The property 'capture' is not found on the data type 'Observable<any>'

Question

The property 'capture' is not found on the data type 'Observable<any>'

The Angular 2 Http service documentation includes a code example showcasing how to fetch data using the getHeroes function.

getHeroes (): Observable<Stuff[]> {
  return this.http.get(this.url)
                  .map(this.extractData)
                  .catch(this.handleError);
}

After cloning the angular2-webpack-starter repository, I implemented the above code myself.

To use Observable, I included the following import statement:

import {Observable} from 'rxjs/Observable';

I assumed that the necessary properties of Observable are also imported as functions like .map function work as expected. Upon checking the changelog for rxjs.beta-6 version, no mention was found regarding the catch method.

javascript angular typescript rxjs

Answer 1

Answer №1

Notice: As of Angular 5.5, this solution is considered outdated. Please refer to Trent's answer below for the updated solution.

=====================

A necessary step is importing the operator:

import 'rxjs/add/operator/catch';

You can also import Observable in this manner:

import {Observable} from 'rxjs/Rx';

However, by doing this, you will be importing all operators.

For further information, please check out the following question:

Angular HTTP GET with TypeScript error http.get(...).map is not a function in [null]

Answer 2

Notice: As of Angular 5.5, this solution is considered outdated. Please refer to Trent's answer below for the updated solution.

=====================

A necessary step is importing the operator:

import 'rxjs/add/operator/catch';

You can also import Observable in this manner:

import {Observable} from 'rxjs/Rx';

However, by doing this, you will be importing all operators.

For further information, please check out the following question:

Angular HTTP GET with TypeScript error http.get(...).map is not a function in [null]

Answer 3

Answer №2

With the latest version of RxJS, which is 5.5+, the catch operator has been marked as deprecated. It is now recommended to use the catchError operator along with the pipe method.

In Angular 5, the default dependency version for RxJS is v5.5.2.

When importing any RxJS Operator, including catchError, make sure to import from 'rxjs/operators' and utilize the pipe operator.

An Example showing error handling for an Http request Observable:

import { Observable } from 'rxjs';
import { catchError } from 'rxjs/operators';
...

export class ExampleClass {
  constructor(private http: HttpClient) {
    this.http.request(method, url, options).pipe(
      catchError((err: HttpErrorResponse) => {
        // Handle error here
      }
    )
  }
  ...
}

Note that catch is now replaced by catchError and the pipe operator is used to compose operators similarly to dot-chaining.

For more information on pipable (formerly known as lettable) operators in RxJS, refer to the official documentation here.

Answer 4

With the latest version of RxJS, which is 5.5+, the catch operator has been marked as deprecated. It is now recommended to use the catchError operator along with the pipe method.

In Angular 5, the default dependency version for RxJS is v5.5.2.

When importing any RxJS Operator, including catchError, make sure to import from 'rxjs/operators' and utilize the pipe operator.

An Example showing error handling for an Http request Observable:

import { Observable } from 'rxjs';
import { catchError } from 'rxjs/operators';
...

export class ExampleClass {
  constructor(private http: HttpClient) {
    this.http.request(method, url, options).pipe(
      catchError((err: HttpErrorResponse) => {
        // Handle error here
      }
    )
  }
  ...
}

Note that catch is now replaced by catchError and the pipe operator is used to compose operators similarly to dot-chaining.

For more information on pipable (formerly known as lettable) operators in RxJS, refer to the official documentation here.

Answer 5

Answer №3

If you are working with angular version 8, here is how you can handle errors:

// Import the necessary operators and observables
import { catchError } from 'rxjs/operators';
import { Observable, throwError } from 'rxjs';

// Implement error handling in your code like this
getEmployees(): Observable<IEmployee[]> {
    return this.http.get<IEmployee[]>(this.url).pipe(catchError(this.erroHandler));
  }

  erroHandler(error: HttpErrorResponse) {
    return throwError(error.message || 'server Error');
  }

Answer 6

If you are working with angular version 8, here is how you can handle errors:

// Import the necessary operators and observables
import { catchError } from 'rxjs/operators';
import { Observable, throwError } from 'rxjs';

// Implement error handling in your code like this
getEmployees(): Observable<IEmployee[]> {
    return this.http.get<IEmployee[]>(this.url).pipe(catchError(this.erroHandler));
  }

  erroHandler(error: HttpErrorResponse) {
    return throwError(error.message || 'server Error');
  }

Answer 7

Answer №4

Verify the Angular version in use and make sure to:

import {Observable} from 'rxjs';

or

import {Observable} from 'rxjs/Rx';

Answer 8

Verify the Angular version in use and make sure to:

import {Observable} from 'rxjs';

or

import {Observable} from 'rxjs/Rx';

The property 'capture' is not found on the data type 'Observable<any>'

Answer №1

Answer №2

An Example showing error handling for an Http request Observable:

Answer №3

Answer №4

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