MIDIPort.open()

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

The 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 MIDIPort.onstatechange and MIDIAccess.onstatechange event handlers, and the MIDIPort.connection property is changed to "open".

If the port is already open when this method is called, then the promise will resolve successfully.

Syntax

var output = midiAccess.outputs.get(portID);
output.open(); // opens the port

Parameters

None.

Return value

A Promise which resolves once access to the port has been successfully obtained.

Exceptions

DOMException InvalidAccessError

The promise is rejected with this error if the port is unavailable and cannot be opened.

Examples

The following example shows an output port being opened.

var output = midiAccess.outputs.get(portID);
output.open(); // opens the port

Specifications

Specification
Web MIDI API
# dom-midiport-open

Browser compatibility

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