Error in Angular6: Why can't handleError read injected services?

It appears that I am facing an issue where I cannot access a service injected inside the handleError function.

constructor(private http: HttpClient, public _translate: TranslateService) { }        
login(user: User): Observable<User> {               
      console.log( this._translate); // The service is accessible here    
      return this.http.post<User>("http://...../login",  params, httpOptions)
            .pipe(catchError(this.handleError));                  
}

private handleError(error: HttpErrorResponse) {    
      console.log( this._translate); // However, the service is not accessible here                           
      return throwError(error.error);                     
};

Answer №1

When passing an unbound function as an argument in

.pipe(catchError(this.handleError));
, you are losing the context.

It is recommended to either use:

  .pipe(catchError(this.handleError.bind(this)));

or utilize an arrow function:

       .pipe(catchError((err) => this.handleError(err)));    

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

Utilize Angular2 to dynamically add new routes based on an array register

Currently, I am utilizing Angular2 for the frontend of my project and I am faced with the task of registering new Routes from an array. Within my application, there is a service that retrieves data from a server. This data is then stored in a variable wit ...

Template URI parameters are being used in a router call

Utilizing the useRouter hook in my current project. Incorporating templated pages throughout the application. Implementing a useEffect hook that responds to changes in the router and makes an API call. Attempting to forward the entire URL to /api/${path ...

Is there a tool that can automatically arrange and resolve TypeScript dependencies, with or without the use of _references.ts file?

Currently, I am working on understanding the new workflow for "_references.ts" and I feel like there is something missing when it comes to using multiple files without external modules in order to produce correctly ordered ".js" code. To start with, I took ...

The table is failing to display the values contained within the array

My users list is successfully retrieved from the API and I can see the data in my console. However, when I attempt to map it and display it as a table, it doesn't seem to work as expected. This is the component I'm working with: interface IUser { ...

Can two Angular element components be utilized simultaneously on a single page in Angular 6?

Currently, I'm attempting to host independent Angular elements that can be seamlessly integrated into a non-Angular webpage. Everything works perfectly fine when there's only one element on the page, but as soon as I try to load two or more, I en ...

Having trouble changing file names in a Next.js 13 project

I've been facing an issue ever since Next.Js 13 updated the `pages` folder to a new `app` folder. Whenever I try to rename the default "Pages.tsx" file to something like "Home.tsx" or "Information.tsx", it breaks and shows a 404 Page error. The first ...

Update each number in an array by appending a string within a table in an Angular component, rather than the

I have created a function that decides on a comment based on the result number added to an array and displays it in a table. However, calling this function within the template is causing a performance slowdown. Is there a way to achieve the same outcome w ...

Learn the process of setting up a connection between Express JS and the NotionAPI using both POST and

As someone who is new to backend development, I am currently working on integrating a simple Notion form into a Typescript website. To guide me through the process, I found a helpful tutorial at . The tutorial demonstrates how to send data from localhost:3 ...

Holding an element in TypeScript Angular2 proved to be challenging due to an error encountered during the process

I attempted to access a div element in my HTML using ElementRef, document, and $('#ID') but unfortunately, it did not work. I tried implementing this in ngOnInit, ngAfterViewInit, and even in my constructor. Another method I tried was using @Vie ...

Expanding User Type to Include Extra User Data Using NextAuth.js

I encountered a dilemma where I needed to include the "profile" property in my section object to cater to different user personas in my application. However, despite retrieving the logged-in user's data from the backend and storing it in the NextAuth. ...

What sets typescript apart when using a getter versus a regular function?

Imagine having a class with two methods declared for exclusive use within that class. // 1. private get something() { return 0; } // 2. private getSomething() { return 0; } While I am familiar with getters and setters, I'm intrigued to know if ther ...

Schedule - the information list is not visible on the calendar

I am trying to create a timeline that loads all data and events from a datasource. I have been using a dev extreme component for this purpose, but unfortunately, the events are not displaying on the calendar. Can anyone offer any insights into what I might ...

How can we update a boolean value in an Angular service using a set function?

Hey there! I'm currently working on updating a boolean value in my service when a button is clicked within my component. My goal is to trigger the setfunction and toggle the boolean value from true to false, and vice versa when the button is clicked a ...

Utilizing TypeScript path aliases in a Create React App project with TypeScript and ESLint: A step-by-step guide

I utilized a template project found at https://github.com/kristijorgji/cra-ts-storybook-styled-components and made some enhancements. package.json has been updated as follows: { "name": "test", "version": "0.1.0" ...

Performing bulk operations on all selected rows in a table using Angular 6

Within my Angular 6 web application, there is a table with checkboxes in each row. My goal is to be able to perform bulk actions on the selected rows, such as deleting them. One approach I considered was adding an isSelected boolean property to the data m ...

How to utilize *ngFor alongside the async pipe for conditional rendering in Angular 8 HTML

.html <ng-container *ngFor="let contact of listContact | async; let index = index;"> <h6 class="title" *ngIf="contact && contact['type']"> {{contact['type']}} </h6> <div> {{conta ...

Yes, indeed - Entering the schema of a retrieved field from an Object schema

After deciding to upgrade from Yup version 0.29 to 1.2, I encountered some challenges with its types. Seeking assistance in finding the best solution for typing yup schemas. In version 0.29, the universal type Schema fit everywhere, but now it no longer d ...

Encountering a getStaticProps error while using Typescript with Next.js

I encountered an issue with the following code snippet: export const getStaticProps: GetStaticProps<HomeProps> = async () => { const firstCategory = 0; const { data }: AxiosResponse<MenuItem[]> = await axios.post( ...

Exploring the Angular Heroes Journey: What's the significance of one being labeled with a colon while the other is identified

Setting: Angular 5+ Source: https://angular.io/tutorial Within the heroes.component.ts class, we see an assignment using a colon: export class HeroesComponent implements OnInit { heroes: Hero[]; However, in the app.component.ts class, a different as ...

What sets Import apart from require in TypeScript?

I've been grappling with the nuances between import and require when it comes to using classes/modules from other files. The confusion arises when I try to use require('./config.json') and it works, but import config from './config.json ...