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HTML Audio/Video DOM loadstart Event

❮ HTML Audio/Video DOM Reference


Alert that the video is starting to load:

var vid = document.getElementById("myVideo");
vid.onloadstart = function() {
    alert("Starting to load video");
Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The loadstart event occurs when the browser starts looking for the specified audio/video. This is when the loading process starts.

During the loading process of an audio/video, the following events occur, in this order:

  1. loadstart
  2. durationchange
  3. loadedmetadata
  4. loadeddata
  5. progress
  6. canplay
  7. canplaythrough

Browser Support

The numbers in the table specify the first browser version that fully supports the event.

loadstart Yes 9.0 Yes Yes Yes



<audio|video onloadstart="myScript">Try it

In JavaScript:

audio|video.onloadstart=function(){myScript};Try it

In JavaScript, using the addEventListener() method:

audio|video.addEventListener("loadstart", myScript);Try it

Technical Details

Supported HTML tags: <audio> and <video>
Supported JavaScript objects: Audio, Video

More Examples


Alert that the audio is starting to load:

var aud = document.getElementById("myAudio");
aud.onloadstart = function() {
    alert("Starting to load video");
Try it Yourself »

❮ HTML Audio/Video DOM Reference