1 click onSelect ngIf this selectedClimber Angular 4 Angular4

Angular 4: The Climber Tutorial (Angular 4, deutsch/german)
Quellen:
playlist for angular 4 :

li *ngFor="let climber of climbers" (click)="onSelect(climber)"

div *ngIf="selectedClimber"
/div

styles: [
`.selected {
background-color: black;
color: yellow;
}