MIDIMessageEvent

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The MIDIMessageEvent interface of the Web MIDI API represents the event passed to the midimessage event of the MIDIInput interface. A midimessage event is fired every time a MIDI message is sent from a device represented by a MIDIInput, for example when a MIDI keyboard key is pressed, a knob is tweaked, or a slider is moved.

Constructor

MIDIMessageEvent(): Creates a new MIDIMessageEvent object instance.

Instance properties

This interface also inherits properties from Event.

MIDIMessageEvent.data: A Uint8Array containing the data bytes of a single MIDI message. See the MIDI specification for more information on its form.

Instance methods

This interface doesn't implement any specific methods, but inherits methods from Event.

Examples

The following example prints all MIDI messages to the console.

navigator.requestMIDIAccess().then((midiAccess) => {
  Array.from(midiAccess.inputs).forEach((input) => {
    input[1].onmidimessage = (msg) => {
      console.log(msg);
    };
  });
});

Specifications

Specification
Web MIDI API # midimessageevent-interface

Browser compatibility

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