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.
Note: This feature is available in Web Workers.
The disconnect event of the USB interface is fired whenever a paired device is disconnected.
Syntax
Use the event name in addEventListener():
addEventListener("disconnect", (event) => { })
Alternatively, assign to the event handler property of the interface:
ondisconnect = (event) => { }
Event type
A USBConnectionEvent. Inherits from Event.
Examples
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.ondisconnect event handler property to establish a handler for the disconnect event (but note that this replaces other event listeners added using ondisconnect, if any):
navigator.usb.ondisconnect = (event) => {
// Remove event.device from the UI.
};
Specifications
| Specification |
|---|
| WebUSB # disconnect |
| WebUSB # dom-usb-ondisconnect |