HTMLElement: animationiteration event
animationiteration
事件将被触发 当CSS 动画的迭代结束且另一个迭代开始时。此事件不会与 animationend
事件同时发生 t,因此对于animation-iteration-count
次数为 1 的动画不会发生。
Bubbles | Yes |
---|---|
Cancelable | No |
Interface | AnimationEvent |
Event handler property | onanimationiteration |
例子
此代码使用 animationiteration
来跟踪动画已完成的迭代次数:
const animated = document.querySelector('.animated');
let iterationCount = 0;
animated.addEventListener('animationiteration', () => {
iterationCount++;
console.log(`Animation iteration count: ${iterationCount}`);
});
相同,但使用 onanimationiteration
事件处理程序属性:
const animated = document.querySelector('.animated');
let iterationCount = 0;
animated.onanimationiteration = () => {
iterationCount++;
console.log(`Animation iteration count: ${iterationCount}`);
};
鲜活的范例
HTML
<div class="animation-example">
<div class="container">
<p class="animation">You chose a cold night to visit our planet.</p>
</div>
<button class="activate" type="button">Activate animation</button>
<div class="event-log"></div>
</div>
CSS
.container {
height: 3rem;
}
.event-log {
width: 25rem;
height: 2rem;
border: 1px solid black;
margin: 0.2rem;
padding: 0.2rem;
}
.animation.active {
animation-duration: 2s;
animation-name: slidein;
animation-iteration-count: 2;
}
@keyframes slidein {
from {
transform: translateX(100%) scaleX(3);
}
to {
transform: translateX(0) scaleX(1);
}
}
JS
const animation = document.querySelector('p.animation');
const animationEventLog = document.querySelector('.animation-example>.event-log');
const applyAnimation = document.querySelector('.animation-example>button.activate');
let iterationCount = 0;
animation.addEventListener('animationstart', () => {
animationEventLog.textContent = `${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;
let active = animation.classList.contains('active');
if (active) {
applyAnimation.textContent = "Cancel animation";
} else {
applyAnimation.textContent = "Activate animation";
}
});
结果
规范
Specification | Status | Comment |
---|---|---|
CSS Animations Level 1 | Working Draft | Initial definition |
浏览器兼容性
BCD tables only load in the browser
了解更多
- CSS Animations
- Using CSS Animations
AnimationEvent
- Related events:
animationstart
,animationend
,animationcancel
This event on
Document
targets:animationiteration
(en-US)This event on
Window
targets:animationiteration
(en-US)