Inject angular component by service

inject_component_service_angular.ts

import {
  ApplicationRef,
  ComponentFactoryResolver,
  ComponentRef,
  EmbeddedViewRef,
  Injectable,
  Injector
} from '@angular/core';

@Injectable()
export class ComponentInjectorService {
  constructor(
    private componentFactoryResolver: ComponentFactoryResolver,
    private appRef: ApplicationRef,
    private injector: Injector
  ) { }


  appendComponentToBody(component: any) {

    // 1. Create a component reference from the component
    const componentRef = this.componentFactoryResolver
      .resolveComponentFactory(component)
      .create(this.injector);

    // 2. Attach component to the appRef so that it's inside the ng component tree
    this.appRef.attachView(componentRef.hostView);

    // 3. Get DOM element from component
    const domElem = (componentRef.hostView as EmbeddedViewRef<any>)
      .rootNodes[0] as HTMLElement;

    // 4. Append DOM element to the body
    document.body.appendChild(domElem);

    // 5. Wait some time and remove it from the component tree and from the DOM
    setTimeout(() => {
      this.appRef.detachView(componentRef.hostView);
      componentRef.destroy();
    }, 3000);

    return componentRef;
  }

  removeComponent(componentRef: ComponentRef<any>) {
    componentRef.destroy();
  }
}