NodeBB/public/src/forum/admin/index.js

(function() {

	ajaxify.register_events(['api:get_all_rooms']);
	socket.on('api:get_all_rooms', function(data) {

		var active_users = document.getElementById('active_users'),
			total = 0;
			active_users.innerHTML = '';

		for (var room in data) {
			if (room !== '') {
				var count = data[room].length;
				total += count;
				active_users.innerHTML = active_users.innerHTML + "<div class='alert alert-success'><strong>" + room + "</strong> " + count + " active user" + (count > 1 ? "s" : "") + "</div>";
			}
		}

		document.getElementById('connections').innerHTML = total;
	});

	app.enter_room('admin');
	socket.emit('api:get_all_rooms');

}());