Detect change of a property

// this won't work with setting attribute of the component in Parent component
// need to set property value via Component
// i.e., this.confirmDialog.opened = true
private _opened: boolean;
get opened(): boolean { return this._opened; }
@Input('opened') set opened(val: boolean) { // to detect changes, needed to add set method
    this._opened = val;
    this.openDialog();
}