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 Juli 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", "/shared-assets/videos/flower.webm"); source.setAttribute("type", "video/webm"); video.appendChild(source); } }); Ergebnis
Spezifikationen
| Specification |
|---|
| HTML # event-media-loadstart |
| HTML # handler-onloadstart |