Angular 13 Directive viewContainerRef.createComponent pass object to created component

Question

The code below with Dynamically create a component in Angular 13

The Directive:

import { Directive, Input, ViewContainerRef, Type } from '@angular/core';

@Directive({
  selector: '[appLoader]'
})
export class LoaderDirective {

  @Input() appLoader!: Type<any>;

  constructor(private viewContainerRef: ViewContainerRef) {}

  ngOnInit(): void {
    this.viewContainerRef.createComponent(this.appLoader);
  }

}

app.component.html

<div [appLoader]="component"></div>

app.component.ts

component = MyComponent

I also need to pass an object into the component that's created which is some extra information which will be used by the created component.

How can I do that?

score 0 · Accepted Answer · answered Nov 22 '21 at 09:38

I imagine you directive can be some like

export class LoaderDirective {

  @Input() appLoader!: Type<any>;
  @Input() arg:any;  //<--you pass as arg any object

  //you need inject ComponentFactoryResolver
  constructor(private viewContainerRef: ViewContainerRef,
              private componentFactoryResolver: ComponentFactoryResolver) {}

  ngOnInit(): void {
    //first you "create" a component
    const component=this.componentFactoryResolver.resolveComponentFactory(this.appLoader)
    //in componentRef you get a instance of the component
    const componentRef=this.viewContainerRef.createComponent(component);

    //you can access to the component using componentRef.instance
    //e.g. componentRef.instance.someMethod()
    //     componentRef.instance.prop="what-ever"

    //I choose use the object pass in the "arg" Input
    Object.keys(this.arg).forEach(x=>{
      componentRef.instance[x]=this.arg[x]
    })
  }

You use like

<div [appLoader]="component" [arg]="{name:'Angular'}"></div>

See a fool stackblitz

In Angular 13 you no longer need to use resolveComponentFactory to create a component with the new api — deszok, Nov 22 '21 at 09:48
This would have worked in prior versions of angular but since ComponentFactoryResolver is deprecated you have to use ViewContainerRef. — Hamfri, Feb 07 '23 at 20:15

Angular 13 Directive viewContainerRef.createComponent pass object to created component

1 Answers1