Angular5使用模块中的组件

Question

我是 A5 的菜鸟，正在做我的第一个“将组件重构为模块”。我正在尝试使用在另一个模块的一个模块中定义的组件。我得到了错误，ERROR in src/app/app-routing.module.ts(9,10): error TS2305: Module '"xxx/src/app/admin/admin.module"' has no exported member 'AdminHomeComponent'.

我查看了其他相关问题，但我只是缺少一些东西。希望你能帮忙。

app-routing.module.ts:

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { CommonModule } from '@angular/common';
import { HomeComponent } from './home/home.component';
import { ArchitectureComponent } from './architecture/architecture.component';
import { DesignComponent } from './design/design.component';
import { HistoryComponent } from './history/history.component';
import { AdminHomeComponent } from './admin/admin.module';

const routes: Routes = [
  { path: '', redirectTo: '/home', pathMatch: 'full' },
  { path: 'home', component: HomeComponent },
  { path: 'architecture', component: ArchitectureComponent },
  { path: 'design', component: DesignComponent },
  { path: 'history', component: HistoryComponent }
];

@NgModule({
  exports: [ RouterModule ],
  imports: [ RouterModule.forRoot(routes)]
})

export class AppRoutingModule { }

src/app/admin/admin.module:

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { AdminHomeComponent } from './admin-home/admin-home.component';

@NgModule({
  imports: [
    CommonModule
  ],
  exports: [
    AdminHomeComponent
  ],
  declarations: [
    AdminHomeComponent  // <-- Tried adding this based on comments, no help
  ]
})
export class AdminModule { }

src/app/admin/admin-home/admin-home.component.ts

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-admin-home',
  templateUrl: './admin-home.component.html',
  styleUrls: ['./admin-home.component.scss']
})
export class AdminHomeComponent implements OnInit {

  constructor() { }

  ngOnInit() {
  }

}

如果有帮助的话，

src/app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule, NO_ERRORS_SCHEMA } from '@angular/core';
import { MDBBootstrapModule } from 'angular-bootstrap-md';
import { TreeModule } from 'angular-tree-component';

import { AppComponent } from './app.component';
...
import { HomeComponent } from './home/home.component';
import { ComponentsModule } from './components/components.module';
import { AdminModule } from './admin/admin.module';

@NgModule({
  declarations: [
    AppComponent,
    ...
    HomeComponent,
    AdminModule   // <-- Tried adding this based on comments, but no help
  ],
  imports: [
    BrowserModule,
    MDBBootstrapModule.forRoot(),
    TreeModule,
    AppRoutingModule,
    AdminModule,
    ComponentsModule
  ],
  schemas: [ NO_ERRORS_SCHEMA ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

也许答案很简单：直接从模块中导入组件？

但是我不应该只通过从模块中导入该组件来使用从模块中导出的组件吗？

感谢您的任何建议！

Answer 1

如果你从模块文件中导入它，你必须在你的 admin.module.ts 中以这种方式导出它

  import { AdminHomeComponent } from './admin-home/admin-home.component';
  export {AdminHomeComponent };

Answer 2

您从错误的文件导入。

import { AdminHomeComponent } from './admin/admin.module';

将文件名中的module 替换为component。

Answer 3

你忘了在模块中声明它

试试这个

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { AdminHomeComponent } from './admin-home/admin-home.component';

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

我还发现在 app-routing.module.ts: 你有 import { AdminHomeComponent } from './admin/admin.module'; 删除它。

而是在 src/app/admin/admin.module 中这样做

import { NgModule } from '@angular/core';
import { RouterModule} from '@angular/router';
import { CommonModule } from '@angular/common';
import { AdminHomeComponent } from './admin-home/admin-home.component';

@NgModule({
  imports: [
    CommonModule,
    RouterModule.forRoot([
    { path: 'admin', component: AdminHomeComponent } 
  ])
  ],
  exports: [
    AdminHomeComponent
  ],
  declarations: [AdminHomeComponent]
})
export class AdminModule { }