Question

我试图实现一个简单的角度路线

const appRoutes: Routes = [
   { path: ''        ,redirectTo: '/recipes', pathMatch: 'full'},
   { path: 'recipes'              , component: RecipesComponent},
   { path: 'recipes/:recipeName'  , component: RecipesComponent},
];

在一些生成列表的组件中，我有一个单击a的功能更新状态变量和路由，虽然我也在初始化时发生了抓取机制订阅。

  ngOnInit() {
    this.route.params
      .subscribe(
        (params: {Params}) => {

          this.selectedRecipe = this.findRecipeByName(params['recipeName']);  
        });
  }


   navRecipe(recipeName: string): void {
      let path = '/recipes/' + recipeName;
      this.selectedRecipe = this.findRecipeByName(recipeName);
      this.router.navigate([path]);
   }

但是当我尝试点击一个重新路由到带参数的组件的链接时，我得到以下内容：

core.js:1350 ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence
EmptyError: no elements in sequence
    at new EmptyError (EmptyError.js:28)
    at FirstSubscriber._complete (first.js:154)
    at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
    at MergeMapSubscriber._complete (mergeMap.js:150)
    at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
    at MapSubscriber.Subscriber._complete (Subscriber.js:140)
    at MapSubscriber.Subscriber.complete (Subscriber.js:122)
    at EmptyObservable._subscribe (EmptyObservable.js:83)
    at EmptyObservable.Observable._trySubscribe (Observable.js:172)
    at EmptyObservable.Observable.subscribe (Observable.js:160)
    at new EmptyError (EmptyError.js:28)
    at FirstSubscriber._complete (first.js:154)
    at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
    at MergeMapSubscriber._complete (mergeMap.js:150)
    at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
    at MapSubscriber.Subscriber._complete (Subscriber.js:140)
    at MapSubscriber.Subscriber.complete (Subscriber.js:122)
    at EmptyObservable._subscribe (EmptyObservable.js:83)
    at EmptyObservable.Observable._trySubscribe (Observable.js:172)
    at EmptyObservable.Observable.subscribe (Observable.js:160)
    at resolvePromise (zone.js:824)
    at resolvePromise (zone.js:795)
    at eval (zone.js:873)
    at ZoneDelegate.invokeTask (zone.js:425)
    at Object.onInvokeTask (core.js:4621)
    at ZoneDelegate.invokeTask (zone.js:424)
    at Zone.runTask (zone.js:192)
    at drainMicroTaskQueue (zone.js:602)
    at ZoneTask.invokeTask [as invoke] (zone.js:503)
    at invokeTask (zone.js:1540)

Answer 1

我在Angular v 4.4.6中遇到了同样的错误。我找到了两种解决错误的替代解决方案。一个是为每个路由定义添加pathMatch: 'full'。另一个是将rxjs降级到v5.5.3以下。如果一个人不适合你，也许另一个人会。

更新：似乎问题已在rxjs v5.5.5中修复。在使用Angular 5.0.5的项目中，将rxjs升级到v5.5.5后，错误停止发生。

Answer 2

Angular最新版本错误。将pathMatch: 'full'添加到所有路由。

 {
    path: '',
    component: HomeComponent,
    pathMatch: 'full'
  },
  {
   path: 'about',
   component: AboutComponent,
   pathMatch: 'full'
  },

Answer 3

我在Angular 5.0.1和rxjs 5.5.3中遇到了同样的错误。当我们更改routes数组中的顺序时，我们没有遇到异常。所以对你的例子来说：

const appRoutes: Routes = [
    { path: '',                    redirectTo: '/recipes', pathMatch: 'full'},
    { path: 'recipes/:recipeName', component: RecipesComponent},
    { path: 'recipes',             component: RecipesComponent},
];

在一般路径（recipes/:recipeName）之前放置更详细的路径（recipes）。

如何调试未捕获的（在promise中）：EmptyError：没有由router.navigate引起的顺序元素？

3 个答案: