在Angular2中引导多个组件

问题描述

我的问题与以下问题一致:引导多个angular2模块时出错

My question is inline with this question:Error when bootstrapping multiple angular2 modules

我的 index.html 具有以下代码

  <app-header>Loading header...</app-header>
  <app-root>Loading...</app-root>
  <app-footer>Loading footer...</app-footer>

在我的 app.module.ts 中，我提供了这三个组件进行引导:

In my app.module.ts, I supply those 3 components to bootstrap:

bootstrap: [AppComponent,HeaderComponent,FooterComponent]

在我的main.ts中，我引导了它们

and in my main.ts, I bootstrap them

platformBrowserDynamic().bootstrapModule(AppModule);

该应用程序在包括的所有三个模块中都可以正常工作.将其中任何一个删除后，该应用程序都可以运行，但在控制台中收到的错误很少.

The application works fine with all the three modules included. When either of them is removed, the app works but I receive few errors in the console[img attached].

我正在尝试在同一组件中创建独立的模块，这些模块可以插入应用程序或从应用程序中插入.例如，一个页眉，页脚和主体模块.某些页面可能不需要标题，因此我可以跳过app-header包含.

I am trying to create independent modules within the same component that can be plugged in and out of the application. Like for example, a header, footer and body module. Some pages may not need the header, so I can skip the app-header include.

我的方法正确吗?

推荐答案

我刚刚发现此，效果很好

import { NgModule, Injectable, APP_INITIALIZER, ApplicationRef, Type, ComponentFactoryResolver } from '@angular/core';
import {FooterComponent} from './footercomponent';
import {AppComponent} from './appcomponent';
import {HeaderComponent} from './headercomponent';

const components = [AppComponent, HeaderComponent,FooterComponent];

@NgModule({
  declarations: [
    AppComponent,
    HeaderComponent,
    FooterComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule
  ],
  entryComponents: components,
  providers: []
})
export class AppModule {

    constructor(private resolver: ComponentFactoryResolver) { }

    ngDoBootstrap(appRef: ApplicationRef) {
        components.forEach((componentDef: Type<{}>) => {
            const factory = this.resolver.resolveComponentFactory(componentDef);
            if (document.querySelector(factory.selector)) {
                appRef.bootstrap(factory);
            }
        });
    }
}

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