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midimonitor.html
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<!DOCTYPE html>
<html>
<head>
<title>MIDI Monitor</title>
<script src="./thirdparty/webmidi3.js"></script>
<style>
body {
font-family: sans-serif;
padding: 20px;
background: #1a1a1a;
color: #ffffff;
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
margin: 0;
}
#midiDisplay {
border: 1px solid #333;
padding: 20px;
border-radius: 8px;
background: #242424;
min-width: 300px;
text-align: center;
}
#midiDisplay > div {
margin: 15px 0;
font-size: 1.2em;
}
.active {
background: #2d5d2d;
padding: 5px 10px;
border-radius: 4px;
display: inline-block;
}
.inactive {
background: #5d2d2d;
padding: 5px 10px;
border-radius: 4px;
display: inline-block;
}
@keyframes flash {
0% { transform: scale(1); }
50% { transform: scale(1.1); }
100% { transform: scale(1); }
}
.flash {
animation: flash 0.2s ease;
}
#lastEvent {
display: inline-block;
}
</style>
</head>
<body>
<div id="midiDisplay">
<div>Device: <span id="deviceName">No device</span></div>
<div>Last Event: <span id="lastEvent">None</span></div>
<div>Note Status: <span id="noteStatus" class="inactive">OFF</span></div>
</div>
<script>
WebMidi.enable(function (err) {
if (err) {
console.log("WebMidi could not be enabled.", err);
return;
}
const deviceName = document.getElementById("deviceName");
const lastEvent = document.getElementById("lastEvent");
const noteStatus = document.getElementById("noteStatus");
let activeNotes = new Set();
function flashElement(element) {
element.classList.add('flash');
setTimeout(() => element.classList.remove('flash'), 200);
}
function updateNoteStatus() {
if (activeNotes.size > 0) {
noteStatus.textContent = "ON";
noteStatus.className = "active";
} else {
noteStatus.textContent = "OFF";
noteStatus.className = "inactive";
}
}
WebMidi.inputs.forEach((input, index) => {
deviceName.textContent = input.name || `MIDI Device #${index + 1}`;
input.addListener('noteon', "all", e => {
activeNotes.add(`${e.note.name}${e.note.octave}`);
lastEvent.textContent = `Note ON: ${e.note.name}${e.note.octave} (${e.note.number})`;
flashElement(lastEvent);
updateNoteStatus();
});
input.addListener('noteoff', "all", e => {
activeNotes.delete(`${e.note.name}${e.note.octave}`);
lastEvent.textContent = `Note OFF: ${e.note.name}${e.note.octave} (${e.note.number})`;
flashElement(lastEvent);
updateNoteStatus();
});
input.addListener('controlchange', "all", e => {
lastEvent.textContent = `CC: ${e.controller.number} = ${e.value}`;
flashElement(lastEvent);
});
input.addListener('pitchbend', "all", e => {
lastEvent.textContent = `Pitch Bend: ${e.value}`;
flashElement(lastEvent);
});
});
WebMidi.addListener("connected", e => {
deviceName.textContent = e.port.name || `MIDI Device #${WebMidi.inputs.indexOf(e.port) + 1}`;
});
WebMidi.addListener("disconnected", e => {
if (WebMidi.inputs.length === 0) {
deviceName.textContent = "No device";
lastEvent.textContent = "None";
activeNotes.clear();
updateNoteStatus();
}
});
});
</script>
</body>
</html>