lazyload1.directive.ts

export class LazyLoadDirective implements AfterViewInit, OnDestroy {

  public ngAfterViewInit() {
    if (this._service.delayMsec > 0) { // register later
      const sub = this._service.announcedOrder.pipe(first()).subscribe(_ => this.doRegister());
      this._subscription.add(sub);
    } else { // register now (default)
      this.doRegister();
    }
  }