, but it may work.
What I found in your case is to create a fade-out class and a fade-out animation. I removed all references to transition from your css since I used animations. I suppose you could go the other way and use only transitions instead of animations, but mixing them is the problem you have been having.
I created a basic click event listener on each law-item and changed the class on the item prior to removing when the new animation ended.
function removeLaw(id) {
var el = document.getElementById(id);
el.classList.remove('fade-in');
el.classList.add('fade-out');
el.addEventListener('animationend', function(e) {
el.remove();
})
}
var lawItems = document.querySelectorAll('.law-item');
lawItems.forEach(function(lawItem){
this.addEventListener('click', function(e) {
removeLaw(e.target.id)
})
})
#keyframes fade-in-left {
0% {
max-height: 0px;
}
100% {
max-height: 200px;
}
}
#keyframes fade-out-left {
0% {
max-height: 200px;
}
100% {
max-height: 0px;
}
}
.law-list .law-item {
height: 200px;
}
.fade-in {
-webkit-animation-duration: 900ms;
animation-duration: 900ms;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation-name: fade-in-left;
animation-name: fade-in-left;
}
.fade-out {
-webkit-animation-duration: 900ms;
animation-duration: 900ms;
-webkit-animation-fill-mode: both;
animation-fill-mode: both;
-webkit-animation-name: fade-out-left;
animation-name: fade-out-left;
}
<div class='law-list'>
<div class='law-item fade-in' id='law_0'>Law Nr.1</div>
<div class='law-item fade-in' id='law_1'>Law Nr.2</div>
</div>

Fade In and Out on Button Click

The CSS styling for this fade in and out animation seems fine, but it is not reusable with javascript. Once the function performs once, it can not be triggered by button onClick again, what is the way around this?
//removeClass
//addClass
.elementToFadeInAndOut {
width:200px;
height: 200px;
background: red;
-webkit-animation: fadeinout 4s linear forwards;
animation: fadeinout 4s linear forwards;
opacity: 0;
}
#-webkit-keyframes fadeinout {
50% { opacity: 1; }
}
#keyframes fadeinout {
50% { opacity: 1; }
}
<button onClick="animationfunction()">Button</button>
<div id="icon" class="elementToFadeInAndOut"></div>

You only need to have the button click add the class membership, wait until the animation is complete and then remove the class.
var div = document.querySelector(".fade");
var btn = document.querySelector(".fadeButton");
btn.addEventListener("click", function(){
div.classList.add("elementToFadeInAndOut");
// Wait until the animation is over and then remove the class, so that
// the next click can re-add it.
setTimeout(function(){div.classList.remove("elementToFadeInAndOut");}, 4000);
});
.fade{
width:200px;
height: 200px;
background: red;
opacity:0;
}
.elementToFadeInAndOut {
animation: fadeInOut 4s linear forwards;
}
#keyframes fadeInOut {
0% { opacity:0; }
50% { opacity:1; }
100% { opacity:0; }
}
<button class="fadeButton">Button</button>
<div class="fade"></div>

The best way is to use jQuery for functions
here is the code for fade in and out effect for toggle button.
you can adjust the time by changing that (1000) in jQuery Thank you
$(document).ready(function(){
$('button.btn').click(function(){
$("div.elementToFadeInAndOut").fadeOut(1000);
$("div.elementToFadeInAndOut").fadeIn(1000);
});
});
.elementToFadeInAndOut {
width:200px;
height: 200px;
background: red;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<button class="btn">Button</button>
<div class="elementToFadeInAndOut"></div>

Repeat animation every 3 seconds

I am using WOW.js and animate.css, right now I am running my CSS to Infinite. I would like know how can I make my class run for 3 seconds stop and start again to infinite?
My html:
<img src="images/fork.png" class="fork wow rubberBand" >
My CSS class:
.fork {
position: absolute;
top: 38%;
left: 81%;
max-width: 110px;
-webkit-animation-iteration-count: infinite ;
-webkit-animation-delay: 5s;
}
The solution can be in JS or CSS3.

With pure CSS3 animations, one way to add a delay between every single iteration of the animation would be to modify the keyframes setting such that they produce the required delay.
In the below snippet, the following is what is being done:
The whole duration of the animation is 6 seconds. In order to have the delay, the whole duration should be the duration for which your animation actually runs + time delay. Here, the animation actually runs for 3s, we need a 3s delay and so the duration is set as 6 seconds.
For the first 50% of the animation (that is, 3 seconds), nothing happens and the element basically holds its position. This gives the appearance of the 3 second delay being applied
For the next 25% of the animation (that is, 1.5 seconds) the element moves down by 50px using transform: translateY(50px).
For the final 25% of the animation (that is, last 1.5 seconds) the element moves up by 50px using transform: translate(0px) (back to its original position).
The whole animation is repeated infinite number of times and each iteration will end up having a 3 second delay.
div{
height: 100px;
width: 100px;
border: 1px solid;
animation: move 6s infinite forwards;
}
#keyframes move{
0% { transform: translateY(0px);}
50% { transform: translateY(0px);}
75% { transform: translateY(50px);}
100% { transform: translateY(0px);}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>
<div>Some content</div>
The animation-delay property introduces a delay only for the first iteration and hence it cannot be used to add delays between every iteration. Below is a sample snippet illustrating this.
div{
height: 100px;
width: 100px;
border: 1px solid;
animation: move 6s infinite forwards;
animation-delay: 3s;
}
#keyframes move{
0% { transform: translateY(0px);}
50% { transform: translateY(50px);}
100% { transform: translateY(0px);}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/prefixfree/1.0.7/prefixfree.min.js"></script>
<div>Some content</div>

