Is it possible to run one Angular 2 app several times in one page?

问题

I'm making migration from asp.net web forms to Angular 4. I'm making it step by step. Replacing one part and placing it in production. I face a problem with loading same Angular app several times in page. For example with code

<root tag="table-ep-component" data="5800"></root>
<root tag="table-ep-component" data="3333"></root>

there is only one loaded app in the page - the first one. How can I make them work both? Any suggestions are welcome

回答1:

You can use Applicationref.bootstrap method to do it working:

abstract bootstrap<C>(
  componentFactory: ComponentFactory<C>|Type<C>,
  rootSelectorOrNode?: string|any): ComponentRef<C>;

As we can see this method can take rootSelectorOrNode parameter so we can bootstrap the same component twice.

ngDoBootstrap method on your root @NgModule can help us to manually bootstrap our application:

@NgModule({
   declarations: [AppComponent],
   imports: [BrowserModule], 
   entryComponents: [AppComponent]
})
export class MenuModule {
   ngDoBootstrap(appRef: ApplicationRef) {
     const rootElements = document.queryselectorAll('root');
     // cast due to https://github.com/Microsoft/TypeScript/issues/4947
     for (const element of rootElements as any as HTMLElement[]){
       appRef.bootstrap(AppComponent, element);
     }
   }
}