CODEWITHSUNDEEP
xamarin.forms
Anand
Anand

Reputation: 1959

Distinguish Button click xamarin.forms

Hi I have four buttons in my xamarin.forms application.Each button click will open a listview in a Popup.I am trying to open same popup page on each button click.I am using messeging centre for returning the listview selected item back to button page. Where I am stuck is how can I distinguish the button click in popup page?Should I use a flag or somethong?

My Button page 

  void Button1_Tapped(object sender, EventArgs e)
        {


            PopupNavigation.PushAsync(new AnswerPopup(tranzaction));

            MessagingCenter.Subscribe<MyMessage>(this, "AnsData", (value) =>
            {
                string receivedData = value.Myvalue;
                Answer1.Text = receivedData;
            });
        }

        void Button2_Tapped(object sender, EventArgs e)
        {

            PopupNavigation.PushAsync(new AnswerPopup(tranzaction));

            MessagingCenter.Subscribe<MyMessage>(this, "AnsData", (value) =>
            {
                string receivedData = value.Myvalue;
                Answer2.Text = receivedData;
            });
        }
        void Button3_Tapped(object sender, EventArgs e)
        {

            PopupNavigation.PushAsync(new AnswerPopup(tranzaction));

            MessagingCenter.Subscribe<MyMessage>(this, "AnsData", (value) =>
            {
                string receivedData = value.Myvalue;
                Answer3.Text = receivedData;
            });
        }

My popup page

   private string selectedItem;     
        private void AnsList_Tapped(object sender, SelectedItemChangedEventArgs e)
        {
            var selectedCategory = e.SelectedItem as Answer;
            if (selectedCategory != null)
                selectedItem = selectedCategory.Text;
            MessagingCenter.Send(new MyMessage() { Myvalue = selectedItem.ToString() }, "AnsData");
            PopupNavigation.PopAsync();
        }

Upvotes: 0

Views: 159

Answers (1)

Jason
Jason

Reputation: 89102

first, you don't need to subscribe multiple times, just do it once per page (in the constructor, typically)

second, add a property to MyMessage that will tell you which button as called

MessagingCenter.Subscribe<MyMessage>(this, "AnsData", (value) =>
        {
            string receivedData = value.Myvalue;

            switch (value.Question) {
              case "Q1":
                Answer1.Text = receivedData;
                break;
              case "Q2":
                Answer2.Text = receivedData;
                break;
              case "Q3":
                Answer3.Text = receivedData;
                break;
            }


        });

finally, when calling AnswerPopup, pass a key for the question (which it will then need to pass back via MyMessage when calling MessagingCenter.Send()

void Button1_Tapped(object sender, EventArgs e)
    {
        // use "Q2", "Q3", etc as appropriate
        PopupNavigation.PushAsync(new AnswerPopup(tranzaction, "Q1"));
    }

Upvotes: 1

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