Web/API/MIDIMessageEvent

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The MIDIMessageEvent interface of the Web MIDI API represents the event passed to the onmidimessage event handler of the MIDIInput interface. A midimessage event is fired every time a MIDI message is sent from a device represented by a MIDIInput, for example when a MIDI keyboard key is pressed, a knob is tweaked, or a slider is moved.  

Constructor

MIDIMessageEvent.MIDIMessageEvent

Creates a new MIDIMessageEvent object instance.

Properties

MIDIConnectionEvent.data

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

Note: Even though the Web MIDI API specifies a receivedTime property that returns a DOMHighResTimeStamp, Chrome (the only implementation at the time of writing) does not support that property since the basic Event.timeStamp property already returns a DOMHighResTimeStamp in Chrome.

Examples

// Printing all messages to console
navigator.requestMIDIAccess().then(midiAccess => {
  Array.from(midiAccess.inputs).forEach(input => {
    input[1].onmidimessage = (msg) => { console.log(msg); }
  })
});

Specifications

Specification	Status	Comment
Web MIDI APIThe definition of 'MIDIMessageEvent' in that specification.	Working Draft	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
MIDIMessageEvent Experimental'	Chrome Full support 43	Edge Full support ≤79	Firefox ?	IE No support No	Opera Full support 30	Safari No support No	WebView Android No support No	Chrome Android Full support 43	Firefox Android ?	Opera Android Full support 30	Safari iOS No support No	Samsung Internet Android Full support 4.0
MIDIMessageEvent() constructor Experimental'	Chrome Full support 43	Edge Full support ≤79	Firefox ?	IE No support No	Opera Full support 30	Safari No support No	WebView Android No support No	Chrome Android Full support 43	Firefox Android ?	Opera Android Full support 30	Safari iOS No support No	Samsung Internet Android Full support 4.0
data Experimental'	Chrome Full support 43	Edge Full support ≤79	Firefox ?	IE No support No	Opera Full support 30	Safari No support No	WebView Android No support No	Chrome Android Full support 43	Firefox Android ?	Opera Android Full support 30	Safari iOS No support No	Samsung Internet Android Full support 4.0

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

MIDIMessageEvent by Mozilla Contributors is licensed under CC-BY-SA 2.5.