HTMLMediaElement: loadstart-Ereignis

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.

Das loadstart-Ereignis wird ausgelöst, wenn der Browser begonnen hat, eine Ressource zu laden.

Syntax

Verwenden Sie den Ereignisnamen in Methoden wie addEventListener() oder setzen Sie eine Ereignis-Handler-Eigenschaft.

js
addEventListener("loadstart", (event) => {});

onloadstart = (event) => {};

Ereignistyp

Ein generisches Event.

Beispiele

Live-Beispiel

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://interactive-examples.mdn.mozilla.net/media/cc0-videos/flower.webm",
    );
    source.setAttribute("type", "video/webm");

    video.appendChild(source);
  }
});

Ergebnis

Spezifikationen

Specification
HTML
# event-media-loadstart
HTML
# handler-onloadstart

Browser-Kompatibilität

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
loadstart event

Legend

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

Full support
Full support

Siehe auch