


How Can I Pass Backend-Rendered Parameters to the Angular2 Bootstrap Method?
Dec 11, 2024 am 02:03 AMPassing Backend-Rendered Parameters to Angular2 Bootstrap Method
To pass arguments rendered on the backend to the Angular2 bootstrap method, leverage Angular's dependency injection capabilities. Here's how to achieve it:
var headers = ... // Retrieve headers from the server bootstrap(AppComponent, [{ provide: 'headers', useValue: headers }]);
This approach allows you to inject these parameters into your Angular components or services:
class SomeComponentOrService { constructor(@Inject('headers') private headers) {} }
Alternatively, you can directly provide prepared BaseRequestOptions as follows:
class MyRequestOptions extends BaseRequestOptions { constructor(private headers) { super(); } } var values = ... // Fetch headers from the server var headers = new MyRequestOptions(values); bootstrap(AppComponent, [{ provide: BaseRequestOptions, useValue: headers }]);
With this method, you can use these headers in your Angular application by injecting BaseRequestOptions directly:
class ConfigService { constructor(private http: Http, @Inject(BaseRequestOptions) private baseRequestOptions) { } }
Note: For AoT compilation, move the factory closure outside of the class:
function loadContext(context: ContextService) { return () => context.load(); }
And within the NgModule:
@NgModule({ ... providers: [ ..., ContextService, { provide: APP_INITIALIZER, useFactory: loadContext, deps: [ContextService], multi: true } ],For cyclic dependency issues, inject the Injector and retrieve the dependency:
this.myDep = injector.get(MyDependency);
Instead of directly injecting `MyDependency`:
@Injectable()
export class ConfigService {
private router:Router;
constructor(/private router:Router/ injector:Injector) {
setTimeout(() => this.router = injector.get(Router));
}
}
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