Angular 2 calling jQuery after rendering elements – after consuming API

This should work for you:

@ViewChild('select') selectRef: ElementRef;
constructor(private myService: MyService, private ngZone: NgZone) {}

ngOnInit() {
  this.myService.getAll().subscribe(data => {
    this.options = data;
    // waiting until select options are rendered
    this.ngZone.onMicrotaskEmpty.first().subscribe(() => {
      $(this.selectRef.nativeElement).select2(); 
    });
  });
}

Plunker Example