MediaSession.setActionHandler

The setActionHandler() property of the MediaSession interface sets an event handler for a media session action.

Syntax

navigator.mediaSession.setActionHandler(type, callback)

Parameters

type

A string representing an action type to listen for. It will be one of play, pause, seekbackward, seekforward, previoustrack, or nexttrack.

callback

Indicates the function to call when the specified action type is invoked. This is a void function, with no parameters.

Returns

void

Examples

The following example creates a new media session and assigns action handlers to it:

if ('mediaSession' in navigator){
  navigator.mediaSession.metadata = new MediaMetadata({
    title: "Podcast Episode Title",
    artist: "Podcast Host",
    album: "Podcast Name",
    artwork: [{src: "podcast.jpg"}]
  });
  navigator.mediaSession.setActionHandler('play', function() {});
  navigator.mediaSession.setActionHandler('pause', function() {});
  navigator.mediaSession.setActionHandler('seekbackward', function() {});
  navigator.mediaSession.setActionHandler('seekforward', function() {});
  navigator.mediaSession.setActionHandler('previoustrack', function() {});
  navigator.mediaSession.setActionHandler('nexttrack', function() {});
}

This example uses appropriate action handlers to allow seeking in either direction through the playing media.

let skipTime = 10 // Time to skip in seconds

navigator.mediaSession.setActionHandler('seekbackward', evt => {
  // User clicked "Seek Backward" media notification icon.
  audio.currentTime = Math.max(audio.currentTime - skipTime, 0)
})

navigator.mediaSession.setActionHandler('seekforward', evt => {
  // User clicked "Seek Forward" media notification icon.
  audio.currentTime = Math.min(audio.currentTime + skipTime,    
                               audio.duration)
})

Specifications

Browser Compatibility