Detecting web bluetooth disconnection

If a puck disconnects from my browser due to the connection dropping out (e.g. it moves out of range) is there a way to detect this on the web front end? I can see that puck.js creates the following console log:
Disconnected (gattserverdisconnected)

I’m using the following code snippet to create a 2-way connection as per one of your site tutorials. This includes the part about resetting the puck on disconnection, which seems to work fine on the puck - I just want to be able to reset the browser too.

Puck.connect(function(connection) { 
	connection.on("data", function(d) { 
		// handle receiving data 
	} 
	connection.write("reset();\n", function() { 
		setTimeout(function(){ 
			// do various stuff here 
			// reset on disconnect 
			connection.write("NRF.on('disconnect',function(){ reset(); });\n",function(){}); 
		},1500); 
	}); 
	// I'm hoping there's a way to detect disconnection here 
	// e.g. connection.on("disconnect", function(){}); 
}); 

Thanks!

Looking at the libray I think connection.on('close', function() { ... }); would do it...

Thanks, that seems to do the job!
Might be worth noting, though, that it doesn't appear to work every time - sometimes the connection can drop out, and no close event is fired. When this happens, the "Disconnected (gattserverdisconnected)" log does not appear in the console from puck.js either.

Ok, thanks - does any other message about disconnection appear that might mean the library is at all aware the connection has dropped out? You can set Puck.debug=3; to help with extra logging info.