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djipco / webmidi

Tame the Web MIDI API. Send and receive MIDI messages with ease. Control instruments with user-friendly functions (playNote, sendPitchBend, etc.). React to MIDI input with simple event listeners (noteon, pitchbend, controlchange, etc.).
Apache License 2.0
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Checking for existing Listener doesn't work #423

Closed aphleps closed 3 months ago

aphleps commented 4 months ago

Description Adding new listeners works as expected

  function noteListener(e: NoteMessageEvent) {
    console.log(e);
  }

device.addListener("noteon", noteListener)

Removing listeners also works

device.removeListener("noteon");

However, the following functions do not seem to work for me

device.hasListener("noteon", noteListener) always returns false

device.getListenerCount("noteon") always returns 0

Environment: React 18.2.0 Vite 5.0.8 webmidi 3.1.9

djipco commented 4 months ago

There are unit tests that check if hasListener() is working properly and, as far as I can tell, everything is working as it should. If you can provide a code example that reproduces this problem, that would be helpful. It would also help to know if device references an Input or an InputChannel object.