W3cubDocs

/Web APIs

MIDIInput: midimessage event

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The midimessage event of the Web MIDI API is fired when the MIDI port corresponding to this MIDIInput finishes receiving one or more MIDI messages. An instance of MIDIMessageEvent containing the message that was received is passed to the event handler.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js

addEventListener("midimessage", (event) => {});

onmidimessage = (event) => {};

Event type

Event properties

This interface also inherits properties from Event.

MIDIMessageEvent.data

A Uint8Array containing the data bytes of a single MIDI message. See the MIDI specification for more information on its form.

Examples

In the following example midimessage events are listened for on all input ports. When a message is received the MIDIMessageEvent.data property is printed to the console.

js

inputs.forEach((input) => {
  input.onmidimessage = (message) => {
    console.log(message.data);
  };
});

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
midimessage_event 43 79 108 No 30 No No 43 No 30 No 4.0

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/MIDIInput/midimessage_event