MIDIPort: statechange event

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.

Syntax

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

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

onstatechange = event => { };

Event type

Event properties

MIDIConnectionEvent.portRead only

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

Example

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

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

Specifications

Specification
Web MIDI API
# dom-midiport-onstatechange

Browser compatibility

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