MIDIPort: statechange event

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 statechange event of the MIDIPort interface is fired when a port changes from open to closed, or closed to open.

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

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

onstatechange = (event) => {};

MIDIConnectionEvent.port Read only: Returns a reference to a MIDIPort instance for a port that has been connected or disconnected.

In the following example the current MIDIPort.state is logged each time it changes.

port.onstatechange = (event) => {
  console.log(port.state);
};

Specification
Web MIDI API # dom-midiport-onstatechange

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