Unable to post HTTP request from Ionic application

Question

I am trying to login to my application hosted locally(for now) using ionic framework.

This is my nodejs backend code for logging in which was meant for web application but now I am making it for android platfrom as well

// process the login form
app.post('/login', passport.authenticate('local-login', {
    successRedirect: '/profile', // redirect to the secure profile section
    failureRedirect: '/login', // redirect back to the signup page if there is an error
    failureFlash: true // allow flash messages
}));

HTML code in ionic

    <ion-item>
        <ion-input type="text" placeholder="Email" name="email" [(ngModel)]="email"></ion-input>
    </ion-item>

    <ion-item>
        <ion-input type="password" placeholder="Password" name="password" [(ngModel)]="password"></ion-input>
    </ion-item>

</ion-list>

The login function which is called:

login() {
this.http.post('10.222.103.169:8080/login', JSON.stringify({ email: this.email, password: this.password }))
    .map((response: Response) => {

        let user = response.json();
        console.log(user);
        if (user && user.token) {
            // store user details and jwt token in local storage to keep user logged in between page refreshes
            localStorage.setItem('currentUser', JSON.stringify(user));
        }
    }
}

if I use .subscribe method for the post it gives an error other login method:

login() {
    this.http.post('10.222.103.169:8080/login', JSON.stringify({ email: this.email, password: this.password }))
    .subscribe(data => {
        console.log(data);
    });
}

Runtime Error Error in ./LoginPage class LoginPage - caused by: Failed to execute 'open' on 'XMLHttpRequest': Invalid URL

but the link is correct and works now the problem is that it's not even sending the post request to the server.

PS: I am new to angular2.

Answer 1

You have to do it as shown below.This is the Angular way of post method.Hope code is self explanatory.If you need any help feel free to comment below.

      //login
      loginUser(email: string, password: string): Observable<any> {
        let headers = new Headers();
        headers.append('content-type', 'application/json');
        let body = { email: email, password: password };
        let options = new RequestOptions({ headers: headers });
        let url = this.authenticationEndPoint + encodeURI(username) + '&password=' + encodeURI(password);

        return this.http.post(url, body, options)
          .map(this.extractData)
          .catch(this.handleError);
      }

 //to extract data
  private extractData(res: Response) {
    let body = res.json();
    return body || {};
  }

  //to handle error
  private handleError(error: Response | any) {
    let errMsg: string;
    if (error instanceof Response) {
      const body = error.json() || '';
      const err = body.error || JSON.stringify(body);
      errMsg = `${error.status} - ${error.statusText || ''} ${err}`;
    } else {
      errMsg = error.message ? error.message : error.toString();
    }
    console.error(errMsg);
    return Observable.throw(errMsg);
  }