角动态组件:@ViewChildren为QueryList中的每个组件获取ViewContainerRef [英] Angular Dynamic Components: @ViewChildren get ViewContainerRef for every component in QueryList

问题描述

我正在构建一个带有动态选项卡的对话框，该对话框可以接收要放置在选项卡主体中的组件.我很难使用@ViewChildren创建多个动态组件.过去我很容易用一个组件和@ViewChild来完成此操作.

I am building a dialog with dynamic tabs that can receive a component to be placed in the tab body. I am having a hard time creating multiple dynamic components using @ViewChildren. I have successfully done this with a single component and @ViewChild in the past quite easily.

这是我的模板:

<mat-tab *ngFor="let tab of tabs" [label]="tab.label">
     <ng-template #comp></ng-template>
</mat-tab>

这是我的组件逻辑:

@ViewChildren("comp") dynComponents: QueryList<any>;


public ngAfterContentInit() {
  this.tabs.forEach(tab => {
     const factory = this._resolver.resolveComponentFactory(tab.component);
     console.log(this.dynComponents); // Returns undefined.

     // this.componentRef = this.vcRef.createComponent(factory);
  });
}

即使在模板中对组件进行硬编码时，我的dynComponents也未定义.我似乎需要从此dynComponents QueryList获取ViewContainerRef，但是我不确定为什么它根本没有填充.我将此帖子用作参考:帖子

My dynComponents are undefined even when hard-coding components in the Template. I need to seemingly get the ViewContainerRef from this dynComponents QueryList, but I am not sure why it is not populating at all. I used this post for reference: Post

推荐答案

@ViewChildren 无效，因为它缺少指示ViewContainerRef的read元数据属性.

import {
  AfterContentInit, Component, ComponentFactoryResolver, QueryList, Type, ViewChildren, ViewContainerRef
} from '@angular/core';


@Component({
  selector: 'dynamic-dialog',
  templateUrl: './dynamic-dialog.component.html',
  styleUrls: ['./dynamic-dialog.component.scss']
})
export class DynamicDialogComponent implements AfterContentInit {
  @ViewChildren('comp', { read: ViewContainerRef })
  public dynComponents: QueryList<ViewContainerRef>;

  public tabs = [];

  constructor(private _resolver: ComponentFactoryResolver) {}

  ngAfterContentInit() {
    this.dynComponents.map(
      (vcr: ViewContainerRef, index: number) => {
        const factory = this._resolver.resolveComponentFactory(
          this.tabs[index].component);
        vcr.createComponent(factory);
      }
    )
  }
}

p.s.可以使用生命周期挂钩 AfterContentInit 或

p.s. Dynamic content may be loaded using lifecycle hook AfterContentInit or AfterViewInit.

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