'map' is not defined in the current Typescript scope

As a newcomer to AngularJS, I am encountering an error when attempting to send a post request to my localhost server. The error message states [ts] cannot find name 'map' and cannot find name 'subscribe'. Any assistance in understanding and resolving this issue would be greatly appreciated. Thank you.

login.ts

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { Http ,Headers ,HttpModule} from '@angular/http';
import 'rxjs/add/operator/map';

/**
 * Generated class for the Login page.
 *
 * See http://ionicframework.com/docs/components/#navigation for more info
 * on Ionic pages and navigation.
 */
@IonicPage()
@Component({
  selector: 'page-login',
  templateUrl: 'login.html',
})
export class Login {

  constructor(public navCtrl: NavController, public navParams: NavParams,public http:Http) {
  }

  ionViewDidLoad() {
    console.log('ionViewDidLoad Login');
  }
  
  ionViewidData(){
    let headers= new Headers();
    headers.append('Content-Type','application/json');

    let body = {
      device:"Mobile",
      id:"10077",
      password:"leechan2"
    };
    
    console.log(body);
    this.http.post('http://0.0.0.0:2800/login',JSON.stringify(body),{headers:headers})
        .map(res => res.json())
        .subscribe(data =>{
          console.log(data);
        });

}

}

Answer №1

There is an unexpected ; found at line this.http.post.

this.http.post('http://0.0.0.0:2800/login',JSON.stringify(body),{headers:headers})           //    <--------- remove ; in this section
    .map(res => res.json())
    .subscribe(data =>{
      console.log(data);
    });

Answer №2

**When calling this.http.post, remember to eliminate the semicolon and consider utilizing a private http:Http within the constructor instead**

this.http.post('http://0.0.0.0:2800/login', JSON.stringify(body), {headers: headers})
    .map(res => res.json())
    .subscribe(data =>{
      console.log(data);
    });

Answer №3

Before embarking on your journey, make sure to bring it along:

import { map } from 'rxjs/operators';

This method has proven successful for me.

Answer №4

Errors in syntax can sometimes lead to confusing outcomes that may not directly highlight the main issue at hand. In this case, you mistakenly ended your 'post' method with a ';' which prevents the 'map' method from being called on any object. The absence of anything before the '.' is what is causing the 'map' method to appear missing. To resolve this issue, simply remove the ';' after 'headers});'.

Here's how it should look:

this.http.post('http://0.0.0.0:2800/login', JSON.stringify(body), { headers: headers }).map(res => res.json()).subscribe(data => { console.log(data); });

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