HTMLMediaElement: progress event

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

progress 事件在浏览器加载一个资源的时候周期性触发。

Bubbles No
Cancelable No
Interface Event
Event handler property onprogress

示例

HTML

html
<div class="example">
  <button type="button">Load video</button>
  <video controls width="250"></video>

  <div class="event-log">
    <label>Event log:</label>
    <textarea readonly class="event-log-contents"></textarea>
  </div>
</div>

JavaScript

js
const loadVideo = document.querySelector("button");
const video = document.querySelector("video");
const eventLog = document.querySelector(".event-log-contents");
let source = null;

function handleEvent(event) {
  eventLog.textContent = eventLog.textContent + `${event.type}\n`;
}

video.addEventListener("loadstart", handleEvent);
video.addEventListener("progress", handleEvent);
video.addEventListener("canplay", handleEvent);
video.addEventListener("canplaythrough", handleEvent);

loadVideo.addEventListener("click", () => {
  if (source) {
    document.location.reload();
  } else {
    loadVideo.textContent = "Reset example";
    source = document.createElement("source");
    source.setAttribute(
      "src",
      "https://mdn.github.io/learning-area/html/multimedia-and-embedding/video-and-audio-content/rabbit320.mp4",
    );
    source.setAttribute("type", "video/mp4");

    video.appendChild(source);
  }
});

结果

规范

Specification
HTML
# event-media-progress
HTML
# handler-onprogress

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
progress event

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见