Application Designer Access elements on panel

Hello Community,

I've started migrating to the app developer (from GUIDE), and am finding a few questions I can't figure out.

The main one is that I like using Panels to segregate different functions, such as data input in one panel, configuration settings in a different panel etc.

If I read the value in an element (ex. textbox.Text or textbox.Value) I can do that on a callback from a button that is in the same panel.

If I try to access this field from a button callback that doesn't reside in the panel I get "Undefined variable" messages. For example:

In the panel SetupPanel I have a text box named txt-nRuns. If I put a button in the same SetupPanel I can read the value with "nruns=app.txt_nRuns.Value"

If I try to read the value from a button on the main form (or in another panel) I get the "undefined variable" response. It seems like it's treating the elements in the panel as local variables.

I tried different options likeb elow with no luck, any tips on what I'm doing wrong (or if this is not currently possible)?

nruns=app.txt_nRuns.Value

nruns=app.SetupPanel.txt_nRuns.Value

nruns=app.SetupPanel.app.txt_nRuns.Value

nruns=SetupPanel.app.txt_nRuns.Value

Thanks for any suggestions!

[Tommy]

In the following simple example I don't have this problem:

classdef app1 < matlab.apps.AppBase

    % Properties that correspond to app components
    properties (Access = public)
        UIFigure        matlab.ui.Figure
        Panel           matlab.ui.container.Panel
        EditFieldLabel  matlab.ui.control.Label
        EditField       matlab.ui.control.EditField
        Panel2          matlab.ui.container.Panel
        Button          matlab.ui.control.Button
    end

    % Callbacks that handle component events
    methods (Access = private)

        % Button pushed function: Button
        function ButtonPushed(app, event)
            disp(app.EditField.Value)
        end
    end

    % Component initialization
    methods (Access = private)

        % Create UIFigure and components
        function createComponents(app)

            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 640 480];
            app.UIFigure.Name = 'UI Figure';

            % Create Panel
            app.Panel = uipanel(app.UIFigure);
            app.Panel.Title = 'Panel';
            app.Panel.Position = [18 241 260 221];

            % Create EditFieldLabel
            app.EditFieldLabel = uilabel(app.Panel);
            app.EditFieldLabel.HorizontalAlignment = 'right';
            app.EditFieldLabel.Position = [20 159 56 22];
            app.EditFieldLabel.Text = 'Edit Field';

            % Create EditField
            app.EditField = uieditfield(app.Panel, 'text');
            app.EditField.Position = [91 159 100 22];

            % Create Panel2
            app.Panel2 = uipanel(app.UIFigure);
            app.Panel2.Title = 'Panel2';
            app.Panel2.Position = [338 153 260 221];

            % Create Button
            app.Button = uibutton(app.Panel2, 'push');
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed, true);
            app.Button.Position = [21 155 100 22];

            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end

    % App creation and deletion
    methods (Access = public)

        % Construct app
        function app = app1

            % Create UIFigure and components
            createComponents(app)

            % Register the app with App Designer
            registerApp(app, app.UIFigure)

            if nargout == 0
                clear app
            end
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Does this not match what you are trying to do? Can you provide some of your code, or at least enough to be able to reproduce the error?

[Sahithi Kanumarlapudi]

Hi,

As mentioned in the previous comment, that should not be a problem. Could you provide the code so that I can look into it?

[Larry McDermott]

Thanks for your response, everything is working fine now. I'm not sure what I was doing wrong but I've since started using panels with no problems.

Answer 1

[Larry McDermott]

Thanks for the follow up, I've worked around it (by excluding the panels) for now.

I just tried using a simple app and it all works! Not sure what I was doing last time but glad it works, sorry for the false alert!