Naveed Ahmed Naveed Ahmed - 3 months ago 282
TypeScript Question

Angular 2 RC 5 Bootstrap custom HTTP class

In Angular 2 RC 4 I have a class HttpLoading which extends the original Http of Angular2

I was able to use that in bootstrap without any issue using the below code:

bootstrap(AppComponent, [
HTTP_PROVIDERS,
provide(RequestOptions, { useClass: DefaultRequestOptions }),
provide(Http, {
useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new HttpLoading(backend, defaultOptions),
deps: [XHRBackend, RequestOptions]
})
]).catch(err => console.error(err));


My DefaultRequest Options class

import { Injectable } from '@angular/core';
import { Headers, BaseRequestOptions } from '@angular/http';

@Injectable()
export class DefaultRequestOptions extends BaseRequestOptions {
headers: Headers = new Headers({
'Content-Type': 'application/json'
});
}


My HttpLoading Class looks like this:

import { Http, RequestOptionsArgs, ConnectionBackend, RequestOptions, Response } from '@angular/http'
import { Injectable } from '@angular/core'
import {GlobalService} from './globalService';
import { Observable } from 'rxjs/Observable';

export class HttpLoading extends Http {

constructor(backend: ConnectionBackend, defaultOptions: RequestOptions, private _globalService: GlobalService) {
super(backend, defaultOptions);
}

get(url: string, options?: RequestOptionsArgs): Observable<any> {
this._globalService.isLoading = true;
return super.get(url, options)
.map(res => {
this._globalService.isLoading = false;
return res.json();
})
.catch(this.handleError);
}
}


With RC 5 I am not sure how do I migrate this portion of the code to NgModule providers list.

I have followed the migration guide and updated my NgModule to the following:

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { FormsModule, ReactiveFormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { Http, HTTP_PROVIDERS, RequestOptions, XHRBackend } from '@angular/http';

import { DefaultRequestOptions } from './DefaultRequestOptions';
import { HttpLoading } from './http-loading';

import { routing } from './app.routing';
import { AppComponent } from './components/app.component';


@NgModule({
imports: [
BrowserModule,
FormsModule,
ReactiveFormsModule,
HttpModule,
routing
],
declarations: [
AppComponent
],
providers: [
HTTP_PROVIDERS,
{ provide: RequestOptions, useClass: DefaultRequestOptions },
{
provide: Http,
useFactory: (backend: XHRBackend, defaultOptions: RequestOptions, globalService: GlobalService) => new HttpLoading(backend, defaultOptions, globalService),
deps: [XHRBackend, RequestOptions, GlobalService]
}
],
bootstrap: [AppComponent],
})
export class AppModule { }


But it still seems that its not properly added because in my component when I use http its still hitting the default http instead of my custom http service.

import { Component, OnInit } from '@angular/core';
import { Http } from '@angular/http';

@Component({
templateUrl: '../../templates/home/home.html'
})
export class HomeComponent implements OnInit {

constructor(private http: Http) {}

ngOnInit() {
this.http.get('/home')
.subscribe((data) => {

});
}
}


Can anyone please guide?

Answer

Thank you so much everyone for your help, I was able to resolve the issue by removing

{ provide: RequestOptions, useClass: DefaultRequestOptions },

Which seems to be unnecassary with RC 5.