SVGAnimationElement: beginEvent event - Web APIs 编辑

The beginEvent event of the SVGAnimationElement interface is fired when the element local timeline begins to play. It will be raised each time the element begins the active duration (i.e., when it restarts, but not when it repeats).

It may be raised both in the course of normal (i.e. scheduled or interactive) timeline play, as well as in the case that the element was begun with a DOM method.

Examples

Animated circle

<svg xmlns="http://www.w3.org/2000/svg" width="300px" height="100px">
  <title>SVG SMIL Animate with Path</title>
  <circle cx="0" cy="50" r="50" fill="blue" stroke="black" stroke-width="1">
    <animateMotion
       path="M 0 0 H 300 Z"
       dur="5s" repeatCount="indefinite" />
  </circle>
</svg>

<hr>

<ul>

</ul>

ul {
  height: 100px;
  border: 1px solid #ddd;
  overflow-y: scroll;
  padding: 10px 30px;
}

let svgElem = document.querySelector('svg');
let animateElem = document.querySelector('animateMotion');
let list = document.querySelector('ul');

animateElem.addEventListener('beginEvent', () => {
  let listItem = document.createElement('li');
  listItem.textContent = 'beginEvent fired';
  list.appendChild(listItem);
})

animateElem.addEventListener('repeatEvent', (e) => {
  let listItem = document.createElement('li');
  let msg = 'repeatEvent fired';
  if(e.detail) {
    msg += '; repeat number: ' + e.detail;
  }
  listItem.textContent = msg;
  list.appendChild(listItem);
})

Event handler property equivalent

Note that you can also create an event listener for the begin event using the onbegin event handler property:

animateElem.onbegin = () => {
  console.log('beginEvent fired');
}

Specifications

Browser compatibility

BCD tables only load in the browser

See also

• SVG animation with SMIL
• endEvent
• repeatEvent