LIke this
html
<div class="halo halo-robford-animate"></div>
css
body{
background: black;
}
.halo{
width: 263px;
height: 77px;
background: url('http://i.imgur.com/3M05lmj.png');
}
.halo-robford-animate{
animation: leaves 0.3s ease-in-out 3s infinite alternate;
-webkit-animation: leaves 0.3s ease-in-out 3s infinite alternate;
-moz-animation: leaves 0.3s ease-in-out 3s infinite alternate;
-o-animation: leaves 0.3s ease-in-out 3s infinite alternate;
}
#-webkit-keyframes leaves {
0% {
opacity: 1;
}
50% {
opacity: 0.5;
}
100% {
opacity: 1;
}
}
#-moz-keyframes leaves {
0% {
opacity: 1;
}
50% {
opacity: 0.5;
}
100% {
opacity: 1;
}
}
#-o-keyframes leaves {
0% {
opacity: 1;
}
50% {
opacity: 0.5;
}
100% {
opacity: 1;
}
}
#keyframes leaves {
0% {
opacity: 1;
}
50% {
opacity: 0.5
}
100% {
opacity: 1;
}
}
jsfiddle

CSS3 Keyframe Animations: End and stay on the last frame

I've run into some difficulty trying to play a CSS3 keyframe animation and have the relevant element stick at the last frame after the animation has completed. To my understanding, the property that I have to set for this to work should be animation-fill-mode, which should have the value of forwards; this doesn't do anything.
.animatedSprite {
.animation-name: sprite;
.animation-duration: .5s;
.animation-iteration-count: 1;
.animation-direction: normal;
.animation-timing-function: steps(3);
.animation-fill-mode: forwards;
//Vendor prefixes... }
This will just play the animation once and then go back to the first frame. I found an example of keyframe animations at JSFiddle ( http://jsfiddle.net/simurai/CGmCe/ ), and changing the fill mode to forwards and setting the iteration count to 1 wouldn't do anything there, either.
Any help would be greatly appreciated.

animation-fill-mode:forwards is the correct property to use. Is does not seem to work because the sprite image background has a default background-repeat:repeat, so the last frame you think you are seeing is actually the first frame of the repeated background image.
If you set
background: url("http://files.simurai.com/misc/sprite.png") no-repeat
animation: play .8s steps(10) forwards;
#keyframes play {
from { background-position: 0px; }
to { background-position: -500px; }
}
and run the demo the final frame is now blank - so forwards is doing what it should do. The second part of the solution is to change the final to and steps CSS properties to position the background correctly. So we really need the background to stop at -450px and use 9 steps.
-webkit-animation: play .8s steps(9) forwards;
#keyframes play {
from { background-position: 0; }
to { background-position: -450px; }
}
See demo - I only fixed the Chrome properties. Also here is the sample image in case the original disappears.
.hi {
width: 50px;
height: 72px;
background: url("http://i.stack.imgur.com/ilKfd.png") no-repeat;
-webkit-animation: play .8s steps(9) forwards;
-moz-animation: play .8s steps(10) infinite;
-ms-animation: play .8s steps(10) infinite;
-o-animation: play .8s steps(10) infinite;
animation: play .8s steps(9) forwards;
}
#-webkit-keyframes play {
from { background-position: 0px; }
to { background-position: -450px; }
}
#-moz-keyframes play {
from { background-position: 0px; }
to { background-position: -500px; }
}
#-ms-keyframes play {
from { background-position: 0px; }
to { background-position: -500px; }
}
#-o-keyframes play {
from { background-position: 0px; }
to { background-position: -500px; }
}
#keyframes play {
from { background-position: 0px; }
to { background-position: -450px; }
}
<div class="hi"></div>

Change 'infinite' to '1' in the css, this fixes it for me

just add
animation: mymove .8s forwards;
here 'mymove' is name of my keyframe
example:
<html>
<head>
<style>
div {
width: 100px;
height: 100px;
background: red;
position: relative;
animation: mymove .8s forwards;
}
#keyframes mymove {
from {top: 0px;}
to {top: 200px;}
}
</style>
</head>
<body>
<h1>The #keyframes Rule</h1>
<div></div>
</body>
</html>

The following code will make the transition stay on the last frame:
-webkit-timing-function:ease;
-webkit-iteration-count:1;