HTMLMediaElement: progress イベント
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
イベントは、ブラウザーがリソースを読み込むときに定期的に発生します。
このイベントはキャンセル不可で、バブリングしません。
構文
このイベントを addEventListener()
などのメソッドで使用するか、イベントハンドラープロパティを設定するかしてください。
js
addEventListener("progress", (event) => {});
onprogress = (event) => {};
イベント型
一般的な Event
です。
例
ライブデモ
HTML
html
<div class="example">
<button type="button">Load video</button>
<video controls width="250"></video>
<div class="event-log">
<label for="eventLog">Event log:</label>
<textarea readonly class="event-log-contents" id="eventLog"></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 += `${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);
}
});
結果
仕様書
Specification |
---|
HTML # event-media-progress |
HTML # handler-onprogress |
ブラウザーの互換性
Report problems with this compatibility data on GitHubdesktop | mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
progress event |
Legend
Tip: you can click/tap on a cell for more information.
- Full support
- Full support
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.