USB: disconnect event

Limited availability

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

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

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

The disconnect event of the USB interface is fired whenever a paired device is disconnected.

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

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

ondisconnect = (event) => {};

In addition to the properties listed below, properties from the parent interface, Event, are available.

Once a USB device is disconnected, you might want to update the UI.

navigator.usb.addEventListener("disconnect", (event) => {
  // Remove event.device from the UI.
});

Alternatively, you can use the USB.ondiscconnect event handler property to establish a handler for the disconnect event:

navigator.usb.ondisconnect = (event) => {
  // Remove event.device from the UI.
};

Specification
WebUSB API # disconnect
WebUSB API # ref-for-dom-usb-ondisconnect

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