//Echange l'input de mail avec celui de password, et ensuite affiche le menu. (Animation)
 void ShowNext(object sender, EventArgs e)
 {
     if (EmailEntry.IsVisible)
     {
         EmailEntry.FadeTo(0, 300, Easing.SinIn);
         EmailEntry.IsVisible = false;
         PassEntry.IsVisible  = true;
         PassEntry.FadeTo(1, 300, Easing.SinOut);
         PassEntry.Focus();
     }
     else
     {
         Navigation.PushAsync(new MenuPage());
     }
 }
        async void AuthButtonClicked(object sender, EventArgs e)
        {
            await btnAuthenticate.FadeTo(0, App.AnimationSpeed, Easing.SinIn);

            btnAuthenticate.IsVisible = false;

            LoadingIndicator.IsVisible = true;
            LoadingIndicator.IsRunning = true;
            LodingLabel.IsVisible      = true;

            if (LabPicker.SelectedIndex == App.labs.Count - 1)
            {
                JsonRequests.labID = 99;
            }
            else
            {
                JsonRequests.labID = LabPicker.SelectedIndex;
            }

            JsonRequests.password = PassEntry.Text;

            if (!await JsonRequests.getUsers())
            {
                System.Diagnostics.Debug.WriteLine("Connection Error!");
                LoadingIndicator.IsVisible = false;
                LoadingIndicator.IsRunning = false;
                LodingLabel.IsVisible      = false;

                btnAuthenticate.IsVisible = true;
                await btnAuthenticate.FadeTo(1, App.AnimationSpeed, Easing.SinIn);

                return;
            }

            LoadingIndicator.IsVisible = false;
            LoadingIndicator.IsRunning = false;
            LodingLabel.IsVisible      = false;

            await label1.FadeTo(0, App.AnimationSpeed, Easing.SinIn);

            await LabPicker.FadeTo(0, App.AnimationSpeed, Easing.SinIn);

            await PassEntry.FadeTo(0, App.AnimationSpeed, Easing.SinIn);


            await Navigation.PushAsync(new MainPage());
        }