#<DOMException> when setting onmidimessage

[DominikKrajcer]

Hello,

In a node.js environment when I set onmidimessage I get:
(node:59882) UnhandledPromiseRejectionWarning: #< DOMException >

var navigator = require('jzz');

const onSuccess = (midiAccess) => {
  for (const input of midiAccess.inputs.values()) {
    input.onmidimessage = console.log;
  }
};

const onFail = console.log;
navigator.requestMIDIAccess().then(onSuccess, onFail);

Tested on win and mac.
node: v12.18.0

@jazz-soft

[jazz-soft]

Please try this change:

//input.onmidimessage = console.log;
input.onmidimessage = function(msg) { console.log(msg); }

//const onFail = console.log;
const onFail = function(err) { console.log(err); }

[DominikKrajcer]

Unfortunately it doesn't work. I've also tried web-midi-api lib and below 2.0.6 I could set onmidimessage but my keyboard couldn't trigger it and above this ver I got DOMException error. I have such a problem just in node.js

[DominikKrajcer]

@jazz-soft
I've tried to open a port before assigning onmidimessage but I got this error (win and mac) reject(new DOMException('InvalidAccessError', 'Port is not available', 15))

DOMException {
  name: 'InvalidAccessError',
  message: 'Port is not available',
  code: 15
}

[DominikKrajcer]

@jazz-soft Have you reproduced it?

[jazz-soft]

This seems to be a valid Web MIDI exception when the port is used by another application and cannot be open.
Let me double check the specs...

[jazz-soft]

Ok, for some reason your port cannot be open. (Most likely, used by another app.)
According to specs, open() should throw, but onmidimessage should not.
Thanks a lot for catching this!
Please try the latest version.