open() method of the
MIDIPort interface makes the MIDI device connected to this
MIDIPort explicitly available.
If the port is successfully opened a new
MIDIConnectionEvent is queued to the
MIDIAccess.onstatechange event handlers, and the
MIDIPort.connection property is changed to
If the port is already open when this method is called, then the promise will resolve successfully.
Promise which resolves once access to the port has been successfully obtained.
The promise is rejected with this error if the port is unavailable and cannot be opened.
The following example shows an output port being opened.
var output = midiAccess.outputs.get(portID); output.open(); // opens the port
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