I have a CSS3 animation that needs to be restarted on a click. It's a bar showing how much time is left. I'm using the scaleY(0) transform to create the effect.
Now I need to restart the animation by restoring the bar to scaleY(1) and let it go to scaleY(0) again.
My first attempt to set scaleY(1) failed because it takes the same 15 seconds to bring it back to full length. Even if I change the duration to 0.1 second, I would need to delay or chain the assignment of scaleY(0) to let the bar replenishment complete.
It feels too complicated for such a simple task.
I also found an interesting tip to restart the animation by removing the element from the document, and then re-inserting a clone of it:
http://css-tricks.com/restart-css-animation/
It works, but is there a better way to restart a CSS animation?
I'm using Prototype and Move.js, but I'm not restricted to them.
No need in timeout, use reflow to apply the change:
function reset_animation() {
var el = document.getElementById('animated');
el.style.animation = 'none';
el.offsetHeight; /* trigger reflow */
el.style.animation = null;
}
#animated {
position: absolute;
width: 50px; height: 50px;
background-color: black;
animation: bounce 3s ease-in-out infinite;
}
#keyframes bounce {
0% { left: 0; }
50% { left: calc( 100% - 50px ); }
100% { left: 0; }
}
<div id="animated"></div>
<button onclick="reset_animation()">Reset</button>
Just set the animation property via JavaScript to "none" and then set a timeout that changes the property to "", so it inherits from the CSS again.
Demo for Webkit here: http://jsfiddle.net/leaverou/xK6sa/
However, keep in mind that in real world usage, you should also include -moz- (at least).
#ZachB's answer about the Web Animation API seems like "right"™ way to do this, but unfortunately seems to require that you define your animations through JavaScript. However it caught my eye and I found something related that's useful:
Element.getAnimations() and Document.getAnimations()
The support for them is pretty good as of 2021.
In my case, I wanted to restart all the animations on the page at the same time, so all I had to do was this:
const replayAnimations = () => {
document.getAnimations().forEach((anim) => {
anim.cancel();
anim.play();
});
};
But in most cases people will probably want to select which animation they restart...
getAnimations returns a bunch of CSSAnimation and CSSTransition objects that look like this:
animationName: "fade"
currentTime: 1500
effect: KeyframeEffect
composite: "replace"
pseudoElement: null
target: path.line.yellow
finished: Promise {<fulfilled>: CSSAnimation}
playState: "finished"
ready: Promise {<fulfilled>: CSSAnimation}
replaceState: "active"
timeline: DocumentTimeline {currentTime: 135640.502}
# ...etc
So you could use the animationName and target properties to select just the animations you want (albeit a little circuitously).
EDIT
Here's a handy function that might be more compatible using just Document.getAnimations, with TypeScript thrown in for demonstration/fun:
// restart animations on a given dom element
const restartAnimations = (element: Element): void => {
for (const animation of document.getAnimations()) {
if (element.contains((animation.effect as KeyframeEffect).target)) {
animation.cancel();
animation.play();
}
}
};
Implement the animation as a CSS descriptor
Add the descriptor to an element to start the animation
Use a animationend event handler function to remove the descriptor when the animation completes so that it will be ready to be added again next time you want to restart the animation.
HTML
<div id="animatedText">
Animation happens here
</div>
<script>
function startanimation(element) {
element.classList.add("animateDescriptor");
element.addEventListener( "animationend", function() {
element.classList.remove("animateDescriptor");
} );
}
</script>
<button onclick="startanimation(
document.getElementById('animatedText') )">
Click to animate above text
</button>
CSS
#keyframes fadeinout {
from { color: #000000; }
25% {color: #0000FF; }
50% {color: #00FF00; }
75% {color: #FF0000; }
to { color : #000000; }
}
.animateDescriptor {
animation: fadeinout 1.0s;
}
Try it here: jsfiddle
If you have a class for CSS3 animation, for example .blink, then you can removeClass for some element and addClass for this element thought setTimeout with 1 millisecond by click.
$("#element").click(function(){
$(this).removeClass("blink");
setTimeout(function(){
$(this).addClass("blink);
},1 // it may be only 1 millisecond, but it's enough
});
You can also use display property, just set the display to none.
display:none;
and the change backs it to block (or any other property you want).
display:block;
using JavaScript.
and it will work amazingly.
