Dynamic template “transclusion” in Angular2

问题

I am trying to achieve something like this: I have a model class called ObjectTypeA, ObjectTypeB and ObjectTypeC. There is also a factory ComponentFactory, which based on the type of object passed in will create different components:

ComponentFactory.ts

export interface ComponentFactoryInterface {

    static CreateComponent(obj: CommonSuperObject)

}

@Injectable()
export class ComponentFactory {

    public static CreateComponent(obj: CommonSuperObject){

        if (obj instanceof ObjectTypeA){
            return ObjectComponentA()
        }else if (obj instanceof ObjectTypeB){
            return ObjectComponentB()
        }

    }
}

In the template I would like to do something like this:

main_template.html

<components>
  <component *ngFor="#obj in objects">
     <!-- insert custom component template here -->
  </component>
</components>

How do I insert the associated components dynamically ?

I could do something like this (not my preferred way of doing it):

<components>
  <!-- loop over component models -->
  <custom-component-a *ngIf="models[i] instanceof ObjectTypeA">
  </custom-component-a>
  <custom-component-b *ngIf="models[i] instanceof ObjectTypeB">
  </custom-component-b>
</components>

But this is seems really wrong to me on many levels (I would have to modify this code and the factory code if I add another component type).

Edit - Working Example

constructor(private _contentService: ContentService, private _dcl: DynamicComponentLoader, componentFactory: ComponentFactory, elementRef: ElementRef){

    this.someArray = _contentService.someArrayData;
    this.someArray.forEach(compData => {
    let component = componentFactory.createComponent(compData);
        _dcl.loadIntoLocation(component, elementRef, 'componentContainer').then(function(el){
            el.instance.compData = compData;
        });
    });

}

回答1:

update

DCL is deprecated since a while. Use ViewContainerRef.createComponent instead. For an example (with Plunker) see Angular 2 dynamic tabs with user-click chosen components

original

You can use ngSwitch (similar to your own workaround but more concise) or DynamicComponentLoader

See also

• https://angular.io/docs/ts/latest/api/core/DynamicComponentLoader-class.html
• How to use angular2 DynamicComponentLoader in ES6?

来源：https://stackoverflow.com/questions/34457716/dynamic-template-transclusion-in-angular2