The ComponentFactoryResolver is a class in Angular that is used to dynamically create components at runtime. However, it has been deprecated in recent versions of Angular. This means that while it may still work in the current version, it is no longer recommended to use it and may be removed in future versions.
Instead of using ComponentFactoryResolver, Angular now encourages the use of the Angular Compiler CLI tool, which provides ahead-of-time (AOT) compilation. AOT compilation statically analyzes your templates and compiles them into highly efficient JavaScript code during the build process. This eliminates the need for dynamic component creation at runtime.
Here’s an example of how to use ComponentFactoryResolver in Angular:
import { Component, ComponentFactoryResolver, ViewChild, ViewContainerRef } from '@angular/core';
@Component({
selector: 'app-dynamic-component',
template: '<ng-container #container></ng-container>',
styleUrls: ['./dynamic-component.component.css']
})
export class DynamicComponentComponent {
@ViewChild('container', { read: ViewContainerRef }) container: ViewContainerRef;
constructor(private componentFactoryResolver: ComponentFactoryResolver) {
}
createDynamicComponent() {
const componentFactory = this.componentFactoryResolver.resolveComponentFactory(DynamicComponent);
// To create the component dynamically, you need a reference to the ViewContainerRef
const componentRef = this.container.createComponent(componentFactory);
// You can then access the instance of the created component
const dynamicComponent = componentRef.instance;
// You can also pass inputs to the created component
dynamicComponent.inputProperty = 'Value';
// You can subscribe to events of the created component
dynamicComponent.outputEvent.subscribe((event) => {
console.log(event);
});
}
}