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import {
Injectable, Type, ViewContainerRef, ApplicationRef, ComponentFactory, ComponentFactoryResolver, ComponentRef
} from '@angular/core';
@Injectable()
export class DynamicComponentService {
constructor(private componentFactoryResolver: ComponentFactoryResolver, private applicationRef: ApplicationRef) { }
//Creates a component dynamically (aka during runtime). If a view container is not specified, it will append the new component to the app root.
//To subscribe to an event from invoking component: componentRef.instance.clicked.subscribe((m) => console.log(m.name));
public createDynamicComponent<T>(componentType: Type<T>, viewContainerRef?:ViewContainerRef): ComponentRef<T> {
viewContainerRef = viewContainerRef || this.getRootViewContainerRef();
viewContainerRef.clear();
const factory: ComponentFactory<T> = this.componentFactoryResolver.resolveComponentFactory(componentType); //Ref: https://angular.io/guide/dynamic-component-loader
return viewContainerRef.createComponent(factory);
}
private getRootViewContainerRef(): ViewContainerRef {
return this.applicationRef.components[0].instance.viewContainerRef;
}
};
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