Lazy Loading BrowserModule has already been loaded

问题

I am trying to implement lazy loading but getting error as following **

ERROR Error: Uncaught (in promise): Error: BrowserModule has already been loaded. If you need access to common directives such as NgIf and NgFor from a lazy loaded module, import CommonModule instead.

Need Help on this. Here are my Modules

Shared MOdule

@NgModule({

  declarations: [TimePipe],
  providers: [
    EmsEmployeeService,
    EmsDesignationService,
    EmsOrganizationService,
    EmsAuthService,
    AmsEmployeeService,
    AmsShiftService,
    ValidatorService,
    AmsLeaveService,
    AmsAttendanceService,
    AmsDeviceService,
    AmsOrganizationService,
    AmsAlertService,
    AmsHolidayService,
    AutoCompleteService,
    AmsTimelogsService,
    LocalStorageService
  ],
  imports: [
    HttpModule,
    ToastyModule.forRoot(),
    AgmCoreModule.forRoot({
      apiKey: 'xxxxxxxxxxxxxxxxxxxxxxxxxxx'
    }),
  ],
  exports: [
    FormsModule,
    HttpModule,
    BrowserAnimationsModule,
    RouterModule,
    MaterialModule,
    MdDatepickerModule,
    MdNativeDateModule,
    ToastyModule,
    FileUploadModule,
    NgxPaginationModule,
    NguiAutoCompleteModule,
    AgmCoreModule,
    TimePipe
  ]
})
export class SharedModule { }

2.SettingModule

 @NgModule({
  imports: [
    CommonModule,
    SharedModule,
    SettingsRoutingModule
  ],
  declarations: [
    SettingsComponent,
    ShiftsComponent,
    DevicesComponent,
    AlertsComponent,
    HolidaysComponent,
    AlterTypesComponent,
    AlterEditComponent,
    ShiftTypeNewComponent,
    DeviceLogsComponent,
    ChannelTypesComponent,
    ChannelTypeEditComponent
  ], exports: [
    SettingsComponent,
    ShiftsComponent,
    DevicesComponent,
    AlertsComponent,
    HolidaysComponent,
    AlterTypesComponent,
    AlterEditComponent,
    ShiftTypeNewComponent,
    DeviceLogsComponent,
    ChannelTypesComponent,
    ChannelTypeEditComponent,
  ]
})
export class SettingsModule { }

3.SettingRoutingModule

const settings_routes: Routes = [
  { path: '', redirectTo: 'shifts', pathMatch: 'full' },
  { path: 'shifts', component: ShiftsComponent },
  { path: 'shifts/new', component: ShiftTypeNewComponent },
  { path: 'shifts/edit/:id', component: ShiftTypeNewComponent },
  { path: 'devices', component: DevicesComponent },
  { path: 'deviceLogs', component: DeviceLogsComponent },
  { path: 'holidays', component: HolidaysComponent },
  { path: 'alerts', component: AlertsComponent },
  { path: 'alerts/types', component: AlterTypesComponent },
  { path: 'alerts/:id', component: AlterEditComponent },
  { path: 'channelTypes', component: ChannelTypesComponent },
  { path: 'channelTypes/:id', component: ChannelTypeEditComponent }
];


const routes: Routes = [
  { path: '', component: SettingsComponent, children: settings_routes }
];



@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule]
})
export class SettingsRoutingModule { }

App-routing-module

const attdendance_routes: Routes = [
  { path: '', redirectTo: 'daily', pathMatch: 'full' },
  { path: 'monthly', component: MonthlyComponent },
  { path: 'daily', component: DailyComponent },

  { path: 'daily/:empId', component: AttendanceDetailsComponent },
  { path: 'details/:empId', component: AttendanceDetailsComponent },
  { path: 'monthly/:empId', component: AttendanceDetailsComponent },
  { path: 'leaves/:empId', component: AttendanceDetailsComponent },

  { path: 'details/:empId/apply-leave', component: ApplyLeaveComponent },
  { path: 'daily/:empId/apply-leave', component: ApplyLeaveComponent },
  { path: 'daily/:empId/attendance-logs/:ofDate', component: AttendanceLogsComponent },
  { path: 'monthly/:empId/apply-leave', component: ApplyLeaveComponent },
  { path: 'leaves/:empId/apply-leave', component: ApplyLeaveComponent },
  { path: 'leaves/new/apply', component: ApplyLeaveComponent },

  { path: 'leaves', component: LeavesComponent },
  { path: 'leave-balances', component: LeaveBalancesComponent },
  { path: 'leave-balances/:empId', component: AttendanceDetailsComponent },
  { path: 'manage-leaves', component: ManageLeavesComponent },

