Bluetooth: availabilitychanged event

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

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

The availabilitychanged event fires when the Bluetooth system as a whole becomes available or unavailable to the User Agent.

Syntax

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

addEventListener('availabilitychanged', event => { });

onavailabilitychanged = event => { };

A generic Event.

To be informed when Bluetooth availability changes, you can add a handler to your Bluetooth instance using addEventListener(), like this:

Bluetooth.addEventListener("availabilitychanged", function(event) {
  var availability = event.value;
});

Alternatively, you can use the Bluetooth.onavailabilitychanged event handler property to establish a handler for the availabilitychanged event:

Bluetooth.onavailabilitychanged = function(event) {
 var availability = event.value;
}

Specification
Web Bluetooth # eventdef-bluetooth-availabilitychanged
Web Bluetooth # dom-bluetooth-onavailabilitychanged

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`availabilitychanged_event`	56	79	No	No	43	No	No	56	No	43	No	6.0