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.

Syntax

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

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

ondisconnect = (event) => {};

Event type

Event properties

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

device Read only

The USBDevice the event is fired for.

Examples

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

js
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:

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

Specifications

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

Browser compatibility

BCD tables only load in the browser