Angular 2
Ajout dynamique de composants à l'aide de ViewContainerRef.createComponent

Un composant wrapper qui ajoute des composants dynamiques de manière déclarative

Un composant personnalisé qui prend le type d'un composant en entrée et crée une instance de ce type de composant à l'intérieur de lui-même. Lorsque l'entrée est mise à jour, le composant dynamique ajouté précédemment est supprimé et le nouveau composant ajouté.

@Component({
  selector: 'dcl-wrapper',
  template: `<div #target></div>`
})
export class DclWrapper {
  @ViewChild('target', {
    read: ViewContainerRef
  }) target;
  @Input() type;
  cmpRef: ComponentRef;
  private isViewInitialized: boolean = false;

  constructor(private resolver: ComponentResolver) {}

  updateComponent() {
    if (!this.isViewInitialized) {
      return;
    }
    if (this.cmpRef) {
      this.cmpRef.destroy();
    }
    this.resolver.resolveComponent(this.type).then((factory: ComponentFactory < any > ) => {
      this.cmpRef = this.target.createComponent(factory)
        // to access the created instance use
        // this.cmpRef.instance.someProperty = 'someValue';
        // this.cmpRef.instance.someOutput.subscribe(val => doSomething());
    });
  }

  ngOnChanges() {
    this.updateComponent();
  }

  ngAfterViewInit() {
    this.isViewInitialized = true;
    this.updateComponent();
  }

  ngOnDestroy() {
    if (this.cmpRef) {
      this.cmpRef.destroy();
    }
  }
}

Cela vous permet de créer des composants dynamiques comme

<dcl-wrapper [type]="someComponentType"></dcl-wrapper>

Exemple Plunker

Ajouter dynamiquement un composant sur un événement spécifique (cliquez sur)

Fichier principal:

//our root app component
import {Component, NgModule, ViewChild, ViewContainerRef, ComponentFactoryResolver, ComponentRef} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import {ChildComponent} from './childComp.ts'

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello {{name}}</h2>
      <input type="button" value="Click me to add element" (click) = addElement()> // call the function on click of the button
      <div #parent> </div> // Dynamic component will be loaded here
    </div>
  `,
})
export class App {
  name:string;
  
  @ViewChild('parent', {read: ViewContainerRef}) target: ViewContainerRef;
  private componentRef: ComponentRef<any>;

  constructor(private componentFactoryResolver: ComponentFactoryResolver) {
    this.name = 'Angular2'
  }
  
  addElement(){
    let childComponent = this.componentFactoryResolver.resolveComponentFactory(ChildComponent);
    this.componentRef = this.target.createComponent(childComponent);
  }
}

childComp.ts:

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

@Component({
  selector: 'child',
  template: `
    <p>This is Child</p>
  `,
})
export class ChildComponent {
  constructor(){
    
  }
}

app.module.ts:

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, ChildComponent ],
  bootstrap: [ App ],
  entryComponents: [ChildComponent] // define the dynamic component here in module.ts
})
export class AppModule {}

Exemple Plunker

Rendu le tableau de composants créé dynamiquement sur le modèle HTML dans Angular2

Nous pouvons créer un composant dynamique et obtenir les instances du composant dans un tableau, puis le rendre sur un modèle.

Par exemple, nous pouvons prendre en compte deux composants de widget, ChartWidget et PatientWidget, qui ont étendu la classe WidgetComponent que je voulais ajouter dans le conteneur.

ChartWidget.ts

@Component({
selector: 'chart-widget',
templateUrl: 'chart-widget.component.html',
providers: [{provide: WidgetComponent, useExisting: forwardRef(() => ChartWidget) }]
})

export class ChartWidget extends WidgetComponent implements OnInit {
       constructor(ngEl: ElementRef, renderer: Renderer) {
    super(ngEl, renderer);
    }
    ngOnInit() {}
     close(){
      console.log('close');
    }
    refresh(){
      console.log('refresh');
    }
    ...
}

chart-widget.compoment.html (en utilisant primeng Panel)

