Angular 2.0 final: How to instantiate a component from code

Question

I\'m looking for a way to instantiate a component in Angular2 from within the code of another component. Unlike the many people that have asked a similar question I\'m not so mu

Answer 1

Here's a working demo: https://plnkr.co/edit/pgkgYEwSwft3bLEW95Ta?p=preview

import {Component, NgModule, ViewChild, ElementRef, Input, Output, EventEmitter, ViewContainerRef, ComponentRef, ComponentFactoryResolver, ReflectiveInjector} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@Component({
  selector: 'any-comp',
  template: '
here i am.. {{name}}
'
})
export class AnyComponent {

  @Input() name;
  @Output() clicked = new EventEmitter();

  constructor() {
    console.log('some1 created me.. ! :)');
  }
}

@Component({
  selector: 'my-app',
  template: `
    

      
Hello {{name}}
      
    
  `,
})
export class App {

  @ViewChild('placeHolder', {read: ViewContainerRef}) private _placeHolder: ElementRef;

  name:string;
  constructor(private _cmpFctryRslvr: ComponentFactoryResolver) {
    this.name = 'Angular2'
  }

  ngOnInit() {
    let cmp = this.createComponent(this._placeHolder, AnyComponent);

    // set inputs..
    cmp.instance.name = 'peter';

    // set outputs..
    cmp.instance.clicked.subscribe(event => console.log(`clicked: ${event}`));

    // all inputs/outputs set? add it to the DOM ..
    this._placeHolder.insert(cmp.hostView);
  }

  public createComponent (vCref: ViewContainerRef, type: any): ComponentRef {

    let factory = this._cmpFctryRslvr.resolveComponentFactory(type);

    // vCref is needed cause of that injector..
    let injector = ReflectiveInjector.fromResolvedProviders([], vCref.parentInjector);

    // create component without adding it directly to the DOM
    let comp = factory.create(injector);

    return comp;
  }
}

@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App, AnyComponent ], // ! IMPORTANT
  entryComponents: [ AnyComponent ], // ! IMPORTANT --> would be lost due to Treeshaking..
  bootstrap: [ App ]
})
export class AppModule {}