Develop Reference

how to use if statement inside an event listener? [duplicate]

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.

How do I make something I click fade out and in before it goes to another website linked in the page?

So I'm coding this website and I what I want it to do before it changes to another website that I linked to the whole page is fade out. And when it's finally in the website, it fades in.
Does anybody know the code to this?

You can have a css animation for your fade-out and then use setTimeout() in js to delay the process and navigate to a new page via js after the animation is done
(instead of <a> tag)
function navigate(){
const element = document.querySelector('.otherWebsite');
element.classList.add('animation'); // setting the animation class to the element
setTimeout(() =>{
location.assign('https://stackoverflow.com')
} , 3000) // delaying the process of the navigation for 3s (3000ms)
}
.otherWebsite{
padding: 10px;
background-color: green;
color: #fff;
}
.animation{
animation: fadeout 3s linear 1 forwards;
}
#keyframes fadeout {
from{
opacity: 1;
}
to{
opacity: 0;
}
}
<div class="otherWebsite" onclick="navigate()">Click here</div>
Note: You can also make the js function flexible for multiple tags using data-href or your preferred data set
document.querySelectorAll('[data-href]').forEach(element =>{ // looping though all tags with 'data-href' in the page
// setting an onclick event listener for the element
element.onclick = () =>{
element.classList.add('animation') // setting animation class to element
const link = element.dataset.href || element.getAttribute('data-href'); // getting the link from the 'data-href' attribute
setTimeout(() => location.assign(link) , 3000) // navigate to a new website after 3s (3000ms)
}
})
.otherWebsite{
padding: 10px;
background-color: green;
color: #fff;
margin: 10px 0px;
}
.animation{
animation: fadeout 3s linear 1 forwards;
}
#keyframes fadeout {
from{
opacity: 1;
}
to{
opacity: 0;
}
}
<div class="otherWebsite" data-href="https://stackoverflow.com">Website (stackoverflow)</div>
<div class="otherWebsite" data-href="https://google.com">Website 2 (google)</div>

How to restart a keyframe animation with setInterval?

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);

How do I trigger a CSS keyframe animation by pressing a key on the keyboard? [duplicate]

Naturally, we can create a CSS animation using keyframes, and control it from there.
However, ideally, I would like to trigger this animation from a button click - so the button click would be an event...
#keyframes fade-in {
0% {opacity: 0;}
100% {opacity: 1;}
}
Now, on click, I want to trigger this animation; as opposed to from within the CSS animation property.

see here jsfiddle
if you want your animation to work every time you press the button use this code :
$('button').click(function() {
$(".fademe").addClass('animated');
setTimeout(function() {
$(".fademe").removeClass('animated');
}, 1500);
});
where 1500 is the animation-duration in this case, 1.5s
$('button').click(function() {
$(".fademe").addClass('animated');
setTimeout(function() {
$(".fademe").removeClass('animated');
}, 1500);
});
.fademe {
width: 100px;
height: 100px;
background: red;
}
.fademe.animated {
animation: fade-in 1.5s ease;
}
#keyframes fade-in {
0% {
opacity: 0;
}
100% {
opacity: 1;
}
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="fademe">
</div>
<button>CLICK ME</button>
EXPLANATION :
on click on the button add class animated ( or any other class ) to the element you want to apply the animation to , .fademe
make a setTimeout(function() to delay the removeClass for the duration of the animation 1.5s or 1500ms
write in CSS the declaration of the animation , #keyframes, and add it to the element with the class added by the JQ .fademe.animated

$("#move-button").on("click", function(){
$("#ship").removeClass("moving");
$("#ship")[0].offsetWidth = $("#ship")[0].offsetWidth;
$("#ship").addClass("moving");
});//
#ship
{
background: green;
color: #fff;
height: 60px;
line-height: 60px;
text-align: center;
width: 100px;
}
#move-button
{
margin-top: 20px;
}
#ship.moving
{
animation: moving 2s ease;
}
#keyframes moving
{
0%{ transform: translate(0px);}
50%{ transform: translate(20px);}
100%{ transform: translate(0px);}
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<div id="ship">Ship</div>
<button id="move-button">Push</button>

If you want to make the animation happen and always end before allowing the event listener to trigger it again, I would suggest to control the behaviour like this:
// Add this to your event listener
if (!element.classList.contains("myClass")) {
element.className = "myClass";
setTimeout(function() {
element.classList.remove("myClass");
}, 1000); //At least the time the animation lasts
}

There is a toggle method that works just fine for this, hope it helps:
function Fade() {
document.getElementById("box").classList.toggle("animate");
}
#box {
background-color: black;
height: 50px;
width: 50px;
}
.animate {
animation: fademe 0.5s;
}
#keyframes fademe {
from {
opacity: 1;
}
to {
opacity: 0;
}
}
<html>
<head>
<title>
Animation Trigger
</title>
</head>
<body>
<div id="box"></div>
<button onclick="Fade()"> Fade above Box</button>
</body>

Let the animation at its end state JS/CSS

Here's my problem :
I'm developping a little animation with JS and CSS, and I would like this stop when the animation is over. Now, my animation go back to his basic state.
var
btn = document.getElementById("btn");
anim = document.getElementById("anim");
// button click event
btn.addEventListener("click", ToggleAnimation, false);
// apply all webkit events
anim.addEventListener("webkitAnimationStart", AnimationListener);
anim.addEventListener("webkitAnimationIteration", AnimationListener);
anim.addEventListener("webkitAnimationEnd", AnimationListener);
// and standard events
anim.addEventListener("animationstart", AnimationListener);
anim.addEventListener("animationiteration", AnimationListener);
anim.addEventListener("animationend", AnimationListener);
// handle animation events
function AnimationListener(e) {
if (e.type.toLowerCase().indexOf("animationend") >= 0) {
ToggleAnimation();
}
}
// start/stop animation
function ToggleAnimation(e) {
var on = (anim.className != "");
anim.className = (on ? "" : "enable");
};
#anim
{
display: block;
width: 150px;
height:150px;
background-color: #060;
}
#anim.enable
{
-webkit-animation: flash 1s ease;
animation: flash 1s ease;
animation-fill-mode: forwards;
-webkit-animation-fill-mode: forwards;
}
/* animation */
#-webkit-keyframes flash {
50% { margin-top:50px; }
}
#keyframes flash {
50% { margin-top:50px; }
}
<button id="btn">
Launch animation
</button>
<p><a id="anim" href="#"></a></p>
Here's my FIDDLE. I think the problem is in the function "ToggleAnimation" but I can't find what.
Thanks in advance and had a good day.
Azyme

I think I have achieved what you are trying to - changed the animation to have a start and end state (0% and 100%) and used jquery to add the class "enable" rather than toggle it
css
#-webkit-keyframes flash {
0% { margin-top: 0}
100% { margin-top:50px; }
}
#keyframes flash {
0% { margin-top: 0}
100% { margin-top:50px; }
}
jquery
$('#btn').click(function(){
$('#anim').addClass("enable");
})
hope thats helpful, made a codepen http://codepen.io/anon/pen/vLLKoZ