ng model on change

<select [(ngModel)]="selectedItem" #item (change)="onChange(item.value)">

<select [(ngModel)]="selectedItem" (ngModelChange)="onChange($event)">

onChange(newValue) {
    console.log(newValue);
    this.selectedItem = newValue;  // don't forget to update the model here
    // ... do other stuff here ...
}

<select [ngModel]="selectedItem" (ngModelChange)="onChange($event)">