Question

我创建了一个自定义组件，可以在app.component上正常工作，但是当在延迟加载模块中使用<custom-component>时会出错：

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

我使用的是Angular 4.0.0 / CLI

代码：

app.module.ts

...

import { LoaderComponent } from './shared/components/list-components/loader/loader.component';

@NgModule({
  declarations: [
    AppComponent,
    LoaderComponent <- declared here because I need the component in multiple modules
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

loader.component.ts

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

@Component({
  selector: 'my-component',
  templateUrl: './loader.component.html',
  styleUrls: ['./loader.component.css']
})
export class LoaderComponent implements OnInit {
  @Input() type:any;

  constructor() { }

  ngOnInit() {
  }

}

APP-routing.module.ts

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

const routes: Routes = [

  { path: 'lazy', loadChildren: './lazy/lazy.module#LazyModule' },

];

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

app.component.html

<router-outlet></router-outlet>
<my-component></my-component> <-- works here

和lazy.component.html

<p>
  this module is lazy loaded
  <my-component ></my-component> <- not working
</p>

有什么想法吗？

*更新*

我创建了一个声明LoaderComponent的SharedModule。 SharedModule是在需要LoaderComponent的每个模块中导入的。作品！

Answer 1

您需要创建LoaderModule：

@NgModule({
  imports: [],
  exports: [LoaderComponent],
  declarations: [LoaderComponent],
  providers: [],
})
export class LoaderModule {
}

然后将此模块添加到app.module

@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    LoaderModule,
    BrowserModule,
    FormsModule,
    HttpModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
  })
  export class AppModule { }

确保将LoaderModule也添加到LazyModule

Answer 2

您的AppModule中有LoaderComponent，但您的LazyModule包含 lazy.component.html ，这是错误的。

通过移动 LoaderComponent 进行修复应该在LazyModule的声明中。

@NgModule({
  declarations: [
    AppComponent,
    LoaderComponent //////////// which module does it belongs to?
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    AppRoutingModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

需要更多信息来详细说明该帖子的进一步发展。

Angular <custom-component>不适用于延迟加载的模块

2 个答案: