Question

在我的Angular应用程序中，有一个全局错误处理程序和一个负责进行http调用的服务，返回类型为Observable<any>。有些服务已明确处理了错误，而有些则没有。

对于尚未捕获的那些，全局错误（具有类' CustomErrorHandler '）运行良好。对于已经妥善处理并捕获的服务调用，全局错误似乎没有触发。

我的问题：是否有一种方法可以执行全局错误处理，而不管是否已经处理了http服务调用？

custom-error-handler.service.ts

@Injectable()
export class CustomErrorHandler implements ErrorHandler {
    constructor(private injector: Injector) { }

    handleError(error) {
        error = error || new Error('There was an unexpected error');
        const loggingService: LoggerService = this.injector.get(LoggerService);
        const location = this.injector.get(LocationStrategy);
        const message = error.message ? error.message : error.toString();
        const url = location instanceof PathLocationStrategy
        ? location.path() : '';

        // get the stack trace, lets grab the last 10 stacks only
        StackTrace.fromError(error).then(stackframes => {
            const stackString = stackframes
                .splice(0, 20)
                .map((sf) => {
                    return sf.toString();
                }).join('\n');

            // log with logging service
            loggingService.error({ message, url, stack: stackString });

        });

        throw error;
    }

}

auth.service.ts

@Injectable()
export class UserAuthService {
    login(emailAddress: string, password: string): Observable<boolean> {
        if (this.isAuthenticated()) {
        return Observable.of(true);
        }

        return Observable.create(observer => {
        this.http.get('http://someurl/login')
            .map(res => res.json())
            .subscribe(
              data => {
                observer.next(this.isAuthorized);
                observer.complete();
              }, err => {
                observer.error(err);
              }
           );
        });
    }

  }

my-component.ts

import { UserAuthService } from '../services/auth.service';

@Component({
    selector: 'my-component',
    templateUrl: './my-component.html',
    styleUrls: ['./my-component.scss']
})
export class MyComponent {
    constructor(private authService: UserAuthService) {}

    handleLogin() {
        this.authService.login(formValues.emailAddress, formValues.password)
            .subscribe(res => {
                console.log('Logged In');
            }, err => {
                console.log('Logging Failed'); 
                // Global Error DOESN'T fire here as the Error has been handled
            });
    }

    handleLoginPart2() {
        this.authService.login(formValues.emailAddress, formValues.password)
            .subscribe(res => {
                console.log('Logged In');
            }); // Global Error does fire here as the Error has NOT been handled
    }
}

Answer 1

我可以通过创建一个继承自HttpClient的{{1}}来解决此问题。

通过这样做，我可以优雅地处理错误。

http-client.service.ts

Http

Angular 2-仅当未捕获到错误时才执行全局错误处理程序

1 个答案: