gistfile1.js

const DBus = imports.dbus;

const NotificationRemoteInterface = {
    name: 'org.freedesktop.Notifications', //interface name
    methods: [
        {    //method name and signature
            name: 'Notify',
            inSignature: 'susssasa{sv}i',
            outSignature: 'u'
        }
    ]
};

let NotificationProxy = DBus.makeProxyClass(NotificationRemoteInterface);

let notification_proxy = new NotificationProxy(DBus.session,
                                                    'org.freedesktop.Notifications',
                                                    '/org/freedesktop/Notifications');

const Gtk = imports.gi.Gtk;
Gtk.init (null, null);

let builder = new Gtk.Builder ();
builder.add_from_file ("test.glade")

let errlog = builder.get_object ("textview_log");

let test =1;

builder.get_object("window1").connect ("destroy", function () {
        Gtk.main_quit();
});

builder.get_object("button1").connect("clicked", function () {

	let textArea = builder.get_object("textview1");
	let buffer = textArea.get_buffer();
	let start = buffer.get_start_iter();
	let end = buffer.get_end_iter();
	let text = buffer.get_text(start, end, false);
	
	 notification_proxy.NotifyRemote('my_app_sample' + test,    //these are the params of the method called
                                    10,
                                    'dialog-info',
                                    'Summary of the notification',
                                    text,
                                    [],
                                    {},
                                    10,
                                    function(result, err){
                                        log('This is the result: ' + result);
                                        log('This is the error: ' + err);
    	let test = test + 1;
    });

});

Gtk.main ();