Check DistanceWidget's marker dragend - google-maps

Question

DistanceWidget:
function DistanceWidget(map,markers) {
this.set('map', map);
this.set('position', map.getCenter());
this.set('markers',markers);
// MARKER CENTER
var marker = new google.maps.Marker({
draggable: true,
icon: {
url: "/public/img/move.png",
size: new google.maps.Size(20, 20),
anchor: new google.maps.Point(10, 10)
},
title: 'Di chuyển'
});
marker.bindTo('map', this);
marker.bindTo('position', this);
var me = this;
var radiusWidget = new RadiusWidget(markers);
this.bindTo('circle', radiusWidget);
radiusWidget.bindTo('map', this);
radiusWidget.bindTo('markers', this);
radiusWidget.bindTo('center', this, 'position');
this.bindTo('distance', radiusWidget);
this.bindTo('bounds', radiusWidget);
this.bindTo('radius', radiusWidget);
}
RadiusWidget:
RadiusWidget.prototype.center_changed = function() {
var bounds = this.get('bounds');
if (bounds) {
var lng = bounds.getNorthEast().lng();
var position = new google.maps.LatLng(this.get('center').lat(), lng);
this.set('sizer_position', position);
}
};
RadiusWidget.prototype.checkCenterDragend = function(){
//TODO SOMETHING HERE
}
I move (drag) MARKER CENTER in DistanceWidget, center_changed prototype will update. That's great.
Question: How can I check event dragend of MARKER CENTER to update something in checkCenterDragend prototype.
Thank for your time.

Answer 1

Simply call the method in the dragend-handler:
place this after the line var radiusWidget = new RadiusWidget(markers);
google.maps.event.addListener(marker, 'dragend', function() {
radiusWidget.checkCenterDragend.call(radiusWidget,this.getPosition());
});
The first argument passed to the function will be the marker-position(the center)