HTMLMediaElement: loadstart event
The loadstart
event is fired when the browser has started to load a resource.
Syntax
Use the event name in methods like addEventListener()
, or set an event handler property.
addEventListener('loadstart', (event) => {});
onloadstart = (event) => { };
Event type
A generic Event
.
Examples
Live example
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
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/examples/flower.webm');
source.setAttribute('type', 'video/webm');
video.appendChild(source);
}
});
Result
Specifications
Specification |
---|
HTML Standard # event-media-loadstart |
HTML Standard # handler-onloadstart |
Browser compatibility
BCD tables only load in the browser