Angular 2 组件未加载到不同的模块中

Question

我正在构建一个具有根模块的应用程序，然后在此模块下是 3 个子模块。在模块 1 中，有一个可以在模块 3 中重用的组件，但是，如果我直接访问模块 3 中的组件 URL，则永远不会加载该组件（我认为这是因为模块 1 没有加载）。我已经尝试从模块 1 中导出组件并在根模块中引导它，但是我收到一个错误，提示找不到组件选择器

---编辑---

根模块

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    ManagerModule,
    LogadoModule,
    GeralModule,
    RouterModule.forRoot(routes, {useHash: true})
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

模块 1

@NgModule({
    declarations: [
        GeralComponent,
        GeralHeaderComponent,
        LoginComponent,
        AtividadesListagemComponent // -> COMPONENT TO BE SHARED
    ],
    imports: [
        CommonModule,
        ReactiveFormsModule,
        FormsModule,
        GeralRoutingModule
    ], 
    providers: [GeralService],
    exports: [GeralComponent],
    bootstrap: [GeralComponent]
})
export class GeralModule{}

模块 3 // -> 在这个模块中使用共享组件

@NgModule({
    declarations: [
        LogadoComponent,
        AtividadesInscritoComponent,
        LogadoHeaderComponent
    ],
    imports: [
        CommonModule,
        ReactiveFormsModule,
        FormsModule,
        LogadoRoutingModule
    ], 
    providers: [],
    exports: [LogadoComponent],
    bootstrap: [LogadoComponent]
})
export class LogadoModule{}

项目结构为：

根模块 模块 1 模块 2 模块 3

----编辑 2 -----

共享模块

@NgModule({
  imports: [CommonModule],
  exports : [
    CommonModule,
    AtividadesListagemComponent
  ],
  declarations: [AtividadesListagemComponent]
})
export class SharedModule { }

根模块

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    ManagerModule,
    LogadoModule,
    GeralModule,
    RouterModule.forRoot(routes, {useHash: true})
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

模块 1

@NgModule({
    declarations: [
        GeralComponent,
        GeralHeaderComponent,
        LoginComponent
    ],
    imports: [
        CommonModule,
        ReactiveFormsModule,
        FormsModule,
        GeralRoutingModule,
        SharedModule
    ], 
    providers: [GeralService],
    exports: [GeralComponent],
    bootstrap: [GeralComponent]
})
export class GeralModule{}

模块 3

@NgModule({
    declarations: [
        LogadoComponent,
        AtividadesInscritoComponent,
        LogadoHeaderComponent
    ],
    imports: [
        CommonModule,
        ReactiveFormsModule,
        FormsModule,
        LogadoRoutingModule,
        SharedModule
    ], 
    providers: [],
    exports: [LogadoComponent],
    bootstrap: [LogadoComponent]
})
export class LogadoModule{}

Answer 1

当您有一个需要跨多个模块共享的组件时，推荐的方法是将该组件添加到SharedModule，然后将该共享模块导入任何需要它的模块中。

在本例中，StarComponent 由多个模块共享：

import { NgModule }  from '@angular/core';
import { CommonModule } from '@angular/common';
import { FormsModule } from '@angular/forms';

import { StarComponent } from './star.component';

@NgModule({
  imports: [ CommonModule],
  exports : [
    CommonModule,
    FormsModule,
    StarComponent
  ],
  declarations: [ StarComponent ],
})
export class SharedModule { }

这是 Product 模块如何导入它的：

import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';

import { ProductListComponent } from './product-list.component';
import { ProductDetailComponent } from './product-detail.component';

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

@NgModule({
  imports: [
    SharedModule,
    RouterModule.forChild([
      { path: '', component: ProductListComponent },
      { path: ':id', component: ProductDetailComponent }
    ])
  ],
  declarations: [
    ProductListComponent,
    ProductDetailComponent
  ]
})
export class ProductModule { }

我这里有完整的示例代码：https://github.com/DeborahK/Angular2-GettingStarted/tree/master/APM%20-%20Final