ion2

  ionViewDidLoad() {
    this.showLoading();
    this.auth.deviceExists().then(result => {
      if(result == 'ok') {
      console.log('status = ok');
        setTimeout(() => {
          this.loading.dismiss();
        });
      } else {
      console.log('status = error');
        setTimeout(() => {
          this.loading.dismiss();
          this.nav.setRoot(RegisterPage);
        });
      }
    }, err => {
      console.log('status = problem');
      setTimeout(() => {
        this.loading.dismiss();
        this.nav.setRoot(RegisterPage);
      });
    }).catch((err) => {
      this.loading.dismiss();
//      this.nav.setRoot(RegisterPage);
      this.showError(err);
    });
  }



deviceExists()
{
  console.log(this.deviceID);
  return new Promise((resolve, reject) => {
    if (this.deviceID === null) {
      reject("Device ID is null");
    } else {
        this.isLoggedIn().subscribe(result => {
          resolve(result['status']);
        }, (err) => {
          reject(err);
        });
    }
  }).catch(err => {
    return "error";
  });
}

isLoggedIn()
{
      let url = `${this.apiURL}getdevice`;
      let params = `deviceid=${this.deviceID}`;
      let headers = new Headers({ 'Content-Type': 'application/x-www-form-urlencoded'});
      let options = new RequestOptions({ headers: headers });
      return this.http.post(url, params, options)
        .map(res => { return res.json(); })
        .catch(res => { return res.json(); });
}