How can I preload data before loading a lazy module in Angular? I attempted using app_initializer, but it didn't work due to an existing app_initializer in AppModule. Is there a different approach to achieve this?
How can I preload data before loading a lazy module in Angular? I attempted using app_initializer, but it didn't work due to an existing app_initializer in AppModule. Is there a different approach to achieve this?
One way to improve performance is by utilizing a Resolver to preprocess your data before loading the module and navigating to a specific route only after it has been completely loaded.
An example of a resolver:
import { Injectable } from '@angular/core';
import { APIService } from './api.service';
import { Resolve } from '@angular/router';
import { ActivatedRouteSnapshot } from '@angular/router';
@Injectable()
export class APIResolver implements Resolve<any> {
constructor(private apiService: APIService) {}
resolve(route: ActivatedRouteSnapshot) {
return this.apiService.getItems(route.params.date);
}
}
Implementing the resolver in your route configuration:
{
path: 'items/:date',
component: ItemsComponent,
resolve: { items: APIResolver }
}
To access the resolved data in the desired component:
import { ActivatedRoute } from '@angular/router';
constructor(private route: ActivatedRoute) { }
items: any[];
ngOnInit() {
this.items= this.route.snapshot.data.items;
}
By using a component with a resolver within a module, you ensure that the module will not initialize until all data has been resolved.
For more information on resolvers, refer to https://angular.io/api/router/Resolve
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