HTMLElement: transitionrun event

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规范
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transitionrun event is fired when a CSS transition is first created, i.e. before any transition-delay has begun.

冒泡	Yes
可取消	No
接口	`TransitionEvent`
事件处理程序特性	`ontransitionrun`

范例

This code adds a listener to the transitionrun event:

el.addEventListener('transitionrun', () => {
  console.log('Transition is running but hasn\'t necessarily started transitioning yet');
});

一样，但使用 ontransitionrun property instead of addEventListener() :

el.ontransitionrun = () => {
  console.log('Transition started running, and will start transitioning when the transition delay has expired');
};

实时范例

In the following example, we have a simple <div> element, styled with a transition that includes a delay:

<div class="transition">Hover over me</div>
<div class="message"></div>

.transition {
  width: 100px;
  height: 100px;
  background: rgba(255,0,0,1);
  transition-property: transform, background;
  transition-duration: 2s;
  transition-delay: 1s;
}
.transition:hover {
  transform: rotate(90deg);
  background: rgba(255,0,0,0);
}

To this, we'll add some JavaScript to indicate where the transitionstart and transitionrun events fire.

const el = document.querySelector('.transition');
const message = document.querySelector('.message');
el.addEventListener('transitionrun', function() {
  message.textContent = 'transitionrun fired';
});
el.addEventListener('transitionstart', function() {
  message.textContent = 'transitionstart fired';
});
el.addEventListener('transitionend', function() {
  message.textContent = 'transitionend fired';
});

The difference is that:

transitionrun fires when the transition is created (i.e. at the start of any delay).
transitionstart fires when the actual animation has begun (i.e. at the end of any delay).

transitionrun will occur even if the transition is canceled before the delay expires. If there is no transition delay or if transition-delay is negative, both transitionrun and transitionstart are fired.

规范

规范	状态	注释
CSS Transitions The definition of 'transitionrun' in that specification.	工作草案

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`transitionrun` event	Chrome 74	Edge ≤79	Firefox 53	IE ?	Opera 62	Safari 13.1 13.1 12 Disabled Disabled From version 12: this feature is behind the `Web 动画` preference and the `CSS Animations via Web Animations` preference.	WebView Android 74	Chrome Android 74	Firefox Android 53	Opera Android 53	Safari iOS 13.4 13.4 12 Disabled Disabled From version 12: this feature is behind the `Web 动画` preference and the `CSS Animations via Web Animations` preference.	Samsung Internet Android 11.0

图例

完整支持
兼容性未知 ?
用户必须明确启用此特征。

另请参阅

GlobalEventHandlers.ontransitionrun event handler
TransitionEvent interface
CSS properties: transition , transition-delay , transition-duration , transition-property , transition-timing-function
相关事件： transitionend , transitionstart , transitioncancel
此事件在 Document 目标： transitionrun
此事件在 Window 目标： transitionrun

元数据

最后修改： Jul 27, 2020

HTMLElement
特性
方法
1. click()
2. forceSpellCheck()
事件
1. animationcancel
2. animationend
3. animationiteration
4. animationstart
5. beforeinput
6. change
7. gotpointercapture
8. input
9. lostpointercapture
10. pointercancel
11. pointerdown
12. pointerenter
13. pointerleave
14. pointermove
15. pointerout
16. pointerover
17. pointerup
18. transitioncancel
19. transitionend
20. transitionrun
21. transitionstart
继承：

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范例

实时范例

规范

浏览器兼容性

图例

另请参阅

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