如何調試未被捕獲（在promise中）：EmptyError：由router.navigate引起的序列中沒有元素？

我想實現生成列表中的一些成分簡單的角度路線如何調試未被捕獲（在promise中）：EmptyError：由router.navigate引起的序列中沒有元素？

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

，我有一個更新點擊狀態變量和路徑的功能，雖然我也有提取機制，用戶發生在初始化。

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，當我嘗試單擊重新路由到組件與參數，我得到以下的鏈接：

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)

來源

2017-12-03 Iancovici

我遇到了與Angular v 4.4.6相同的錯誤。我發現有兩種解決方案可以解決這個錯誤。一個是將pathMatch: 'full'添加到每個路由定義。另一個是將rxjs降低到v5.5.3以下。如果一個人不適合你，也許另一個人會。

更新：它出現的問題已被固定在rxjs v5.5.5。在使用Angular 5.0.5的項目中，將rxjs升級到v5.5.5後，錯誤停止發生。

來源

2017-12-03 06:26:08 EvanMorrison

這適用於我。謝謝埃文，謝謝你發佈！ – bevada

Thanks..changed「rxjs」：「^ 5.1.0」到「rxjs」：「5.5.2」現在工作 – prash

添加pathMatch：'full'也適用於我！ –

角最新版本的bug。將pathMatch: 'full'添加到所有路線。

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

來源

2017-12-03 05:51:40

你可以添加一個版本號和來源？ – Mick

我只有一條路由失敗 - 所以我試着只加入pathMatch：'full'到那條路由 - 不起作用。真的需要將其添加到每條路線。 –

我遇到了與Angular 5.0.1和rxjs 5.5.3相同的錯誤。我們在更改routes數組中的順序時沒有遇到異常。因此，對於你的例子：

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

一般路徑（recipes）之前把更詳細的路徑（recipes/:recipeName）。

來源

2017-12-05 11:38:17 Daxez

如何調試未被捕獲（在promise中）：EmptyError：由router.navigate引起的序列中沒有元素？

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