MediaStreamTrack: mute event - Web APIs 编辑

The mute event is sent to a MediaStreamTrack when the track's source is temporarily unable to provide media data. When the track is once again able to produce media output, an unmute event is sent.

During the time between the mute event and the unmute event, the value of the track's muted property is true.

Note: The condition that most people think of as "muted" (that is, a user-toggled state of silencing a track) is actually managed using the MediaStreamTrack.enabled property, for which there are no events.

Examples

In this example, event handlers are established for the mute and unmute events in order to detect when the media is not flowing from the source for the MediaStreamTrack referenced by musicTrack.

musicTrack.addEventListener("mute", event => {
  document.getElementById("timeline-widget").style.backgroundColor = "#aaa";
}, false);

musicTrack.addEventListener("unmute", event => {
 document.getElementById("timeline-widget").style.backgroundColor = "#fff";
}, false);

With these event handlers in place, when the track musicTrack enters its muted state, the element with the ID timeline-widget gets its background color changed to #aaa. When the track exits the muted state—detected by the arrival of an unmute event—the background color is restored to white.

You can also use the onmute event handler property to set up a handler for this event; similarly, the onunmute event handler is available for setting up a handler for the unmute event. The following example shows this:

musicTrack.onmute = event => {
  document.getElementById("timeline-widget").style.backgroundColor = "#aaa";
}

musicTrack.mute = event = > {
  document.getElementById("timeline-widget").style.backgroundColor = "#fff";
}

Specifications

Browser compatibility

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See also

• onmute event handler property
• unmute event