The Animation API gives you full control over when and what to play, and is supported by all modern browsers (Safari 12.1+, Chrome 44+, Firefox 48+, Edge 79+) .
const effect = new KeyframeEffect(
el, // Element to animate
[ // Keyframes
{transform: "translateY(0%)"},
{transform: "translateY(100%)"}
],
{duration: 3000, direction: "alternate", easing: "linear"} // Keyframe settings
);
const animation = new Animation(effect, document.timeline);
animation.play();
Demo: https://jsfiddle.net/cstz9L8v/
References:
https://developer.mozilla.org/en-US/docs/Web/API/KeyframeEffect/KeyframeEffect
https://developer.mozilla.org/en-US/docs/Web/API/Animation
There is an answer on MDN, which is similar to the reflow approach:
<div class="box">
</div>
<div class="runButton">Click me to run the animation</div>
#keyframes colorchange {
0% { background: yellow }
100% { background: blue }
}
.box {
width: 100px;
height: 100px;
border: 1px solid black;
}
.changing {
animation: colorchange 2s;
}
function play() {
document.querySelector(".box").className = "box";
window.requestAnimationFrame(function(time) {
window.requestAnimationFrame(function(time) {
document.querySelector(".box").className = "box changing";
});
});
}
If you create two identical sets of keyframes, you can "restart" the animation by swapping between them:
function restart_animation(element) {
element.classList.toggle('alt')
}
#keyframes spin1 {
to { transform: rotateY(360deg); }
}
#keyframes spin2 {
to { transform: rotateY(360deg); }
}
.spin {
animation-name: spin1;
animation-duration: 2s;
}
.alt {
animation-name: spin2;
}
div {
width: 100px;
background: #8CF;
padding: 5px;
}
<div id=_square class=spin>
<button onclick="restart_animation(_square)">
Click to restart animation
</button>
</div>
On this page you can read about restarting the element animation: Restart CSS Animation (CSS Tricks)
Here is my example:
<head>
<style>
#keyframes selectss
{
0%{opacity: 0.7;transform:scale(1);}
100%{transform:scale(2);opacity: 0;}
}
</style>
<script>
function animation()
{
var elm = document.getElementById('circle');
elm.style.animation='selectss 2s ease-out';
var newone = elm.cloneNode(true);
elm.parentNode.replaceChild(newone, elm);
}
</script>
</head>
<body>
<div id="circle" style="height: 280px;width: 280px;opacity: 0;background-color: aqua;border-radius: 500px;"></div>
<button onclick="animation()"></button>
</body>
But if you want to you can just remove the element animation and then return it:
function animation()
{
var elm = document.getElementById('circle');
elm.style.animation='';
setTimeout(function () {elm.style.animation='selectss 2s ease-out';},10)
}
setInterval(() => {
$('#XMLID_640_').css('animation', 'none')
setTimeout(() => {
$('#XMLID_640_').css('animation', '')
}, 3000)
}, 13000)
Create a second "keyframe#" which restarts you animation, only problem with this you cannot set any animation properties for the restarting animation (it just kinda pops back)
HTML
<div class="slide">
Some text..............
<div id="slide-anim"></div>
</div><br>
<button onclick="slider()"> Animation </button>
<button id="anim-restart"> Restart Animation </button>
<script>
var animElement = document.getElementById('slide-anim');
document.getElementById('anim-restart').addEventListener("mouseup", restart_slider);
function slider() {
animElement.style.animationName = "slider"; // other animation properties are specified in CSS
}
function restart_slider() {
animElement.style.animation = "slider-restart";
}
</script>
CSS
.slide {
position: relative;
border: 3px black inset;
padding: 3px;
width: auto;
overflow: hidden;
}
.slide div:first-child {
position: absolute;
width: 100%;
height: 100%;
background: url(wood.jpg) repeat-x;
left: 0%;
top: 0%;
animation-duration: 2s;
animation-delay: 250ms;
animation-fill-mode: forwards;
animation-timing-function: cubic-bezier(.33,.99,1,1);
}
#keyframes slider {
to {left: 100%;}
}
#keyframes slider-restart {
to {left: 0%;}
}
Note that with React, clearing the animation like this, a codesandbox I found helps.
