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How Can I Pass Backend-Rendered Parameters to the Angular2 Bootstrap Method?
How Can I Pass Backend-Rendered Parameters to the Angular2 Bootstrap Method?
Dec 11, 2024 am 02:03 AM
Passing 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));
}
}
The above is the detailed content of How Can I Pass Backend-Rendered Parameters to the Angular2 Bootstrap Method?. For more information, please follow other related articles on the PHP Chinese website!
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