<p-panel [style]="{'margin-bottom':'20px'}">
    <p-header>
        <div class="ui-helper-clearfix">
           <span class="ui-panel-title" style="font-size:14px;display:inline-block;margin-top:2px">Chart Widget</span>
            <div class="ui-toolbar-group-right">                
               <button pButton type="button" icon="fa-window-minimize" (click)="minimize()"</button>
              <button pButton type="button" icon="fa-refresh" (click)="refresh()"></button>
              <button pButton type="button"  icon="fa-expand" (click)="expand()" ></button>
             <button pButton type="button" (click)="close()" icon="fa-window-close"></button>
                    </div>
                </div>
    </p-header>
      some data
</p-panel>

DataWidget.ts

@Component({
    selector: 'data-widget',
    templateUrl: 'data-widget.component.html',
    providers: [{provide: WidgetComponent, useExisting: forwardRef(() =>DataWidget) }]
    })

export class DataWidget extends WidgetComponent implements OnInit {
       constructor(ngEl: ElementRef, renderer: Renderer) {
    super(ngEl, renderer);
    }
    ngOnInit() {}
    close(){
      console.log('close');
    }
    refresh(){
      console.log('refresh');
    }
    ...
}

data-widget.compoment.html (identique au widget graphique utilisant primeng Panel)

WidgetComponent.ts

@Component({
  selector: 'widget',
  template: '<ng-content></ng-content>'
})
export  class WidgetComponent{
}

Nous pouvons créer des instances de composants dynamiques en sélectionnant les composants préexistants. Par exemple,

@Component({

    selector: 'dynamic-component',
    template: `<div #container><ng-content></ng-content></div>`

})
export class DynamicComponent {
@ViewChild('container', {read: ViewContainerRef}) container: ViewContainerRef; 

    public addComponent(ngItem: Type<WidgetComponent>): WidgetComponent {
    let factory = this.compFactoryResolver.resolveComponentFactory(ngItem);
    const ref = this.container.createComponent(factory);
    const newItem: WidgetComponent = ref.instance;              
    this._elements.push(newItem);                 
    return newItem;
  }
}

Enfin, nous l'utilisons dans le composant app. app.component.ts

@Component({
  selector: 'app-root',
  templateUrl: './app/app.component.html',
  styleUrls: ['./app/app.component.css'],
  entryComponents: [ChartWidget,  DataWidget], 
})

export class AppComponent {
   private elements: Array<WidgetComponent>=[];
   private WidgetClasses = {
      'ChartWidget': ChartWidget,
      'DataWidget': DataWidget        
  }
  @ViewChild(DynamicComponent) dynamicComponent:DynamicComponent;  
  
   addComponent(widget: string ): void{                         
     let ref= this.dynamicComponent.addComponent(this.WidgetClasses[widget]);    
     this.elements.push(ref); 
     console.log(this.elements);
  
     this.dynamicComponent.resetContainer();                     
  }
}

app.component.html

<button (click)="addComponent('ChartWidget')">Add ChartWidget</button>
<button (click)="addComponent('DataWidget')">Add DataWidget</button>

<dynamic-component [hidden]="true" ></dynamic-component>  

<hr>
Dynamic Components
<hr>
<widget *ngFor="let item of elements">
    <div>{{item}}</div>
   <div [innerHTML]="item._ngEl.nativeElement.innerHTML | sanitizeHtml">
   </div>
</widget>

https://plnkr.co/edit/lugU2pPsSBd3XhPHiUP1?p=preview

Quelques modifications de @yurzui pour utiliser l'événement mouse sur les widgets

view.directive.ts

import {ViewRef, Directive, Input, ViewContainerRef} de '@ angular / core';

@Directive({
    selector: '[view]'
})
export class ViewDirective {
  constructor(private vcRef: ViewContainerRef) {}

  @Input()
  set view(view: ViewRef) {
    this.vcRef.clear();
    this.vcRef.insert(view);
  }

  ngOnDestroy() {
    this.vcRef.clear()
  }
}

app.component.ts

private elements: Array<{ view: ViewRef, component: WidgetComponent}> = [];

...
addComponent(widget: string ): void{
  let component = this.dynamicComponent.addComponent(this.WidgetClasses[widget]);
  let view: ViewRef = this.dynamicComponent.container.detach(0);
  this.elements.push({view,component});

  this.dynamicComponent.resetContainer();
}

app.component.html

<widget *ngFor="let item of elements">
  <ng-container *view="item.view"></ng-container>
</widget>

https://plnkr.co/edit/JHpIHR43SvJd0OxJVMfV?p=preview