Example I used in my code:
function MyComponent() {
const [shouldTransition, setShouldTransition] = useState(true);
useEffect(() => {
setTimeout(() => {
// in my code, I change a background image here, and call this hook restart then animation,
// which first clears the animationName
setShouldTransition(false);
}, timeout * 1000);
}, [curr]);
useEffect(() => {
// then restore the animation name after it was cleared
if (shouldTransition === false) {
setShouldTransition(true);
}
}, [shouldTransition]);
return (
<div
ref={ref2}
style={{
animationName: shouldTransition ? "zoomin" : "",
}}
/>
);
}
I found out a simple solution today. Using the example provided in this answer, you can just append the element again to the body:
function resetAnimation() {
let element = document.getElementById('animated');
document.body.append(element);
}
#animated {
position: absolute;
width: 50px;
height: 50px;
background-color: LightSalmon;
animation: bounce 3s ease-in-out infinite;
}
#keyframes bounce {
0% {left: 0;}
50% {left: calc(100% - 50px);}
100% {left: 0;}
}
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<div id="animated"></div>
<button onclick="resetAnimation()">Reset</button>
</body>
</html>
Using Chrome's developer tools, the append does not actually append the element to the body and just replace it, probably because the same reference to the element is used.
first time post here. a beginner.
What I'm trying to do here is that:
I'm trying to display an image of a silhouette of a person. And with every click, the current image fades out and another image of the same person (different position/location) fades in. kind of like an animation except very bare bones.
I made a variable that supposedly controls when certain images fade in or out(var currentscene).The button that calls the function covers the entire page and is invisible because I want the animation to move frame by frame with a click anywhere from the page.
('stand' is an image of a boy standing and 'sit' is an image of a boy sitting) edit: in the example it becomes squareblue and squarered.
(fade-in and fade-out are classes that I add to the image so the transition triggers)
And yet the problem is that a single click will fade in both pictures, as if the number on the variable (currentscene) doesn't matter or the onclick event registered infinite number of clicks or something like that.
Im trying to make the blue square fade in on the first click and the blue fade out and the red fade in on the second click of the button.
If there is a fix to this that would be helpful. If there is a whole another way to do what I'm trying to accomplish, I'm all ears. Although I've tried looking into arrays and EventListeners but I haven't been successful.
heres a recreation of the problem:
var currentscene = 0;
function next() {
currentscene++;
if (currentscene = 1) {
var element = document.getElementById("blue");
element.classList.add("fade-in");
}
if (currentscene = 2) {
var element = document.getElementById("blue");
element.classList.add("fade-out");
var element = document.getElementById("red");
element.classList.add("fade-in");
}
}
.squareblue {
height: 50px;
width: 50px;
top: 50px;
background-color: blue;
position: absolute;
opacity: 0;
animation-fill-mode: forwards;
}
.squarered {
height: 50px;
width: 50px;
top: 100px;
background-color: red;
position: absolute;
opacity: 0;
animation-fill-mode: forwards;
}
.fade-out {
animation: fadeOut ease 2s
}
#keyframes fadeOut {
0% {
opacity: 1;
}
100% {
opacity: 0;
}
}
.fade-in {
animation: fadeIn ease 2s
}
#keyframes fadeIn {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
<div2 id="blue" class="squareblue"></div2>
<div2 id="red" class="squarered"></div2>
<button class="button" onclick="next()">next</button>
I've been trying to find an answer to my problem but I haven't been able to find one.
I want to be able to clear an interval once it's done, but then be able to restart it.
My current code doesn't let me do that: once the interval stops, you can't run it again.
Here's my code:
function about() {
var about = document.getElementById("about")
about.classList.add("about-mi")
var moreinfo = setInterval (function() {
about.classList.remove("about-mi")
}, 2000)
clearInterval(moreinfo)
}
.about-mi {
animation-name: moreinfo;
animation-duration: 2s;
}
#keyframes moreinfo {
0% {color: black;}
50% {color: red; transform: translateY(-20px);}
100% {color: black;}
}
<a onclick="about()">▼</a>
<h2 id=about>About</h2>
I would prefer solutions that only require HTML, CSS, or JavaScript, but I am also open to try solutions that require jQuery.
