Media events

Various events are sent when handling media that are embedded in HTML documents using the <audio> and <video> elements; this section lists them and provides some helpful information about using them.

Event name Description
abort Sent when playback is aborted; for example, if the media is playing and is restarted from the beginning, this event is sent.
canplay Sent when enough data is available that the media can be played, at least for a couple of frames.  This corresponds to the CAN_PLAY readyState.
canplaythrough Sent when the ready state changes to CAN_PLAY_THROUGH, indicating that the entire media can be played without interruption, assuming the download rate remains at least at the current level. Note: Manually setting the currentTime will eventually fire a canplaythrough event in firefox. Other browsers might not fire this event.
durationchange The metadata has loaded or changed, indicating a change in duration of the media.  This is sent, for example, when the media has loaded enough that the duration is known.
emptied The media has become empty; for example, this event is sent if the media has already been loaded (or partially loaded), and the load() method is called to reload it.
ended Sent when playback completes.
error Sent when an error occurs.  The element's error attribute contains more information. See Error handling for details.
loadeddata The first frame of the media has finished loading.
loadedmetadata The media's metadata has finished loading; all attributes now contain as much useful information as they're going to.
loadstart Sent when loading of the media begins.
mozaudioavailable Sent when an audio buffer is provided to the audio layer for processing; the buffer contains raw audio samples that may or may not already have been played by the time you receive the event.
pause Sent when playback is paused.
play Sent when playback of the media starts after having been paused; that is, when playback is resumed after a prior pause event.
playing Sent when the media begins to play (either for the first time, after having been paused, or after ending and then restarting).
progress Sent periodically to inform interested parties of progress downloading the media. Information about the current amount of the media that has been downloaded is available in the media element's buffered attribute.
ratechange Sent when the playback speed changes.
seeked Sent when a seek operation completes.
seeking Sent when a seek operation begins.
stalled Sent when the user agent is trying to fetch media data, but data is unexpectedly not forthcoming.
suspend Sent when loading of the media is suspended; this may happen either because the download has completed or because it has been paused for any other reason.
timeupdate The time indicated by the element's currentTime attribute has changed.
volumechange Sent when the audio volume changes (both when the volume is set and when the muted attribute is changed).
waiting Sent when the requested operation (such as playback) is delayed pending the completion of another operation (such as a seek).

You can easily watch for these events, using code such as the following:

var v = document.getElementsByTagName("video")[0];
v.addEventListener("seeked", function() { document.getElementsByTagName("video")[0].play(); }, true);
v.currentTime = 10.0;

This example fetches the first video element in the document and attaches an event listener to it, watching for the seeked event, which is sent whenever a seek operation completes.  The listener simply calls the element's play() method, which starts playback.

Then, in line 3, the example sets the element's currentTime attribute to 10.0, which initiates a seek operation to the 10-second mark in the media.  This causes a seeking event to be sent when the operation begins, then a seeked event to be dispatched when the seek is completed.

In other words, this example seeks to the 10-second mark in the media, then begins playback as soon as that's finished.

Compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support ? 3.5 (1.9.1) (Prior to Gecko 2.0, media events bubbled.) ? ? ?
load ? Removed in 3.6 (1.9.2) ? ? ?
mozaudioavailable Not supported 4.0 (2.0) Not supported Not supported Not supported
suspend ? 3.6 (1.9.2) ? ? ?
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? ? ? ? ?
load ? ? ? ? ?
mozaudioavailable Not supported 4.0 (2.0) Not supported Not supported Not supported
suspend ? ? ? ? ?

 

Document Tags and Contributors

Contributors to this page: Aria, jswisher, oncletom, Jeremie, Sheppy
Last updated by: Jeremie,