Angular2动态引用和创建组件

Question

例如，我在一个组件中有一个选项列表，其中单击一个组件会根据用户的选择动态地渲染一个组件。 这是我想象的方式：

列表组件

import { Component } from '@angular/core';
@Component({
    selector: 'list-component',
    templateUrl: `
        <ul>
            <li *ngFor="let item from list" (click)="onClick(item)">{{item.name}}</li>
        </ul>
    `
})
export class ListComponent {

    list = [
        {name: 'Component1'},
        {name: 'Component2'},
        {name: 'Component3'}
    ]

    constructor(private _listService: ListService) {

    }

    onClick(item) {
        this._listService.renderComponent(item);
    }
}

渲染组件

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

@Component({
    selector: 'render-component',
    templateUrl: `
        <div #dynamicComponent></div>
    `
})
export class RenderComponent {

    @ViewChild('dynamicComponent', { read: ViewContainerRef })
    private dynamicComponent: any;

    constructor(
        private _listService: ListService,
        private resolver: ComponentFactoryResolver
    ) {

        this._listService.onRenderComponent.subscribe(item => {
            let componentReference;

            //TODO: Get Component by reference ???

            let componentFactory = this.resolver.resolveComponentFactory(componentReference);
            this.dynamicComponent.createComponent(componentFactory);

        })
    }
}

我已经保留了有关ListService的详细信息，但实际上它是一种允许两个组件进行通信的服务。

我希望不要像这样在ListComponent中引用组件：

import {Component1, Component2, Component3} from './otherComponents';

...

list = [
    {name: 'Component1', component: Component1},
    {name: 'Component2', component: Component2},
    {name: 'Component3', component: Component3}
]

...

this._listService.onRenderComponent.subscribe(item => {
    let componentReference = item.component;

    let componentFactory = this.resolver.resolveComponentFactory(componentReference);
    this.dynamicComponent.createComponent(componentFactory);

})

并让ListService处理它。

因此，从本质上讲，angular是否提供基于某些引用（例如selector ， componentId或沿这些路线的内容）检索Component的方法？

Answer 1

如果您使用的是Angular 2.0 final（我认为不是），则实际上可以通过选择器来解析组件。

 const compFactory = this.factory.componentFactories.find(x => x.selector === 'my-component-selector');
    const injector = ReflectiveInjector.fromResolvedProviders([], this.vcRef.parentInjector);
    const cmpRef = this.vcRef.createComponent(compFactory, this.vcRef.length, injector, []);

我在这里有一个动态组件创建的极简示例