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This repository was archived by the owner on Feb 6, 2026. It is now read-only.
This repository was archived by the owner on Feb 6, 2026. It is now read-only.

Bug: MIDI events not being fired #273

@batata004

Description

@batata004

Hi,

I am using the code below, exactly as suggested in the documentation and example. When I press keys on my midi keyboard they are not being recognized by the library (I created the event using addListener as suggested in the docs but it never fires. Is this a bug or am I doing something wrong?

<!DOCTYPE html>
<html xmlns = "http://www.w3.org/1999/xhtml">
<head>
	<meta http-equiv="content-type" content="text/html; charset=utf-8" />
	<!-- polyfill -->
	<script src="../inc/shim/Base64.js" type="text/javascript"></script>
	<script src="../inc/shim/Base64binary.js" type="text/javascript"></script>
	<script src="../inc/shim/WebAudioAPI.js" type="text/javascript"></script>
	<!-- midi.js package -->
	<script src="../js/midi/audioDetect.js" type="text/javascript"></script>
	<script src="../js/midi/gm.js" type="text/javascript"></script>
	<script src="../js/midi/loader.js" type="text/javascript"></script>
	<script src="../js/midi/plugin.audiotag.js" type="text/javascript"></script>
	<script src="../js/midi/plugin.webaudio.js" type="text/javascript"></script>
	<script src="../js/midi/plugin.webmidi.js" type="text/javascript"></script>
	<script src="../js/midi/player.js" type="text/javascript"></script>
	<!-- utils -->
	<script src="../js/util/dom_request_xhr.js" type="text/javascript"></script>
	<script src="../js/util/dom_request_script.js" type="text/javascript"></script>
</head>
<body>
<script type="text/javascript">

window.onclick = function () {
	MIDI.loadPlugin({
		soundfontUrl: "./soundfont/",
		instrument: "acoustic_grand_piano",
		onprogress: function(state, progress) {
			console.log(state, progress);
		},
		onsuccess: function() {

	            MIDI.Player.removeListener(); // removes current listener.
	            MIDI.Player.addListener(function(data) { // set it to your own function!
		            var now = data.now; // where we are now
		            var end = data.end; // time when song ends
		            var channel = data.channel; // channel note is playing on
		            var message = data.message; // 128 is noteOff, 144 is noteOn
		            var note = data.note; // the note
		            var velocity = data.velocity; // the velocity of the note
		            // then do whatever you want with the information!
		            
		             $("body").append('<div>' + note + '|' + velocity + '</div>');
		            
	            });


		}
	});
		
	

};

</script>
</body>
</html>

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