Resolve Type<> of component from string in angular2
Just in case anyone stumbles across this question like me. It is possible without maintaining a registry.
Full credit goes to yurzui for his solution.
Just a copy from there:
import { Type } from '@angular/core';
@Input() comp: string;
...
const factories = Array.from(this.resolver['_factories'].keys());
const factoryClass = <Type<any>>factories.find((x: any) => x.name === this.comp);
const factory = this.resolver.resolveComponentFactory(factoryClass);
const compRef = this.vcRef.createComponent(factory);
You can't do that without maintaining a "registry" for your classes.
interface Component { }
type ComponentClass = { new (): Component };
const REGISTRY = new Map<string, ComponentClass>();
function getTypeFor(name: string): ComponentClass {
return REGISTRY.get(name);
}
As for how to add entries to this REGISTRY
, you have a few options, here are two:
(1) Manually add it after every class definition:
class ComponentA implements Component { ... }
REGISTRY.set("ComponentA", ComponentA);
Or make a function for it:
function register(cls: ComponentClass): void {
REGISTRY.set(cls.name, cls);
}
class ComponentA implements Component { ... }
register(ComponentA);
(2) Use a decorator:
Just use the above register
function as a decorator:
@register
class ComponentA implements Component { ... }