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Dynamically Loading Components in Angular Using ComponentFactoryResolver

Dynamically Loading Components in Angular Using ComponentFactoryResolver

Shemang David's photo
Shemang David
·Feb 3, 2023·

2 min read

In Angular, the ComponentFactoryResolver service allows you to dynamically load a component at runtime. This powerful tool allows you to create and render a component without the need to define it in the template. This can be useful in a variety of situations, such as when you need to load a component based on user interaction or when you need to load a component based on data from an API.

The first step in using the ComponentFactoryResolver service is to import it and the ViewContainerRef from @angular/core. The ViewContainerRef is a container where we will insert the dynamically created component.

import { ComponentFactoryResolver, ViewContainerRef } from '@angular/core';

Next, you'll need to create a reference to the ViewContainerRef in your component. You can do this by injecting it in the constructor and storing it as a property of the class.

constructor(private resolver: ComponentFactoryResolver, private container: ViewContainerRef) {}

You can use the resolver.resolveComponentFactory() method to create a ComponentFactory for the component that you want to load. This method takes the component type as a parameter and returns a factory that you can use to create an instance of the component.

const factory = this.resolver.resolveComponentFactory(DynamicComponent);
``

Next, you can use the createComponent() method of the ViewContainerRef to create an instance of the component and insert it into the view. The createComponent() method takes the component factory as a parameter and returns a reference to the dynamically created component instance.

const componentRef = this.container.createComponent(factory);

You can access the properties and methods of the dynamically created component instance by using the instance property of the component reference. For example, if your component has a property called message, you can set it as follows:

componentRef.instance.message = "Hello World!";

You can also access the component's output events using the componentRef.instance.event.subscribe() method. For example, if your component has an output event called onSave, you can subscribe to it as follows:

componentRef.instance.onSave.subscribe((data) => {
  console.log(data);
});

Finally, you can remove the dynamically created component from the view using the destroy() method of the component reference.

componentRef.destroy();

In conclusion, the ComponentFactoryResolver service provides a powerful tool for dynamically loading components in Angular. By using this service, you can create and render a component at runtime, giving you greater control over the components that are displayed in your application.

 
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