MIDIInput: midimessage event

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

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

Specification
Web MIDI API
# dom-midiinput-onmidimessage

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
midimessage event

Legend

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Full support
Full support
No support
No support
See implementation notes.