Angular Can't resolve all parameters

Question

Hi i have this error from angular Can't resolve all parameters for RoomService: (?). i have this two files, on is the service.

room.service.ts

import { Injectable } from '@angular/core';
import { ResourceService } from './resource.service';
import { Http } from '@angular/http';
import { CONFIG as APP_CONSTANTS } from '../config/config';

@Injectable()
export class RoomService extends ResourceService {

  constructor(http) {
    super(http);
  }

}

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';

// Angular Material
import { BrowserAnimationsModule } from '@angular/platform-browser/animations';
import { MaterialComponents } from '../ngcomponents/material.component';

import { AppRoutingModule } from './app-routing.module';

// Components
import { AppComponent } from './app.component';
import { RoomlistComponent } from './components/roomlist/roomlist.component';

// services
import { HttpModule } from '@angular/http';
import { RoomService } from './services/room.service';

@NgModule({
  declarations: [
    AppComponent,
    RoomlistComponent
  ],
  imports: [
    BrowserModule,
    AppRoutingModule,
    HttpModule,
    BrowserAnimationsModule,
    MaterialComponents
  ],
  providers: [RoomService],
  bootstrap: [AppComponent]
})
export class AppModule { }

and i don´t have any idea what can the problem, any idea, just in case as you can see the RoomService is extending from another file resourceService i don´t know if that is the problem but i don´t think so.

Pankaj Parkar · Accepted Answer · 2017-10-25 11:26:00Z

2

constructor should have http parameter as of Http type. By which Dependency Resolver will get to know, he should create a token of Http injector.

constructor(http: Http) {
   super(http);
}

answered Oct 25, 2017 at 11:26

Pankaj Parkar

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Comments

Günter Zöchbauer · Accepted Answer · 2017-10-25 11:26:16Z

0

Angular can't figure out what to pass because http doesn't have a type annotation

constructor(http) {

If you change it to

constructor(http:Http) {

and add HttpModule to imports: [...] of the AppModule, it should work. You also need to add a TypeScript import for Http.

Comments

sheplu · Accepted Answer · 2017-10-25 11:26:27Z

0

in your roomService, you DI should be

 constructor(http: Http) {
    super(http);
  }

answered Oct 25, 2017 at 11:26

sheplu

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