MIDIAccess - Web APIs 编辑

Experimental

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

The MIDIAccess interface of the Web MIDI API provides methods for listing MIDI input and output devices, and obtaining access to those devices.

Properties

MIDIAccess.inputs Read only

Returns an instance of MIDIInputMap which provides access to any available MIDI input ports.

MIDIAccess.outputs Read only

Returns an instance of MIDIOutputMap which provides access to any available MIDI output ports.

MIDIAccess.sysexEnabled Read only

A boolean attribute indicating whether system exclusive support is enabled on the current MIDIAccess instance.

Event Handlers

MIDIAccess.onstatechange

Called whenever a new MIDI port is added or an existing port changes state.

Examples

navigator.requestMIDIAccess()
  .then(function(access) {

     // Get lists of available MIDI controllers
     const inputs = access.inputs.values();
     const outputs = access.outputs.values();

     access.onstatechange = function(e) {

       // Print information about the (dis)connected MIDI controller
       console.log(e.port.name, e.port.manufacturer, e.port.state);
     };
  });

Specifications

Browser compatibility

BCD tables only load in the browser