Questions tagged [rxjs6]

RxJS6, also known as Reactive Extensions for JavaScript version 6, brings a myriad of exciting updates including enhancements to websockets, improved testing capabilities, and fixes for troublesome bugs.

Subscribing to Observables in Angular Services: How Using them with ngOnChanges Can Trigger Excessive Callbacks

Consider the following scenario (simplified): Main Component List Component List Service Here is how they are connected: Main Component <my-list [month]="month"></my-list> List Component HTML <li *ngFor="let item in list | async>&l ...

What is the solution to the error message stating that the property 'pipe' is not found on the OperatorFunction type?

I implemented the code based on RxJS 6 documentation while working with angular 5, RxJS 6 and angularfire2 rc.10. However, I encountered the following error: [ts] property 'pipe' does not exist on type 'OperatorFunction<{}, [{}, user, str ...

Angular's HttpClient enables you to easily map an object to an array of properties

I have a scenario where I am calling an API that returns a JSON Object, and my task is to map this object to an array. Despite having the following code, I am not receiving any response or error after making the API call. export class Features { MenuId ...

Encountering Compilation Error When Using RxJS Observable with Angular 6 and Swagger Codegen

Encountering TypeScript compiler errors related to rxjs while working with Angular 6 and Swagger Codegen: Cannot find module 'rxjs-compat/Observable' Referenced the following link for assistance: https://github.com/ReactiveX/rxjs/blob/master/MIGRATION.m ...

Dispatch a websocket communication from a synchronous function and retrieve the information within the function itself

I am currently working on an Angular project and need guidance on the most effective approach to implement the following. The requirement is: To retrieve an image from the cache if available, otherwise fetch it from a web socket server. I have managed ...

Update an API call to switch from promises to observables, implementing axios

Recently, I have been experimenting with using rxjs for API requests in a React application and this is the approach that I have come up with. What are your thoughts on this method? Are there any best practices that you would recommend following? If you ...

Exploring the usage of array map parameters in rxjs 6 when combined with withLatestFrom

Prior to Rxjs 6, we were able to achieve the following: interface TypeA { payload: any; } source$.pipe( withLatestFrom(source2$, (source1: TypeA, source2: TypeB) => ({ payload: source1.payload, source2 }) ), ) In the resultSelector method ...

What is the correct way to initialize and assign an observable in Angular using AngularFire2?

Currently utilizing Angular 6 along with Rxjs 6. A certain piece of code continuously throws undefined at the ListFormsComponent, until it finally displays the data once the Observable is assigned by calling the getForms() method. The execution of getForm ...

Using the map operator in an Angular 7 application with rxjs

Despite successfully compiling my code and having everything work perfectly, I encountered an error message in my IDE (Visual Studio Code) that is preventing me from deploying my app using ng build --prod: ERROR in src/app/training/training.service.ts(6 ...

Extract the values from HTTP GET request by Id (Observable) and assign them to variables within the component

Hello everyone, it's been a while since I posted on here. Thank you all for your help so far, but I'm facing some difficulties with my Angular+2 web app. I have a User component and a user.service.ts that handles HTTP requests to get user data in ...

Unusual behavior of takeUntil observed in rxjs version 6

First, press the start button to begin. Then, click on the restore01 button and the restore02 button to restore the start button, The issue arises when clicking on stop button01 or stop button02. The stop button should stop, but it doesn't. Upon che ...

Error encountered following the upgrade of Angular and RxJS 5 to 6: Compilation failed

Since updating my libraries to the latest Angular 6 and RxJS 6, I've encountered an issue. I have a RouteService class that functions as a service. It utilizes the HttpClient to fetch data from a remote API. However, after the update, I'm facing ...

Is it possible that overwriting my observable variable will terminate existing subscribers?

I am looking for a way to cache an http call and also trigger the cache refresh. My UserService is structured like this: @Injectable() export class UserService { private currentUser$: Observable<User>; constructor(private http: HttpClient) { } ...

Oops! It seems like there was an issue trying to access properties that are undefined while reading 'pipe' in Angular12

I encountered an issue when trying to send an AJAX request, displaying the following error message: ERROR TypeError: Cannot read properties of undefined (reading 'pipe') This error occurred in the ajax-loader.interceptor.ts class export class AjaxLoaderI ...

Executing an observable only when a certain variable is in a specific state at the class level

Is there a way to conditionally return an observable in a clean manner, based on a predefined condition? Let's look at the scenario below: isEditing = false; // <---- Variable defined at class level return this.usersService.fetchInitialCreateDat ...

How can we simultaneously execute multiple HTTP requests in Angular 6 by leveraging the power of forkJoin and ngrx?

Current Situation In the realm of my angular6 application, I find myself juggling three distinct categories: catA, catB, and catC. Each of these categories requires data retrieval from 3 separate APIs. Upon selecting any category, the CategoryDetailsCompo ...

Exploring the power of chaining multiple subscriptions in RxJs 6

I have a project using Angular 6, and I'm currently in the process of upgrading rxjs to version 6. In the previous iteration of my app, there was a specific flow where I needed to make sequential calls to observables: 1. Call an observable 2. Perfor ...

What is the approach to constructing an observable that triggers numerous observables depending on the preceding outcome?

One of my endpoints returns { ids: [1, 2, 3, 45] }, while the other endpoint provides values for a given id like { id: 3, value: 30, active: true }. I am currently attempting to create an observable that will call the first endpoint and then, for each id r ...

The Angular 6 View does not reflect changes made to a variable inside a subscribe block

Why isn't the view reflecting changes when a variable is updated within a subscribe function? Here's my code snippet: example.component.ts testVariable: string; ngOnInit() { this.testVariable = 'foo'; this.someService.someObservable.subscribe( ...