List box Value Changed

Question

Nwasinachi 2022-11-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1858908-list-box-value-changed

评论： Voss 2022-11-22

This exact function works for my 1st list box i turned off 'enable' and set a condition that forces a selection to be made from list box so the push button is enable, but that isnt working for the other pushbuttons. i have attached the code

function ListBox_3ValueChanged(app, event)
            value = app.ListBox_3.Value;
      if strcmp(app.ListBox.Value,'Female')|| strcmp(app.ListBox.Value,'Male')||strcmp(app.ListBox.Value,'Intersex')||strcmp(app.ListBox.Value,'Non-conforming')...
                    ||strcmp(app.ListBox.Value,'Gender-fluid')||strcmp(app.ListBox.Value,'Genderqueer')||strcmp(app.ListBox.Value,'Transgender');
          set(app.NEXTButton_2,'Visibility','on')
                set(app.NEXTButton_2,'Enable','on');
            end % simple loop that allows the push button to stay disabled until the person selects an option.
        end

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Nwasinachi 2022-11-22

在 MATLAB Online 中打开

Final.mlapp

I am not sure why it only works for the 1st tab and not the 2nd. The are under the same function, but for different lust box and i have checked several times to make sure the push button is turned off, but it still doesnt work.

The part to select or change would be:

function ListBox_3ValueChanged(app, event)
            value = app.ListBox_3.Value;
      if strcmp(app.ListBox.Value,'Female')|| strcmp(app.ListBox.Value,'Male')||strcmp(app.ListBox.Value,'Intersex')||strcmp(app.ListBox.Value,'Non-conforming')...
                    ||strcmp(app.ListBox.Value,'Gender-fluid')||strcmp(app.ListBox.Value,'Genderqueer')||strcmp(app.ListBox.Value,'Transgender');
          set(app.NEXTButton_2,'Visibility','on')
                set(app.NEXTButton_2,'Enable','on');
            end % simple loop that allows the push button to stay disabled until the person selects an option.
        end

If i can figure out why this isn't working then i can make adjustment to my other tabs because they have a similar format

I have read the tutorial, thank you for attaching that.

Image Analyst 2022-11-22

I can't even get it to display the tabs. When I run it, they're chopped off. Look:

You see the tabs in Design View but when you actually run it the top part of the figure is chopped off!

Nwasinachi 2022-11-22

编辑：Nwasinachi 2022-11-22

Final.mlapp

I just made a modification it should run well now and resize decently

They are that way because of a resizing issue. App designer has a very complicated sizing criteria, so i am unable to use percentages to size the page and using pixels causes my app to lose pushbuttons (not visible on the screen when it is resized). i have been trying different codes to fix that issue but StartFcn makes the other functions non-functional so i had to remove that line of code.

You can still run the app. if you click on NEXT it should proceed to the next tab. If it isnt working please let me know.

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Answer 1

Voss 2022-11-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1858908-list-box-value-changed#answer_1108578

编辑：Voss 2022-11-22

NEXTButton_2 has no Callback (i.e., no ButtonPushedFcn) assigned to it.

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Voss 2022-11-22

编辑：Voss 2022-11-22

在 MATLAB Online 中打开

Also, in ListBox_3ValueChanged, you are checking the value of app.Listbox, not the value of app.ListBox_3:

function ListBox_3ValueChanged(app, event)
    value = app.ListBox_3.Value
    if strcmp(app.ListBox.Value,'Female')|| strcmp(app.ListBox.Value,'Male')||strcmp(app.ListBox.Value,'Intersex')||strcmp(app.ListBox.Value,'Non-conforming')...
            ||strcmp(app.ListBox.Value,'Gender-fluid')||strcmp(app.ListBox.Value,'Genderqueer')||strcmp(app.ListBox.Value,'Transgender');
        set(app.NEXTButton_2,'Enable','on');
    end % simple loop that allows the push button to stay disabled until the person selects an option.
end

and app.Listbox will never satisfy any of those Gender selection conditions because it is the Age listbox.

Anyway, you can change it to be analogous to the code in my previous comment:

function ListBox_3ValueChanged(app, event)
app.NEXTButton_2.Enable = ~isempty(app.ListBox_3.Value);
end

Same for ListBox_4ValueChanged:

function ListBox_4ValueChanged(app, event)
app.NEXTButton_3.Enable = ~isempty(app.ListBox_4.Value);
end

Nwasinachi 2022-11-22

So the list boxes that i have posted in this thread are components of User Interface i am creating.

The user is supposed to make a selection as they go through each tab.

The struct array is there so i can collect those inputs(answers) which are either from the radio buttons or list boxes, because i will have to compute some statistical analysis later, but if i am unable to have the inputs saved for each user then this analysis is almost impossible to do.

Voss 2022-11-22

For reference, new question related to this topic:

https://www.mathworks.com/matlabcentral/answers/1859968-values-of-selected-item-in-list-box-moved-into-a-struct

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List box Value Changed

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