How to read data for button in app designer using MATLAB

Question

Vahini Polishetty 2024-4-16

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https://ww2.mathworks.cn/matlabcentral/answers/2107681-how-to-read-data-for-button-in-app-designer-using-matlab

评论： Vahini Polishetty 2024-4-17

EB.mlapp

I have created an app, I'm able to generate 'N' number of tabs for the given input. I'm able to add editfields, dynamic input boxes and buttons to those tabs. My question is after entering numeric values in the dynamic input boxes and clicking on enter i want to generate again those many dynamic input boxes for each input numeric value. Example:If i give number of election boxes as '5', i'm able to generate that many tabs. In those tabs i added election box no., number of partys, and different age group people for each party. I'm able to generate dynamic input boxes also. In different age group people for each party i have generated dynamic boxes. In those boxes if i enter some value '3' and '2' in each input box and click enter i should generate again those many input boxes with respective to the value of each input box.

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Rik 2024-4-17

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Answer 1

Pratyush Swain 2024-4-17

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EB.mlapp

Hi Vishuka,

After going through your shared code, I added an extra property named DynamicInputBoxes_2 in order to store the values of age groups for each of the party. It is an 2D cell array because each party in a tab will contain its own set of age groups. I also added a button as for receiving the number of different age groups for different parties and accordingly added a callback function as follows:

function enterButtonPushed_3(app, tab, ElectionBox)
       % Creating UILabel %
       uilabel(tab, ...
        'Text', 'Enter age grps for each Party:', ...
        'Position', [40, 325, 350, 22]);
       % Read Num of parties for current tab%
       numParties = app.editFields(ElectionBox).Value;
       
       % Create a 2D cell array to store age group for each party %
       app.DynamicInputBoxes_2{ElectionBox} = cell(1,numParties);
       initialPosition = [50, 320 , 50, 22];
       
       % Iterate for each of the party %
       for j = 1:numParties
           initialPosition = initialPosition + [(j-1)*70,0,0,0];
           numAgeGrps = app.DynamicInputBoxes_1{ElectionBox}(j).Value;
           app.DynamicInputBoxes_2{ElectionBox,j} = gobjects(1,numAgeGrps);
           % Dynamically create input boxes for each age group for each party %     
           for k = 1:numAgeGrps
                fieldPosition = initialPosition +[0,-(k)*30, 0, 0];
                app.DynamicInputBoxes_2{ElectionBox,j}(k) = uieditfield(tab,'numeric','Position', fieldPosition);   
           end
           
           % In the end include a import from excel button to read age
           % group data from excel file
           if numAgeGrps > 0
             uibutton(tab, 'push', ...
            'Position', initialPosition + [0,-(numAgeGrps+1)*30,0,0], ...
            'Text', 'Imp.Excel', ...
            'ButtonPushedFcn', @(btn,event) fillDataFromExcel(app, ElectionBox, j));
           end 
       end
end   

In your original query, you also had mentioned regarding importing values for age groups. Assuming you wanted to import age group values for each party separately , I created a fillDataFromExcel as follows:

        function fillDataFromExcel(app, ElectionBox, partyId)
            % Prompt User to select Excel File%
            [file, path] = uigetfile({'*.xlsx';'*.xls'}, 'Select an Excel file');
            if isequal(file,0) || isequal(path,0)
                warning('Invalid File');
                return;
            else
                excelFilePath = fullfile(path, file);
            end
            %Assuming a single column data in the excel file (As this
            % function can be invoked for each party) %
            data = readmatrix(excelFilePath, 'Range', 'A:A');
            
            numAgeGrps = app.DynamicInputBoxes_1{ElectionBox}(partyId).Value;
              
            % Checking data points of input boxes vs Excel column %
            if numAgeGrps ~= numel(data)
                warning('The number of data points in the Excel file does not match the number of input boxes.');
                
            end
            
            % Filling in the Data %
            for k = 1:min(numAgeGrps, numel(data))
                app.DynamicInputBoxes_2{ElectionBox, partyId}(k).Value = data(k);
            end            
        end  

Finally below are some outputs of the app working suiting your use case - (dynamic input box creation & import from excel).

The excel data used to fill age group for party-1 is as follows:

I have attached the source code with this post. I hope this modifications will be helpful for your usecase. Please note this is only a proof of concept prototype and it may need further UI modification or any missing/edge case analysis.

For more information on appdesigner,please refer to https://www.mathworks.com/help/matlab/app-designer.html