Angular 6 routerLink on a new tab

Here’s an alternate way of doing within a component.

openCityInNewWindow(city) {
  // Converts the route into a string that can be used 
  // with the window.open() function
  const url = this.router.serializeUrl(
    this.router.createUrlTree([`/custompage/${city.id}`])
  );

  window.open(url, '_blank');
}

Html will look something like

<ul *ngFor="let city of cities">
  <li (click)="openCityInNewWindow(city.id)">{{city.name}}</li>
</ul>