I am working on a case where during a network connection we sometimes might have a limited internet connectivity where we unable to get response from the server or failed response as HttpError.
I hereby trying to ping the URL every second to check whether we are getting response or not, for this
I am trying this code, this is working fine in online method but when i am turning my internet of is doesn't return me false value.
fetch-data.service.ts
import { Injectable } from '@angular/core';
import { HttpClient, HttpResponse, HttpErrorResponse } from '@angular/common/http';
import { Posts } from './posts';
import { Observable, interval, throwError, of } from 'rxjs';
import { take, exhaustMap, map, retryWhen, retry, catchError, tap, mapTo, } from 'rxjs/operators';
@Injectable({
providedIn: 'root'
})
export class FetchDataService {
public url = 'https://jsonplaceholder.typicode.com/posts';
constructor(private _httpClient: HttpClient) { }
getData() {
const ob = interval(1000);
return ob.pipe(
exhaustMap(_ => {
return this._httpClient.get<Posts[]>(this.url, { observe: 'response' });
}),
map(val => {
if (val.status === 200)
return true;
throw val;
}),
retryWhen(errors => {
return errors.pipe(map(val => {
if (val.status === 0)
return false;
}))
})
);
}
// private handleError(error: HttpErrorResponse) {
// if (error.error instanceof ErrorEvent) {
// // A client-side or network error occurred. Handle it accordingly.
// console.error('An error occurred:', error.error.message);
// } else {
// // The backend returned an unsuccessful response code.
// // The response body may contain clues as to what went wrong,
// console.error(
// `Backend returned code ${error.status}, ` +
// `body was: ${error.error}`);
// if (error.status !== 200)
// return of(false);
// }
// // return an observable with a user-facing error message
// return throwError(
// 'Something bad happened; please try again later.');
// };
}
pulldata.component.html
import { Component, OnInit } from '@angular/core';
import { FetchDataService } from '../fetch-data.service';
import { Observable } from 'rxjs';
import { Posts } from '../posts';
@Component({
selector: 'app-pulldata',
templateUrl: './pulldata.component.html',
styleUrls: ['./pulldata.component.css']
})
export class PulldataComponent implements OnInit {
public data;
public error = '';
constructor(private _fecthDataServe: FetchDataService) { }
ngOnInit() {
this._fecthDataServe.getData().subscribe(val => {
this.data = val;
console.log(this.data);
});
}
}
what would be the best solution to check the internet connectivity in this manner?