Actually setInterval doesn't do anything here. You don't need to use interval for that, just use setTimeout.
function about() {
var about = document.getElementById("about")
about.classList.add("about-mi")
var moreinfo = setTimeout(function() {
about.classList.remove("about-mi")
}, 2000)
}
.about-mi {
animation-name: moreinfo;
animation-duration: 2s;
}
#keyframes moreinfo {
0% {
color: black;
}
50% {
color: red;
transform: translateY(-20px);
}
100% {
color: black;
}
}
<a onclick="about()">▼</a>
<h2 id=about>About</h2>
Also you can do this with only CSS
.about-mi {
animation: moreinfo 2s, reset 2.1s;
}
a:active+.about-mi {
animation: anything, reset 2.1s;
}
#keyframes moreinfo {
0% {
color: black;
}
50% {
color: red;
transform: translateY(-20px);
}
100% {
color: black;
}
}
#keyframes reset {
from,
to {
color: black;
transform: unset;
}
}
<p>Wait for the animation to finish before first clicking (2.1s). because the animation starts when the page loads.</p>
▼
<h2 id="about" class="about-mi">About</h2>
As you use the interval timeout to remove the class about-mi to match with the 2 seconds you have defined in your css with animation-duration: 2s; it gets hard to mantain when you start changing one of those values you always have to keep in mind ooooh I also have to update the other one say javascript value and css value
That given, in this case another approach is remove the class based on HTMLElement: animationend event like so:
var aboutElement = document.getElementById("about")
function about() {
aboutElement.classList.add("about-mi")
}
aboutElement.addEventListener("animationend", function(){
aboutElement.classList.remove("about-mi");
});
.about-mi {
animation-name: moreinfo;
animation-duration: 2s;
}
#keyframes moreinfo {
0% {color: black;}
50% {color: red; transform: translateY(-20px);}
100% {color: black;}
}
<a onclick="about()">▼</a>
<h2 id=about>About</h2>
In your specific case, it looks like you only need to run the code once, and not multiple times at intervals, so as #dgknca mentioned, all you need is a setTimeout.
How to restart an interval in general
Answering this in case other users comes across this post. The best you can do (as far as I'm aware) is to define a non-anonymous function with the functionality you want, and then use that in the interval:
function doSomething() {
// your logic here
console.log('I am doing something.');
}
// execute doSomething every 1 second
var interval = setInterval(doSomething, 1000);
Like so, you can cancel the interval using:
clearInterval(interval);
To "restart" the interval, you would need to assign interval to a new interval:
interval = setInterval(doSomething, 1000);
I am having an issue stopping a CSS animation at about 75% of the way complete and then reversing its order and then continuing it using JS. If you run the snippet below and you'll see that you can easily stop and reverse the animation of the cube and reverse it at 50%.
var div = document.getElementById('div');
var timer = setTimeout(function() {
div.classList.add('paused');
}, 1000)
var timer = setTimeout(function() {
div.classList.add('reverse');
div.classList.remove('paused');
}, 1700)
#keyframes animation {
0% {
margin-left: 0px;
}
100% {
margin-left: 200px;
}
}
#div {
width: 100px;
height: 100px;
background-color: red;
animation: animation 2s linear infinite;
}
.paused {
animation-play-state: paused !important;
}
.reverse {
animation-direction: reverse !important;
}
<div id="div"></div>
But, if you try to stop it at 75% and restart it backwards, it starts the paused animation at 25% (Snippet below).
var div = document.getElementById('div');
var timer = setTimeout(function() {
div.classList.add('paused');
}, 1500)
var timer = setTimeout(function() {
div.classList.add('reverse');
div.classList.remove('paused');
}, 1700)
var timer = setTimeout(function() {
div.classList.add('paused');
}, 2800)
#keyframes animation {
0% {
margin-left: 0px;
}
100% {
margin-left: 200px;
}
}
#div {
width: 100px;
height: 100px;
background-color: red;
animation: animation 2s linear infinite;
}
.paused {
animation-play-state: paused !important;
}
.reverse {
animation-direction: reverse !important;
}
<div id="div"></div>
So, my question is, is there a way around this? Some sort of CSS property. I know that this may not be considered a glitch, because at 75% complete on reverse, the box should be at 25%, even though it moves across the screen much too quickly.
I want to apply a random animation on my slideshow image. First, I tried adding an animation such as scale but it didn't work as I wanted it to.
