rxjs-observables

来源： https://stackoverflow.com/questions/62254252/angular-observables-never-come-to-completion-handler

来源： https://stackoverflow.com/questions/62254252/angular-observables-never-come-to-completion-handler

来源： https://stackoverflow.com/questions/63386585/how-to-pass-results-between-chained-observables

来源： https://stackoverflow.com/questions/63065824/submit-the-form-with-validation-error-using-formarray

问题 I have a user service which allows login, logout and maintains data about the currently logged in user: user$ = this.http.get<User>('/api/user') .pipe( shareReplay(1), ); I am using shareReplay(1) because I do not want the webservice to be called several times. On one of the components, I have this (for simplicity), but I have several other things I want to do if a user is logged in: <div *ngIf="isUserLoggedIn$ | async">Logout</div> isUserLoggedIn$ = this.userService.user$ .pipe( map(user =>

问题 This question already has an answer here : Template binding with function return Observable and async pipe (1 answer) Closed 13 days ago . Note I have created a simplified version of this question at Template binding with function return Observable and async pipe Template: <div *ngIf="entity?.ext.insuredDetails.insuredType$() | async as insuredType"> {{insuredType}} </div> insuredType$ definition: @NeedsElement(sp(115621),ap(116215)) insuredType$(): Observable<string> { return empty(); }

问题 Note this is simplified question of Angular template binding with Observable async pipe issue template: <div>{{foo()$ | async}}</div> source code: import { Component } from "@angular/core"; import { BehaviorSubject, of, Observable } from "rxjs"; import { tap, delay, map, switchMap, concatMap } from "rxjs/operators"; @Component({ selector: "my-app", templateUrl: "./app.component.html", styleUrls: ["./app.component.css"] }) export class AppComponent { private index = 0; foo$(): Observable<any>