MIDIAccess: statechange event

The statechange event of the MIDIAccess interface is fired when a new MIDI port is added or when an existing port changes state.

Use the event name in methods like addEventListener(), or set an event handler property.

addEventListener('statechange', event => { });

onstatechange = event => { };

A MIDIConnectionEvent. Inherits from Event.

MIDIConnectionEvent.port Read only

Returns a reference to a MIDIPort instance for a port that has been connected or disconnected.

The Navigator.requestMIDIAccess() method returns a promise that resolves with a MIDIAccess object. When a port changes state, information about that port is printed to the console.

navigator.requestMIDIAccess()
  .then(function(access) {
     access.onstatechange = event => {
       console.log(event.port.name, event.port.manufacturer, event.port.state);
     };
  });