angular model change

1<input type="checkbox"  (ngModelChange)="myModel=$event" [ngModel]="mymodel">

1<select [ngModel]="selectedItem" (ngModelChange)="onChange($event)">
2onChange(newValue) {
3    console.log(newValue);
4    this.selectedItem = newValue;  // don't forget to update the model here
5    // ... do other stuff here ...
6}

1<select [ngModel]="selectedItem" (ngModelChange)="onChange($event)">
2

1<select [(ngModel)]="selectedItem" #item (change)="onChange(item.value)">
2