import 'package:mdl/mdl.dart'; main() { registerMdl(); componentFactory().run().then((_) { final MaterialSlider slider2 = MaterialSlider.widget(dom.querySelector("#slider2")); final MaterialSlider slider4 = MaterialSlider.widget(dom.querySelector("#slider4")); slider2.hub.onChange.listen((_) { slider4.value = slider2.value; }); }); }