Http service not found

Question

Http service not found

I am facing a problem with injecting HTTP into my Angular 2 application. Everything was working smoothly a few days ago, but now I am encountering this error:

ORIGINAL EXCEPTION: No provider for Http!

Here is the code snippet from main.ts:

import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';
import { AppModule } from './app.module';
import { LoginModule } from "./login/login.module";
import { Http } from "@angular/http";


platformBrowserDynamic().bootstrapModule(LoginModule);

Code from login module.ts:

@NgModule({
    imports: [BrowserModule, FormsModule], // external modules for all components
    declarations: [LoginComponent], // component which belong to this module
    bootstrap: [LoginComponent] // component on load
})
export class LoginModule {
}

And here's the LoginComponent code in LoginModule:

import { Component } from '@angular/core';
import { AccountService } from "../data/account.service";
import { Http, Response, RequestOptions, Headers } from '@angular/http';
import { LocalStorage } from '../storage/storage';

@Component({
    selector: 'tp-login',
    templateUrl: `app/login/login.html`,
    styleUrls: ['app/login/login.css'],
    providers: [AccountService, LocalStorage]

})

The exception in LoginComponent pertains to the lack of an HttpProvider. Can anyone suggest a solution to resolve this issue?

angular typescript

Answer 1

Answer №1

It's a good practice to group all your module dependencies within the main class module using the @NgModule attribute.

import { BrowserModule } from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [],
  bootstrap: [AppComponent]
})

This ensures that when your module is included as a child dependency, all dependencies will be resolved beforehand.

Answer 2

It's a good practice to group all your module dependencies within the main class module using the @NgModule attribute.

import { BrowserModule } from '@angular/platform-browser';
import {NgModule} from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AppComponent } from './app.component';

@NgModule({
  declarations: [
    AppComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    RouterModule.forRoot(appRoutes)
  ],
  providers: [],
  bootstrap: [AppComponent]
})

This ensures that when your module is included as a child dependency, all dependencies will be resolved beforehand.

Answer 3

Answer №2

Inside the Application Module.

Include HttpModule and Http from @angular/http:

import {HttpModule, RequestOptions, XHRBackend, Http} from "@angular/http";

Add the HttpModule to the import property in @NgModule declarations:

imports: [
    HttpModule,
]

Specify Http in the Providers property of @NgModule

providers: [
    {provide: Http, useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new Http(backend, defaultOptions),
        deps: [XHRBackend, RequestOptions]}
],

Answer 4

Inside the Application Module.

Include HttpModule and Http from @angular/http:

import {HttpModule, RequestOptions, XHRBackend, Http} from "@angular/http";

Add the HttpModule to the import property in @NgModule declarations:

imports: [
    HttpModule,
]

Specify Http in the Providers property of @NgModule

providers: [
    {provide: Http, useFactory: (backend: XHRBackend, defaultOptions: RequestOptions) => new Http(backend, defaultOptions),
        deps: [XHRBackend, RequestOptions]}
],

Answer 5

Answer №3

To start, eliminate the line that reads import { LoginModule } from "./login/login.module"; in your main.ts file, as this will not address the issue at hand.

Consider instead adding HttpModule to either your Login module file or to your root module:

import { HttpModule } from '@angular/http';
@NgModule({
    imports: [HttpModule, BrowserModule, FormsModule], 
    declarations: [LoginComponent], // components associated with this module
    bootstrap: [LoginComponent] // component to load first
})
export class LoginModule {
}

Answer 6

To start, eliminate the line that reads import { LoginModule } from "./login/login.module"; in your main.ts file, as this will not address the issue at hand.

Consider instead adding HttpModule to either your Login module file or to your root module:

import { HttpModule } from '@angular/http';
@NgModule({
    imports: [HttpModule, BrowserModule, FormsModule], 
    declarations: [LoginComponent], // components associated with this module
    bootstrap: [LoginComponent] // component to load first
})
export class LoginModule {
}

Answer 7

Answer №4

To implement the HttpModule in your Angular application, make sure to include it in both your component/service file and app module file.

import { Http , HttpModule} from '@angular/http';

Add the HttpModule import statement to your app.module.ts:

import { Http ,HttpModule} from '@angular/http';

Remember to also include HttpModule in the 'imports' array within your NgModule:

imports: [ 
    BrowserModule,
    HttpModule ]

Answer 8

To implement the HttpModule in your Angular application, make sure to include it in both your component/service file and app module file.

import { Http , HttpModule} from '@angular/http';

Add the HttpModule import statement to your app.module.ts:

import { Http ,HttpModule} from '@angular/http';

Remember to also include HttpModule in the 'imports' array within your NgModule:

imports: [ 
    BrowserModule,
    HttpModule ]

Http service not found

Answer №1

Answer №2

Answer №3

Answer №4

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