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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.

3 Answers 3

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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); } 
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Comments

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.

See also

Comments

0

in your roomService, you DI should be

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

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