Element: animationiteration event
The animationiteration
event is fired when an iteration of a CSS Animation ends, and another one begins. This event does not occur at the same time as the animationend
event, and therefore does not occur for animations with an animation-iteration-count
of one.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
js
addEventListener("animationiteration", (event) => {});
onanimationiteration = (event) => {};
Event type
An AnimationEvent
. Inherits from Event
.
Event properties
Also inherits properties from its parent Event
.
AnimationEvent.animationName
Read only-
A string containing the value of the
animation-name
that generated the animation. AnimationEvent.elapsedTime
Read only-
A
float
giving the amount of time the animation has been running, in seconds, when this event fired, excluding any time the animation was paused. For ananimationstart
event,elapsedTime
is0.0
unless there was a negative value foranimation-delay
, in which case the event will be fired withelapsedTime
containing(-1 * delay)
. AnimationEvent.pseudoElement
Read only-
A string, starting with
'::'
, containing the name of the pseudo-element the animation runs on. If the animation doesn't run on a pseudo-element but on the element, an empty string:''
.
Examples
This code uses animationiteration
to keep track of the number of iterations an animation has completed:
js
const animated = document.querySelector(".animated");
let iterationCount = 0;
animated.addEventListener("animationiteration", () => {
iterationCount++;
console.log(`Animation iteration count: ${iterationCount}`);
});
The same, but using the onanimationiteration
event handler property:
js
const animated = document.querySelector(".animated");
let iterationCount = 0;
animated.onanimationiteration = () => {
iterationCount++;
console.log(`Animation iteration count: ${iterationCount}`);
};
Live example
HTML
html
<div class="animation-example">
<div class="container">
<p class="animation">You chose a cold night to visit our planet.</p>
</div>
<button class="activate" type="button">Activate animation</button>
<div class="event-log"></div>
</div>
CSS
css
.container {
height: 3rem;
}
.event-log {
width: 25rem;
height: 2rem;
border: 1px solid black;
margin: 0.2rem;
padding: 0.2rem;
}
.animation.active {
animation-duration: 2s;
animation-name: slidein;
animation-iteration-count: 2;
}
@keyframes slidein {
from {
transform: translateX(100%) scaleX(3);
}
to {
transform: translateX(0) scaleX(1);
}
}
JavaScript
js
const animation = document.querySelector("p.animation");
const animationEventLog = document.querySelector(
".animation-example>.event-log"
);
const applyAnimation = document.querySelector(
".animation-example>button.activate"
);
let iterationCount = 0;
animation.addEventListener("animationstart", () => {
animationEventLog.textContent = `${animationEventLog.textContent}'animation started' `;
});
animation.addEventListener("animationiteration", () => {
iterationCount++;
animationEventLog.textContent = `${animationEventLog.textContent}'animation iterations: ${iterationCount}' `;
});
animation.addEventListener("animationend", () => {
animationEventLog.textContent = `${animationEventLog.textContent}'animation ended'`;
animation.classList.remove("active");
applyAnimation.textContent = "Activate animation";
});
animation.addEventListener("animationcancel", () => {
animationEventLog.textContent = `${animationEventLog.textContent}'animation canceled'`;
});
applyAnimation.addEventListener("click", () => {
animation.classList.toggle("active");
animationEventLog.textContent = "";
iterationCount = 0;
const active = animation.classList.contains("active");
applyAnimation.textContent = active
? "Cancel animation"
: "Activate animation";
});
Result
Specifications
Specification |
---|
CSS Animations Level 1 # eventdef-globaleventhandlers-animationiteration |
Browser compatibility
BCD tables only load in the browser
See also
- CSS Animations
- Using CSS Animations
AnimationEvent
- Related events:
animationstart
,animationend
,animationcancel
- This event on
Document
targets:animationiteration
- This event on
Window
targets:animationiteration