Angular 6：在创建其他模块时无法路由组件（从根到子）

Question

我对angular并不陌生，在定义角度子路线时遇到一些问题。我不知道我在做什么错。为子组件创建不同的模块时，在定义路由时会产生问题。

  

Template parse errors: 'app-sidebar' is not a known element: 1. If 'app-sidebar' is an Angular component, then verify that it is part of this module. 2. If 'app-sidebar' is a Web Component then add 'CUSTOM_ELEMENTS_SCHEMA' to the '@NgModule.schemas' of this component to suppress this message.

错误：

  <h1>Welcome Admin!!</h1>
    <ul>
    <li>[ERROR ->]<app-sidebar></app-sidebar></li>
    <li><router-outlet></router-outlet></li>
    </ul>`

---

这是项目的 structure

project structure

---

这是 main module

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule,Routes } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { ReactiveFormsModule } from '@angular/forms';
import { HttpModule } from "@angular/http";

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

import { AppComponent } from './app.component';
import { HeaderComponent } from './header/header.component';
import { FooterComponent } from './footer/footer.component';
import { MainpageComponent } from './mainpage/mainpage.component';
import { AdminComponent } from './admin/admin.component';

const appRoutes: Routes = [
    {
      path: '',
      component: MainpageComponent
    },
     {
      path: 'admin',
      component: AdminComponent
    }
];

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent,
    MainpageComponent,
    AdminComponent,  
  ],
  imports: [
    BrowserModule,
    AdminModule,
    RouterModule.forRoot(appRoutes),
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

---

这是 admin module

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { RouterModule,Routes } from '@angular/router';
import { FormsModule } from '@angular/forms';
import { ReactiveFormsModule } from '@angular/forms';
import { HttpModule } from "@angular/http";

import { SidebarComponent } from './sidebar/sidebar.component';
import { BookingComponent } from './booking/booking.component';

const adminRoutes: Routes = [
    {
        path: 'booking',
        component: BookingComponent
    }
];

@NgModule({
  imports: [
    BrowserModule,
    CommonModule,
    RouterModule.forChild(adminRoutes),
  ],
  declarations: [  
    SidebarComponent,
    BookingComponent,
  ],
  exports: [
    RouterModule
  ]
})
export class AdminModule { }

---

这是 admin.component.html 中出现问题的html代码

<div class="admin-header">
    <h1>Welcome Admin!!</h1>
    <ul>
    <li><app-sidebar></app-sidebar></li>
    <li><router-outlet></router-outlet></li>
    </ul>
</div>

---

为什么sidebar component路由不起作用？

Answer 1

导入模块的顺序也很重要。您需要在AdminModule之后导入RouterModule.forRoot()，然后在AdminModule中定义一条路由来加载SideBarComponent。