聊聊Angular中懒加载模块并动态显示它的组件

import { NgModule } from '@angular/core';
import { CommonModule } from '@angular/common';
import { ToolbarComponent } from './toolbar.component';
 
@NgModule({
    declarations: [ToolbarComponent],
    imports: [CommonModule],
    exports: [ToolbarComponent],
})
class ToolbarModule {}
 
export { ToolbarComponent, ToolbarModule };

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

@Component({
    selector: 'toolbar',
    templateUrl: './toolbar.component.html',
    styles: [
        `
    svg {
      width: 64px;
      height: 64px;
    }
    img {
      width: 64px;
      height: 64px;
      object-fit: cover;
    }
    `,
    ],
})
export class ToolbarComponent implements OnInit {
    constructor() {}

    ngOnInit(): void {}
}

  
  
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import { Component, createNgModuleRef, Injector, ViewChild, ViewContainerRef } from '@angular/core';

@Component({
    selector: 'root',
    template: `
               

                 

                   
                 
                 

                   {{ isToolbarVisible ? '隐藏' : '显示' }}
                   
首屏内容
                 

               

             `,
})
export class AppComponent {
    title = 'ngx-lazy-load-demo';
    toolbarLoaded = false;
    isToolbarVisible = false;
    @ViewChild('toolbar', { read: ViewContainerRef }) toolbarViewRef!: ViewContainerRef;

    constructor(private _injector: Injector) {}

    toggleToolbarVisibility() {
        this.isToolbarVisible = !this.isToolbarVisible;
        this.loadToolbarModule().then();
    }

    private async loadToolbarModule() {
        if (this.toolbarLoaded) return;
        this.toolbarLoaded = true;
        const { ToolbarModule, ToolbarComponent } = await import('./toolbar/toolbar.module');
        const moduleRef = createNgModuleRef(ToolbarModule, this._injector);
        const { injector } = moduleRef;
        const componentRef = this.toolbarViewRef.createComponent(ToolbarComponent, {
            injector,
            ngModuleRef: moduleRef,
        });
    }
}