Things I want to fix:
Smoothness on fadein
Random animation (can be anything at this point, I just want to see how it's done)
Fiddle: http://jsfiddle.net/jzhang172/e7cLtsg9/1/
$(function() {
$('img').hide();
function anim() {
$("#wrap img").first().appendTo('#wrap').fadeOut(3500).addClass('transition').addClass('scaleme');
$("#wrap img").first().fadeIn(3500).removeClass('scaleme');
setTimeout(anim, 3700);
}
anim();
});
body,
html {
margin: 0;
padding: 0;
background: black;
}
#wrap img {
position: absolute;
top: 0;
display: none;
width: 100%;
height: 100%;
}
.transition {
transition: 10s;
}
.scaleme {
transition: 10s;
transform: scale(1.3);
}
.box {
height: 300px;
width: 500px;
position: relative;
overflow: hidden;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="box">
<div id="wrap">
<img src="http://elegantthemes.com/preview/InStyle/wp-content/uploads/2008/11/s-1.jpg" />
<img src="http://elegantthemes.com/preview/InStyle/wp-content/uploads/2008/11/s-5.jpg" />
<img src="http://elegantthemes.com/preview/InStyle/wp-content/uploads/2008/11/s-3.jpg" />
</div>
</div>
Here is a sample using CSS animations and jQuery (for achieving the randomness of animations). If you don't wish to use CSS animations and want to stick to transitions + jQuery effects (like fadeIn), you can still adapt this code to support it because the base idea will still remain the same. I am not too comfortable with jQuery effects and have hence stuck to using CSS animations.
Below is an overview of how it is being done (refer inline comments for more details):
Inside a wrapper there are a group of images that are part of the slide-show (like in your demo).
Using CSS #keyframes, a list of animations (one of which would be used randomly) is created in addition to the default fade-in-out animation. This list is also maintained in an array variable (in JS for picking up a random one from the list).
On load, the default fade-in-out animation and one random animation is added to the 1st element.
An animationend event handler is added to all of the images. This event handler will be triggered when the animation on an element ends. When this is triggered, animation on the current element is removed and the default fade-in-out + a random animation is added to the next element.
The animations are added using inline styles because if we add multiple CSS classes each with one different animation, then the animation in the latest class will override the others (that is, they will not happen together).
A loop effect is achieved by checking if the current element has any other img sibling elements. If there are none, the animation is added back to the 1st element.
$(window).load(function() {
$img = $('img'); // the images
var anim = ['zoom', 'shrink', 'move-down-up', 'move-right-left']; // the list of random animations
var rand = Math.floor(Math.random() * 4) + 1; // random number
$img.each(function() { // attach event handler for each image
$(this).on('animationend', function(e) { // when animation on one image has ended
if (e.originalEvent.animationName == 'fade-in-out') { // check the animation's name
rand = Math.floor(Math.random() * 4) + 1; // get a random number
$(this).css('animation-name', 'none'); // remove animation on current element
if ($(this).next('img').length > 0) // if there is a next sibling
$(this).next('img').css('animation-name', 'fade-in-out, ' + anim[rand - 1]); // add animation on next sibling
else
$img.eq(0).css('animation-name', 'fade-in-out, ' + anim[rand - 1]); // else add animation on first image (loop)
}
});
});
$img.eq(0).css('animation-name', 'fade-in-out, ' + anim[rand - 1]); //add animation to 1st element on load
})
#wrapper {
height: 250px;
width: 300px;
position: relative;
}
img {
position: absolute;
z-index: 1;
bottom: 20px;
left: 10px;
opacity: 0;
transform-origin: left top; /* to be on the safe side */
animation-duration: 3s; /* increase only if you want duration to be longer */
animation-fill-mode: backwards; /* fill mode - better to not change */
animation-iteration-count: 1; /* no. of iterations - don't change */
animation-timing-function: ease; /* better to leave as-is but can be changed */
}
#keyframes fade-in-out {
0%, 100% {
opacity: 0;
}
33.33%, 66.66% { /* duration is 3s, so fade-in at 1s, stay till 2s, fade-out from 2s */
opacity: 1;
}
}
#keyframes zoom {
0%, 100% {
transform: scale(1);
}
50% {
transform: scale(1.5);
}
}
#keyframes shrink {
0%, 100% {
transform: scale(1);
}
50% {
transform: scale(.5);
}
}
#keyframes move-down-up {
0%, 100% {
transform: translateY(0px);
}
50% {
transform: translateY(50px);
}
}
#keyframes move-right-left {
0%, 100% {
transform: translateX(0px);
}
50% {
transform: translateX(50px);
}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="wrapper">
<img src="https://placehold.it/200/000000/ffffff" />
<img src="https://placehold.it/200/ff0000/ffffff" />
<img src="https://placehold.it/200/00ff00/ffffff" />
<img src="https://placehold.it/200/0000ff/ffffff" />
</div>