Login

login(){
      var count;
      let loading = this.loadingCtrl.create({
         content: 'Logging in...'
      });

      loading.present();
      var link = this.constant.apiURL+'api/login';
      var myData = {username: this.data.username, password:this.data.password};

      this.http.post(link, myData)
      .subscribe(data => {
         localStorage.setItem('user',JSON.stringify(data['_body']));
          try{
            var user = JSON.parse(JSON.parse(localStorage.getItem('user')));
            count = Object.keys(user).length;
          }catch(e){
            count = 0;
          }

          if (count == 0) {
            loading.dismiss();
            let alert = this.alertCtrl.create({
              title: 'Ooops!',
              subTitle: data['_body'],
              buttons: ['OK']
            });
            alert.present();
          }else{
            this.navCtrl.setRoot(HomePage);
            loading.dismiss();
          }
      }, error => {
        var err = JSON.parse(error['_body'])
          let alert = this.alertCtrl.create({
              title: 'Ooops!',
              subTitle: err.error,
              buttons: ['OK']
            });
            alert.present();
          console.log(err);
          loading.dismiss();
      });
  }