Angular - Using a component across multiple modules

MegaTron picture MegaTron · Nov 15, 2017 · Viewed 18.1k times · Source

What I'm using

  • Angular

What I'm trying to do

  • I have a loading component I want to reuse across multiple modules

What I've done

  • I've created a new module called 'loading-overlay'

  • Inside this module I export the overlay component

  • I add this module to app.module

  • When adding the component to multiple modules I receive the following error:

Type LoadingOverlayComponent is part of the declarations of 2 modules: LoadingOverlayModule and ProjectsModule! Please consider moving LoadingOverlayComponent to a higher module that imports LoadingOverlayModule and ProjectsModule. You can also create a new NgModule that exports and includes LoadingOverlayComponent then import that NgModule in LoadingOverlayModule and ProjectsModule.

  • I've tried removing it from app.module and importing it into the other modules I need without much luck. I must be missing some obvious.

Overlay Module

// Modules
import { NgModule } from '@angular/core';

// Components
import { LoadingOverlayComponent } from './loading-overlay.component';



@NgModule({
  declarations: [
    LoadingOverlayComponent,
  ],

  imports: [

  ],

  exports: [
    LoadingOverlayComponent
  ],

  providers: [ ],

})

export class LoadingOverlayModule { }

App Module

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

import { AppComponent } from './app.component';

// Routing
import { AppRouting } from './routing/app-routing';

// Modules
import { ProjectsModule } from './projects/projects.module';
import { UserModule } from './user/user.module';
import { LoadingOverlayModule } from './loading-overlay/loading-overlay.module';


// Services / Providers
import { AuthService } from './user/auth.service'





@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    AppRouting,
    LoadingOverlayModule  
  ],
  providers: [
    AuthService,

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

Project Module

// Modules
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule } from '@angular/router';
import { LoadingOverlayModule } from '../loading-overlay/loading-overlay.module';

import { LoadingOverlayComponent } from '../loading-overlay/loading-overlay.component';






@NgModule({
  declarations: [

    LoadingOverlayComponent
  ],

  imports: [
    CommonModule,
    RouterModule,

    LoadingOverlayModule
  ],

  providers: [ ],

})

export class ProjectsModule { }

Any help pointing out what I've stupidly missed would be greatly appreciated.

Answer

Vivek Doshi picture Vivek Doshi · Nov 15, 2017

Remove :

LoadingOverlayModule from AppModule

LoadingOverlayComponent from ProjectsModule

And :

import LoadingOverlayModule Where its required