why is the lamp changing color?

Hi

The lamp in this short app is not supposed to change color when something is typed in the first field ( Nr of zones) because the criterion I have is related to the second field (Nr Of salts).

Can anybody check and tell me , I have tried to put a condition so that it is supposed to show magenta when the first field (Nr of Zones) is empty . I dont know how to program the app so it lamp color does not change from magenta to red when the user just has typed in Nr of Zones and not reached to the second field (Nr of Salts)

Answer 1

[VBBV]

Hi Mauzmi Ali ,

In the app designer code, the editField component accepts numeric inputs. By default the Matlab editField component assigns a value 0, Hence you need to change the code as shown below with additional conditions added in the if statement.

if ~isempty(app.antall_soner)

    if (app.NrofsaltsEditField.Value>3) || (app.NrofsaltsEditField.Value>=1 && app.NrofsaltsEditField.Value<2)

        app.Lamp.Color='red';
        app.EditField.Value='Choose minimum 2 salts and maximum 3 salts';
    % if the user inputs salts without number of zone inputs
    elseif (app.NrofsaltsEditField.Value==3||app.NrofsaltsEditField.Value==2) && (app.NrofzonesEditField.Value == 0)

        app.Lamp.Color='red';
        app.EditField.Value='Please enter Number of Zones';

    elseif (app.NrofsaltsEditField.Value==3||app.NrofsaltsEditField.Value==2) && (app.NrofzonesEditField.Value ~= 0)

        app.Lamp.Color='green';
        app.EditField.Value='Input accepted!';

    end

    app.nr_zones_analyzed=app.nr_zones_analyzed+1;

end

[VBBV]

The lamp is changing color due to presence of default value of 0 in the edit field related to app.NrofsaltsEditField.Value If you observe the if-condition thats present in your code (shown below), it will always satisfy the condition, because edit field value is 0 which is less than 2

if (app.NrofsaltsEditField.Value>3) ||  app.NrofsaltsEditField.Value<2)

Hence, you need to modify it as below

if (app.NrofsaltsEditField.Value>3) || (app.NrofsaltsEditField.Value>=1 && app.NrofsaltsEditField.Value<2)

[Muazma Ali]

@VBBV thanks a lot for your help. Now I understand what I did wrong :)

Answer 2

[Image Analyst]

In Numer_of_zonesEditFieldValueChanged you have

app.Lamp.Color='r';

and

app.Lamp.Color='green';

so it's quite possible that changing the number of zones will change the lamp color.

The field cannot be empty. Your app does not allow it. It must have something there so you don't need to check for the empty condition.