rxjs5 - Handling Angular 2 http errors centrally -


i have code handles http access in class handles adding tokens. returns observable. want catch errors in class - in particular authentication problems. rxjs beginner , can't figure out how , still return observable. pointer comprehensive rxjs 5 documentation (that isn't source code!) useful.

you can leverage catch operator when executing http call within service:

getcompanies() {   return this.http.get('https://angular2.apispark.net/v1/companies/')            .map(res => res.json())            .catch(res => {              //               // throw error, use observable.throw              // return observable.throw(res.json());            }); }

another approach extend http object intercept errors:

@injectable() export class customhttp extends http {   constructor(backend: connectionbackend, defaultoptions: requestoptions) {     super(backend, defaultoptions);   }    request(url: string | request, options?: requestoptionsargs): observable<response> {     console.log('request...');     return super.request(url, options).catch(res => {       //     });           }    get(url: string, options?: requestoptionsargs): observable<response> {     console.log('get...');     return super.get(url, options).catch(res => {       //     });   } }

and register described below:

bootstrap(appcomponent, [http_providers,     new provider(http, {       usefactory: (backend: xhrbackend, defaultoptions: requestoptions) => new customhttp(backend, defaultoptions),       deps: [xhrbackend, requestoptions]   }) ]);

what use depends on use case...


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