Angular 2
Aggiungi componenti dinamicamente usando ViewContainerRef.createComponent

Un componente wrapper che aggiunge i componenti dinamici in modo dichiarativo

Un componente personalizzato che accetta il tipo di un componente come input e crea un'istanza di quel tipo di componente all'interno di se stesso. Quando l'input viene aggiornato, il componente dinamico aggiunto in precedenza viene rimosso e viene aggiunto il nuovo.

@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();
    }
  }
}

Questo ti permette di creare componenti dinamici come

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

Esempio di Plunker

Aggiungi dinamicamente un componente a un evento specifico (fai clic)

File di componente principale:

//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 {}

Esempio di Plunker

Rendering di array di componenti creati dinamicamente su template html in Angular2

Possiamo creare componenti dinamici e ottenere le istanze del componente in un array e infine renderlo sul modello.

Ad esempio, possiamo considerare due componenti widget, ChartWidget e PatientWidget che estendono la classe WidgetComponent che volevo aggiungere nel contenitore.

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 (usando il pannello di primeng)

<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 (uguale al widget grafico usando il pannello di primeng)

WidgetComponent.ts

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

possiamo creare istanze di componenti dinamici selezionando i componenti preesistenti. Per esempio,

@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;
  }
}

Finalmente lo usiamo nel componente 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

Alcune modifiche apportate da @yurzui per utilizzare l'evento del mouse sui widget

view.directive.ts

import {ViewRef, Directive, Input, ViewContainerRef} da '@ 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