];



const emp_routes: Routes = [
  { path: '', redirectTo: 'list', pathMatch: 'full' },
  { path: 'list', component: EmployeeListComponent },
  { path: 'list/:id', component: EmpEditComponent },
  { path: 'designations', component: DesignationsComponent }
];



const page_routes: Routes = [
  { path: '', redirectTo: 'attendances', pathMatch: 'full' },
  { path: 'employees', component: EmployeesComponent, children: emp_routes },
  { path: 'attendances', component: AttendancesComponent, children: attdendance_routes },

  { path: 'settings', loadChildren: './pages/settings/settings.module#SettingsModule' },
];

// main routes
const routes: Routes = [
  { path: '', redirectTo: 'pages', pathMatch: 'full' },
  { path: 'login', component: LoginComponent, canActivate: [LoginGuard] },
  { path: 'pages', component: PagesComponent, canActivate: [UserGuard], children: page_routes },
  { path: 'loginViaOrg', component: OrgLoginComponent },
  { path: 'download', component: AppDownloadComponent },
  { path: '**', redirectTo: 'pages' },
];

@NgModule({
  imports: [RouterModule.forRoot(routes, { useHash: true })],
  exports: [RouterModule]
})
export class AppRoutingModule { }

5.AppModule

@NgModule({

  declarations: [
    AppComponent,
    PagesComponent,
    LoginComponent,
    EmployeesComponent,
    OrgLoginComponent,
    EmployeeListComponent,
    EmpEditComponent,
    DayEventDialogComponent,
    AttendancesComponent,
    MonthlyComponent,
    AttendanceDetailsComponent,
    DailyComponent,
    DeviceDialogComponent,
    LeaveActionDialogComponent,
    LeavesComponent,
    LeaveBalancesComponent,
    ManageLeavesComponent,
    ApplyLeaveComponent,
    ConfirmDialogComponent,
    ResetPasswordDialogComponent,
    AppDownloadComponent,
    DesignationsComponent,
    AttendanceLogsComponent,
  ],

  entryComponents: [
    DayEventDialogComponent,
    DeviceDialogComponent,
    LeaveActionDialogComponent,
    ConfirmDialogComponent,
    ResetPasswordDialogComponent
  ],

  imports: [
    BrowserModule,
    // CommonModule,
    SharedModule,
    AppRoutingModule,
    // feature modules
    // SettingsModule
  ],

  providers: [
    LoginGuard, UserGuard,
  ],

  bootstrap: [AppComponent]
})
export class AppModule { }

回答1:

Import BrowserModule, BrowserAnimationsModule, HttpModule or HttpClientModule only once, preferably in your root module.

回答2:

This error can occur if you have imported BrowseModule in some child.app module.ts also. Please make sure you import CommonModule in all modules other than app.module as it has browser modules.

回答3:

I also got the same error and finally, after little bit struggle, I was able to fix it.

Import these mentioned modules only once(in app-module only):

BrowserModule, BrowserAnimationsModule, LazyLoadImageModule (if using it), CarouselModule (if using it), InfiniteScrollModule (if using it), HttpModule ( if using it)

回答4:

I had the same problem and Jota.Toledo gave the correct answer and I want only extend that: please check in shared module imports any modules that related with

@angular/platform-browser/animations

and move those modules into app.module.ts

回答5:

@First Import BrowerModule and in imports also first include BrowserModule import:[BrowerModule ] 

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

import { AppRoutingModule } from './app-routing.module';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

If we declare BrowserModule in any module other than app module(Duplicate) this error will come. the In app module if we import 10 modules or plugins, first we have to import BrowserModule at the top and declare in decorates (import:[BrowserModule ]) at the top

回答6:

Include all the common modules in parent component only(or appModule only). In child module, include only Child specific modules.

Also, you might need to add schemas: [NO_ERRORS_SCHEMA], in your child modules and parent modules

回答7:

If you are using multiple modules, use Browser module only once in your app module or some custom module and use CommonModule from @angular/common in custom modules.

I was getting the same error , I was trying to reuse components, directives, pipes in multiple components/modules. Instead I imported all reusable components in a core module and imported the core module in multiple components/modules.

回答8:

In my case I had shared module which was importing BrowserAnimationModule. I was importing shared module in my root module. to solve this error remove all imports of BrowserAnimationModule from all modules and add it to root module.

imports: [
    AppRoutingModule,
    SharedModule,
    BrowserAnimationsModule
  ],

来源：https://stackoverflow.com/questions/45975675/lazy-loading-browsermodule-has-already-been-loaded

标签

angular

typescript

angular2-routing

lazy-loading

angular2-modules