Using a SharedModule in Angular2: A Guide

Question

Using a SharedModule in Angular2: A Guide

I have a single Angular2 component that I need to utilize across multiple modules. To achieve this, I created a SharedModule as shown below:

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import {GenericComponent} from './generic/generic.component';
@NgModule({
  imports:      [ BrowserModule ],
  declarations: [ GenericComponent ],
  exports:      [ GenericComponent ]
})
export class SharedModule { }

Subsequently, I included the SharedModule in various modules like so:

app.module.ts

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import {SharedModule} from './shared.module';
import { AppComponent } from './app.component';
@NgModule({
  imports:      [ BrowserModule, SharedModule ],
  declarations: [ AppComponent ],
  exports:      [ AppComponent ],
  bootstrap: [AppComponent]
})
export class AppModule { }

I also integrated the SharedModule into generic.module.ts similarly:

generic.module.ts

import { NgModule }      from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import {SharedModule} from './shared.module';
@NgModule({
  imports:      [ BrowserModule, SharedModule ],
  declarations: [ //.. here I have added all the components that generic uses ]
})
export class GenericModule { }

However, upon attempting to use the generic component within other components of generic.module.ts, I encountered the following error:

Unexpected value 'undefined' imported by the module 'GenericModule'

angular typescript angular2-modules ng-modules

Answer 1

Answer №1

Below is the code snippet from my application utilizing a shared module:

App module:

import { AboutModule } from './about/about.module';
import { SharedModule }   from './shared/shared.module';
import { Menubar, MenuItem } from 'primeng/primeng';

@NgModule({
    imports: [ BrowserModule, RouterModule.forRoot(appRoutes), SharedModule.forRoot(), 
               HomeModule ],
    declarations: [ AppComponent ],
    bootstrap: [ AppComponent ],
    providers: [ appRoutingProviders ]

}) 

export class AppModule {}

The home module:

import { SharedModule }   from '../shared/shared.module';
import {routing} from './home.routing'


@NgModule({
    imports: [ SharedModule, routing],
    declarations: [ HomeComponent, LoginComponent, RegisterComponent, VerifyComponent, 
                   VerifyEmailComponent, ForgotComponent, ForgotVerifyComponent, 
                   ChangeComponent, ChallengeComponent, LogoutComponent ], 
    bootstrap: [ HomeComponent ],
    providers: [ ]

}) 

export class HomeModule {}

Shared Module:

@NgModule({
  imports: [CommonModule, RouterModule, MenubarModule, GalleriaModule, InputTextModule, PanelModule, ButtonModule,
            DropdownModule, DialogModule, AccordionModule, CalendarModule, SelectButtonModule, CheckboxModule,
            ProgressBarModule, DataTableModule],
  declarations: [ ErrorMessagesComponent, FoodDashboardComponent ],
  exports: [ CommonModule, ReactiveFormsModule, HttpModule, RouterModule,
            MenubarModule, GalleriaModule, InputTextModule, PanelModule, ButtonModule, DropdownModule, DialogModule, AccordionModule, CalendarModule,
            SelectButtonModule, CheckboxModule, DataTableModule, ProgressBarModule, ErrorMessagesComponent, FoodDashboardComponent ]
})

export class SharedModule {
  //
  static forRoot(): ModuleWithProviders {
    return {
      ngModule: SharedModule,
      providers: [SettingsService, AppMenuService, AuthorizationService, LoginService, RegisterService, ThemeService, ValidationService,
        NutritionixService, AuthGuardService, CalculationService, ChallengeService ]
    };
  }
}

In my application, I have extensively utilized the shared module in more than 20 modules. It has proven to be effective across various functionalities. Feel free to adapt it for your own usage.

Answer 2

Below is the code snippet from my application utilizing a shared module:

App module:

import { AboutModule } from './about/about.module';
import { SharedModule }   from './shared/shared.module';
import { Menubar, MenuItem } from 'primeng/primeng';

@NgModule({
    imports: [ BrowserModule, RouterModule.forRoot(appRoutes), SharedModule.forRoot(), 
               HomeModule ],
    declarations: [ AppComponent ],
    bootstrap: [ AppComponent ],
    providers: [ appRoutingProviders ]

}) 

export class AppModule {}

The home module:

import { SharedModule }   from '../shared/shared.module';
import {routing} from './home.routing'


@NgModule({
    imports: [ SharedModule, routing],
    declarations: [ HomeComponent, LoginComponent, RegisterComponent, VerifyComponent, 
                   VerifyEmailComponent, ForgotComponent, ForgotVerifyComponent, 
                   ChangeComponent, ChallengeComponent, LogoutComponent ], 
    bootstrap: [ HomeComponent ],
    providers: [ ]

}) 

export class HomeModule {}

Shared Module:

@NgModule({
  imports: [CommonModule, RouterModule, MenubarModule, GalleriaModule, InputTextModule, PanelModule, ButtonModule,
            DropdownModule, DialogModule, AccordionModule, CalendarModule, SelectButtonModule, CheckboxModule,
            ProgressBarModule, DataTableModule],
  declarations: [ ErrorMessagesComponent, FoodDashboardComponent ],
  exports: [ CommonModule, ReactiveFormsModule, HttpModule, RouterModule,
            MenubarModule, GalleriaModule, InputTextModule, PanelModule, ButtonModule, DropdownModule, DialogModule, AccordionModule, CalendarModule,
            SelectButtonModule, CheckboxModule, DataTableModule, ProgressBarModule, ErrorMessagesComponent, FoodDashboardComponent ]
})

export class SharedModule {
  //
  static forRoot(): ModuleWithProviders {
    return {
      ngModule: SharedModule,
      providers: [SettingsService, AppMenuService, AuthorizationService, LoginService, RegisterService, ThemeService, ValidationService,
        NutritionixService, AuthGuardService, CalculationService, ChallengeService ]
    };
  }
}

In my application, I have extensively utilized the shared module in more than 20 modules. It has proven to be effective across various functionalities. Feel free to adapt it for your own usage.

Answer 3

Answer №2

It's important to note that BrowswerModule should not be used in the featureModule. Instead, make sure to utilize CommonModule for this purpose.

import { NgModule }      from '@angular/core';
import { CommonModule }        from '@angular/common';
import {SharedModule} from './shared.module';
@NgModule({
  imports:      [ CommonModule ,SharedModule ],
  declarations: [ //.. here I have added all the components that generic uses ],
  exports:      [ CommonModule]
})
export class GenericModule { }

Answer 4

It's important to note that BrowswerModule should not be used in the featureModule. Instead, make sure to utilize CommonModule for this purpose.

import { NgModule }      from '@angular/core';
import { CommonModule }        from '@angular/common';
import {SharedModule} from './shared.module';
@NgModule({
  imports:      [ CommonModule ,SharedModule ],
  declarations: [ //.. here I have added all the components that generic uses ],
  exports:      [ CommonModule]
})
export class GenericModule { }

Using a SharedModule in Angular2: A Guide

Answer №1

Answer №2

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