@zsoltszabo/reg-pontok-terkep/src/app/rp-terkep/shared/reg-pont.service.ts

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import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';
import { RegPont } from './reg-pont';

@Injectable({
    providedIn: 'root'
})
export class RegPontService {
    regPontokUrl: string = "";

    constructor(private http: HttpClient) { }

    getRegpontObservable(): Observable<RegPont[]> {
        return this.http.get<RegPont[]>(this.regPontokUrl).pipe(
            catchError(this.handleError)
        );
    }

    private handleError(err: HttpErrorResponse) {
        let errorMessage = '';
        if (err.error instanceof ErrorEvent) {
            // A client-side or network error occurred. Handle it accordingly.
            errorMessage = `An error occurred: ${err.error.message}`;
        } else {
            // The backend returned an unsuccessful response code.
            // The response body may contain clues as to what went wrong,
            errorMessage = `Server returned code: ${err.status}, error message is: ${err.message}`;
        }
        console.error(errorMessage);
        return throwError(errorMessage);
    }
}