MIDIPort: open() method
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
js
open()
Parameters
None.
Return value
A Promise which resolves once access to the port has been successfully obtained.
Exceptions
InvalidAccessErrorDOMException-
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.
js
const output = midiAccess.outputs.get(portID);
output.open(); // opens the port
Specifications
| Specification |
|---|
| Web MIDI API # dom-midiport-open |
Browser compatibility
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