动态渲染组件

Question

我有这个数组：

this.dashboard = [
     {name: '<app-incassi-provvigioni></app-incassi-provvigioni>'},
     {name: '<app-scheda-punti-vendita></app-scheda-punti-vendita>'}
]

我在ngOnInit循环中填充此数组。我想知道当我在html中读取我的数组时如何渲染组件：

<gridster [options]="gridsterOptions">
    <gridster-item [item]="item" *ngFor="let item of dashboard">
        <!-- your content here -->
        {{item.name}}
    </gridster-item>
</gridster>

当然现在它返回对象中包含的字符串，但我正在尝试找到一个呈现组件的解决方案。有可能这样做吗？

更多细节：我正在开发一个仪表板类型的应用程序，我从数据库中检索用户dashlet的列表，并且我试图在主应用程序组件准备好后动态呈现这些组件。使用Angular 7和Gridster2。

Answer 1

也许你可以使用角度开关：

<div [ngSwitch]="item.name">
    <app-incassi-provvigioni *ngSwitchCase="incassi"></app-incassi-provvigioni>
    <app-scheda-punti-vendita *ngSwitchCase="scheda"></app-scheda-punti-vendita>
</div>

Answer 2

而是传递组件标记名称（在您的情况下为“app-incassi-provvigioni”），传递组件名称（TestComponenet），然后从视图中调用该函数并使用Directive动态呈现它。

例如：

<gridster [options]="gridsterOptions">
    <gridster-item [item]="item" *ngFor="let item of dashboard">
        <div class="inner">
    <ng-template dynamic-template> </ng-template>
</div>
    </gridster-item>
</gridster>

dynamic-template是一个指令，可以帮助我们加载组件。

Answer 3

this.dashboard = [
         {name: 'dashboard1'},
         {name: 'dashboard2'}
    ]

    <gridster [options]="gridsterOptions">
        <gridster-item [item]="item" *ngFor="let item of dashboard">
            <ng-container *ngIf="item.name === 'dashboard1'" *ngTemplateOutlet="dashboard1">
            </ng-container>
            <ng-container *ngIf="item.name === 'dashboard1'" *ngTemplateOutlet="dashboard2">
            </ng-container>
        </gridster-item>
    </gridster>


    <ng-template #dashboard1>
        <app-incassi-provvigioni></app-incassi-provvigioni>
    </ng-template>
    <ng-template #dashboard2>
        <app-scheda-punti-vendita></app-scheda-punti-vendita>
    </ng-template>

Answer 4

你可以注入组件dynamically

只需使用@Input（）组件创建组件;

export class DynamicContentComponent implements OnInit {

  @Input() component: any;
  @Input() data: any;

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

  ngOnInit() {
    const componentFactory = this.componentFactoryResolver.resolveComponentFactory(this.component);
    this.viewContainerRef.clear();

    const componentRef = this.viewContainerRef.createComponent(componentFactory);
    (<DynamicComponentRef>componentRef.instance).data = this.data;
  }
}

并在HTML中使用它

<app-dynamic-content [component]="someComponent" [data]="data"></app-dynamic-content>

数据示例

someComponent = SchedaPuntiVendita;

动态组件应添加到entryComponents中的module

你也可以创建一些factory，它将接收一些字符串，并依赖它返回组件类

工厂的例子

@Injectable()
export class DynamicContentComponentFactory {

  constructor() { }

  get(type: ContentType): any {
    switch (type) {
      case 'scheda':
        return SchedaPuntiVendita;
    }
  }

并稍微修改DynamicContentComponent

@Input() contentType: string;

constructor(..., private factory: DynamicContentComponentFactory) { }
...

const componentFactory = this.componentFactoryResolver.resolveComponentFactory(this.factory.get(this.contentType));

...