尝试为Angular 5创建自定义错误处理程序以处理从Java收到的错误时出现JavaScript错误。
为此,我遵循了本教程:
https://itnext.io/how-to-handle-your-run-time-errors-in-your-angular-application-8d72fefbf8a4
但是我收到此错误:
Cannot instantiate cyclic dependency! ApplicationRef ("[ERROR ->]"): in NgModule App.module in ./AppModule@-1:-1
这是app.module.ts:
import {ErrorHandler, NgModule} from '@angular/core';
import {BrowserModule} from '@angular/platform-browser';
import {FormsModule, ReactiveFormsModule} from '@angular/forms';
import {FooterComponent, LayoutModule, MainComponent, NavbarComponent} from './layout/index';
import {HomeModule} from './home/home.module';
import {HttpClient, HttpClientModule} from '@angular/common/http';
import {TranslateLoader, TranslateModule} from '@ngx-translate/core';
import {TranslateHttpLoader} from '@ngx-translate/http-loader';
import {KblEventManager} from './service/event-manager.service';
import {
AddActionModule,
KBL_BASEURL,
KblHttpInterceptorModule,
KblSpinnerComponent,
KblSpinnerModule
} from '@kbl/components';
import {SlideinModule} from './slidein/slidein.module';
import {RouterModule} from '@angular/router';
import {APP_ROUTES} from './app.route';
import {BrowserAnimationsModule} from '@angular/platform-browser/animations';
import {SharedModule} from './shared/shared.module';
import {NgbModule} from '@ng-bootstrap/ng-bootstrap';
import {environment} from '../environments/environment';
import {HttpSpinnerComponent} from './layout/spinner/http-spinner.component';
import {AuthenticationService} from './model/authenticationService';
import {LoginService} from './login.service';
import {AppErrorHandlerService} from './app-error-handler.service';
import {RecommendationTableModule} from './recommendation-table/recommendation-table.module';
import {ReportingModule} from './reporting/reporting.module';
import {ReportModule} from './add-recommendation/report.module';
import {FollowUpModule} from './update-recommendation-dialog/follow-up.module';
import {MatSharedModule} from './shared/mat-shared.module';
const APP_BASE_URL
= {provide: KBL_BASEURL, multi: true, useValue: environment.BASE_URL};
const APP_ERROR_HANDLER
= {provide: ErrorHandler, useClass: AppErrorHandlerService};
export function createTranslateLoader(http: HttpClient) {
return new TranslateHttpLoader(http, './assets/i18n/', '.json');
}
/*export function bootstrap(authentificationService: AuthenticationService): () => Promise<any> {
return (): Promise<any> => {
return authentificationService.initApp().toPromise();
};
}*/
@NgModule({
imports: [
BrowserModule,
LayoutModule,
FormsModule,
BrowserAnimationsModule,
HomeModule,
ReportingModule,
ReportModule,
FollowUpModule,
RecommendationTableModule,
RouterModule.forRoot(APP_ROUTES, {useHash: true}),
TranslateModule.forRoot({
loader: {
provide: TranslateLoader,
useFactory: (createTranslateLoader),
deps: [HttpClient]
}
}),
AddActionModule,
SlideinModule,
HttpClientModule,
SharedModule,
MatSharedModule,
NgbModule,
KblHttpInterceptorModule.forRoot(),
],
declarations: [
MainComponent,
FooterComponent,
NavbarComponent,
// ManualAuthenticationDialogComponent,
HttpSpinnerComponent,
],
entryComponents: [
KblSpinnerComponent,
],
providers: [
APP_ERROR_HANDLER,
KblEventManager,
APP_BASE_URL,
AuthenticationService,
LoginService],
bootstrap: [MainComponent]
})
export class AppModule {
}
仅在添加ErrorHandler类后,我才收到此错误;如果我从提供程序中删除了该错误,则它可以正常运行,但没有异常处理程序。
这是我的错误堆栈:
[Error] Error: Provider parse errors:
Cannot instantiate cyclic dependency! ApplicationRef ("[ERROR ->]"): in NgModule AppModule in ./AppModule@-1:-1
parse (compiler.js:19771)
compile (compiler.js:20360)
_compileModule (compiler.js:34658)
compileModuleAsync (compiler.js:34481)
bootstrapModule (core.js:5783)
Codice Eval
eval
../../../../../src/main/webapp/app/main.ts (main.bundle.js:281)
__webpack_require__ (inline.bundle.js:55)
(funzione anonima) (main.bundle.js:549)
__webpack_require__ (inline.bundle.js:55)
webpackJsonpCallback (inline.bundle.js:26)
Codice globale (main.bundle.js:1)
这是AppErrorHandler.ts:
import {ErrorHandler, Injectable} from '@angular/core';
import {BAD_REQUEST, FORBIDDEN, UNAUTHORIZED} from 'http-status-codes';
import {Router} from '@angular/router';
import {Toast, ToastsManager} from 'ng2-toastr';
@Injectable()
export class AppErrorHandlerService implements ErrorHandler {
static readonly REFRESH_PAGE_ON_TOAST_CLICK_MESSAGE: string = 'An error occurred: Please click this message to refresh';
static readonly DEFAULT_ERROR_TITLE: string = 'Something went wrong';
constructor(private router: Router, private toastManager: ToastsManager) { }
public handleError(error: any) {
console.error(error);
let httpErrorCode = error.httpErrorCode;
switch (httpErrorCode) {
case UNAUTHORIZED:
this.router.navigateByUrl('/login');
break;
case FORBIDDEN:
this.router.navigateByUrl('/unauthorized');
break;
case BAD_REQUEST:
this.showError(error.message);
break;
default:
this.showError(AppErrorHandlerService.REFRESH_PAGE_ON_TOAST_CLICK_MESSAGE);
}
}
private showError(message: string) {
this.toastManager.error(message, AppErrorHandlerService.DEFAULT_ERROR_TITLE, { dismiss: 'controlled'}).then((toast: Toast) => {
let currentToastId: number = toast.id;
this.toastManager.onClickToast().subscribe(clickedToast => {
if (clickedToast.id === currentToastId) {
this.toastManager.dismissToast(toast);
window.location.reload();
}
});
});
}
}