Angular 2动态双向绑定(bind)

Question

我正在尝试构建一个动态附加另一个组件的组件。作为示例，这里是我的父类:

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

@Component({
    templateUrl: './app/sample-component.component.html',
    selector: 'sample-component'
})
export class SampleComponent {

    @ViewChild('dynamicContent', { read: ViewContainerRef })
    protected dynamicComponentTarget: ViewContainerRef;
    private currentComponent: ComponentRef<any>;
    private selectedValue: any;

    constructor(private componentResolver: ComponentFactoryResolver) {

    }

    private appendComponent(componentType: any) {
        var factory = this.componentResolver.resolveComponentFactory(componentType);
        this.currentComponent = this.dynamicComponentTarget.createComponent(factory);
    }
}

sample-component.component.html:

<div #dynamicContent></div>

它可以很好地附加一个元素，但我不知道如何动态绑定(bind)双向，就像我在静态组件中所做的那样:[(ngModel)]="selectedValue"

Answer 1

不支持绑定(bind)动态添加的组件。

您可以使用共享服务与动态添加的组件进行通信 ( https://angular.io/docs/ts/latest/cookbook/component-communication.html )
或者您可以使用 this.currentComponent 引用强制读取/设置:

private appendComponent(componentType: any) {
    var factory = this.componentResolver.resolveComponentFactory(componentType);
    this.currentComponent = this.dynamicComponentTarget.createComponent(factory);
    this.currentComponent.instance.value = this.selectedValue;
    this.currentComponent.instance.valueChange.subscribe(val => this.selectedValue = val);
}