javascript - Angular 9：forkJoin 订阅不起作用

Question

我正在尝试使用 observables（rxjs 6.5.1）在 Angular 9 中的顶级组件上加载页面数据。当我单独订阅这些服务时，我可以看到数据恢复得很好：

ngOnInit(): void {
  const technicianSubscription = this.techniciansClientService.getByTechnicianId(this.technicianId).subscribe(technician => console.log(technician));
  const technicianReviewsSubscription = this.technicianReviewsClientService.getByTechnicianId(this.technicianId).subscribe(technicianReviews => console.log(technicianReviews));
}

当我尝试使用 forkJoin 时，来自 subscribe 方法的数据永远不会返回：

ngOnInit(): void {
  this.pageDataSubscription = forkJoin({
    technician: this.techniciansClientService.getByTechnicianId(this.technicianId),
    technicianReviews: this.technicianReviewsClientService.getByTechnicianId(this.technicianId),
  }).subscribe(
    // data is never logged here
    data => console.log(data)
  );
}

我尝试向 forkJoin 传递一系列服务调用，并且我也尝试过使用 zip，但无济于事。这里发生了什么事？

标签： javascriptangularrxjsobservableangular9

Answer 1

我建议使用combineLatestfrom rxjs。它更易于使用

import {combineLatest} from `rxjs`;

componentIsActive = true;
ngOnInit(): void {
  combineLatest([
    this.techniciansClientService.getByTechnicianId(this.technicianId),
    this.technicianReviewsClientService.getByTechnicianId(this.technicianId),
  ]).pipe(
    map(([technician, technicianReviews]) => ({technician, technicianReviews})),
    takeWhile(() => this.componentIsActive)
  ).subscribe(data => console.log(data));
}