MIDIAccess: statechange 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 statechange event of the MIDIAccess interface is fired when a new MIDI port is added or when an existing port changes state.
Syntax
Use the event name in methods like addEventListener(), or set an event handler property.
js
addEventListener("statechange", (event) => { })
onstatechange = (event) => { }
Event type
A MIDIConnectionEvent. Inherits from Event.
Event properties
MIDIConnectionEvent.portRead only-
Returns a reference to a
MIDIPortinstance for a port that has been connected or disconnected.
Example
The Navigator.requestMIDIAccess() method returns a promise that resolves with a MIDIAccess object. When a port changes state, information about that port is printed to the console.
js
navigator.requestMIDIAccess().then((access) => {
access.onstatechange = (event) => {
console.log(event.port.name, event.port.manufacturer, event.port.state);
};
});
Specifications
| Specification |
|---|
| Web MIDI API # dom-midiaccess-onstatechange |
Browser compatibility
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