I am using
when Compiling the Angular 6 app I got errors, below is just the first one
ERROR in ./src/app/web.service.ts
Module not found: Error: Can't resolve 'rxjs/add/operator/toPromise' in
'C:\Node\ang\frontend\src\app'
My web.service.ts code
import { Http, Headers, Response } from '@angular/http';
import 'rxjs/add/operator/toPromise';
export class WebService{
constructor(private http:Http){
}
getMessages(){
return this.http.get("http://localhost:2000/messages").toPromise();
}
}
My app.module.ts code
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import {NoopAnimationsModule} from '@angular/platform-browser/animations';
import {MatButtonModule,
MatCardModule,
MatSnackBarModule,
MatToolbarModule,
MatInputModule} from '@angular/material';
import { AppComponent } from './app.component';
import { WebService } from './web.service';
import { MessagesComponent } from './messages.component';
import {HttpModule} from '@angular/http';
@NgModule({
declarations: [
AppComponent, MessagesComponent
],
imports: [
BrowserModule, HttpModule, NoopAnimationsModule, MatButtonModule, MatCardModule, MatSnackBarModule, MatToolbarModule, MatInputModule
],
providers: [WebService],
bootstrap: [AppComponent]
})
export class AppModule { }
I am learning Angular from Lynda.com video tutorial. I follow each and every step. but I got the error.
You are using HttpModule which is deprecated you should use HttpClientModule instead
it's recommended to use Observables over promises. By converting to a promise you will lose the ability to cancel a request and the ability to chain RxJS operators.
Before you can use the HttpClient, you need to import the Angular HttpClientModule into root Module.
import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule } from '@angular/common/http';
@NgModule({
imports: [
BrowserModule,
HttpClientModule,
],
//.......
Modified Code:
import { HttpClient} from '@angular/http';
import {Observable} from 'rxjs';
export class WebService{
constructor(private httpc:Http){}
getMessages():Observable<any>{
return this.httpc.get("http://localhost:2000/messages");
}
}
Regarding the error you are getting
As of rxjs 5.5.0-beta.5+ the toPromise method is now a permanent method of Observable. You don't need to import it anymore Reference
Since You are working with RXJS 6+ I would Recommend you to go through the Changes
LIVE DEMO WITH HTTPCLIENT
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