动态创建具有ng-content的angular2组件 [英] Creating a angular2 component with ng-content dynamically

问题描述

我想在使用ComponentFactoryResolver动态实例化组件时设置<ng-content>的正文.

I would like to set the body of <ng-content> while instantiating a component dynamically using ComponentFactoryResolver.

我看到我可以访问输入&使用ComponentRef输出，但不是设置<ng-content>的方法.

I see that I can get access to input & output using ComponentRef, but not a way to set <ng-content>.

请注意<ng-content>我正在计划设置，可以包含简单的文本/可以跨越动态创建的组件

Please note <ng-content> I'm planning on setting can contain simple text/can span dynamically created components

@Component({
    selector: 'app-component-to-project',
    template: `<ng-content></ng-content>`
})
export class ComponentToProject implements AfterContentInit {

    ngAfterContentInit() {
        // We will do something important with content here
    }

}


@Directive({
    selector: 'appProjectionMarker'
})
export class ProjectionMarkerDirective implements OnInit {

    constructor(private viewContainerRef: ViewContainerRef, private componentFactoryResolver: ComponentFactoryResolver) {
    }

    ngOnInit() {
        const componentFactory: ComponentFactory<ComponentToProject> = this.componentFactoryResolver.resolveComponentFactory(ComponentToProject);
        const componentRef: ComponentRef<ComponentToProject> = this.viewContainerRef.createComponent(componentFactory);
        // Question: How to set content before the child's afterContentInit is invoked
    }

}

@Component({
    selector: 'appTestComponent',
    template: `<div appProjectionMarker></div>`
})
export class TestComponent {}

推荐答案

vcRef.createComponent方法有projectableNodes参数

createComponent<C>(componentFactory: ComponentFactory<C>, index?: number, injector?: Injector, projectableNodes?: any[][], ngModule?: NgModuleRef<any>): ComponentRef<C>;

您可以使用它动态地将一个组件注入另一个组件.

You can use it to dynamically inject one component in another.

假设我们具有以下组成部分

Let say we have the following component

@Component({
    selector: 'card',
    template: `
        <div class="card__top">
            <h2>Creating a angular2 component with ng-content dynamically</h2>
        </div>
        <div class="card__body">
            <ng-content></ng-content>
        </div>
        <div class="card__bottom">
            <ng-content></ng-content>
        </div>
    `
})
export class CardComponent {}

我们要动态创建它，并将一些控件插入到它的ng-content位置.可以这样完成:

We want to create it dynamically and insert some controls to its ng-content locations. It could be done like follows:

const bodyFactory = this.cfr.resolveComponentFactory(CardBodyComponent);
const footerFactory = this.cfr.resolveComponentFactory(CardFooterComponent);

let bodyRef = this.vcRef.createComponent(bodyFactory);
let footerRef = this.vcRef.createComponent(footerFactory);

const cardFactory = this.cfr.resolveComponentFactory(CardComponent);

const cardRef = this.vcRef.createComponent(
    cardFactory,
    0,
    undefined,
    [
        [bodyRef.location.nativeElement],
        [footerRef.location.nativeElement]
    ]
);

柱塞示例

Plunker Example

另请参见

• 为什么projectableNodes是any [] []?

  Pawel Kozlowski-Angular 2的主动式育儿-NG-BE 2016

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