Why do my EditField / TextArea not get updated?

Question

Blanca R. 2020-10-26

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/626898-why-do-my-editfield-textarea-not-get-updated

评论： Blanca R. 2020-10-27

采纳的回答： Mario Malic

在 MATLAB Online 中打开

Hello everyone,

I am currently writing an app with AppDesigner to plot some variables.

I have a ListBox containing the variable names I have listed in a table. In that table I also have the path information of the variable.

I am trying to display that path information in a TextArea or in an EditField, however they stay empty.

I've tried to solve this with these lines in the ListBox-function

function VariablesListBoxValueChanged(app, event)
    app.VariablesListBox.ItemsData = 1:length(app.VariablesListBox.Items);
    SelectNum = app.VariablesListBox.Value;
    load s; % s is the table which I already loaded with another button
    SelectPath = s.Y(SelectNum).Path;
    set(app.VariableTextLabel, 'Text', SelectPath);
    app.VariablePathTextArea.Value = SelectPath
    save SelectNum;
    save SelectPath;
end

and with these ones in the PushButton-function

function ShowButtonPushed(app, event)
    load s;
    load SelectNum;
    load SelectPath;
    set(app.VariableTextLabel, 'Text', SelectPath);
end

but nothing seemes to be working.

I am very helpful for every piece of advice. Many thanks in advance!

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Answer 1

Mario Malic 2020-10-26

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https://ww2.mathworks.cn/matlabcentral/answers/626898-why-do-my-editfield-textarea-not-get-updated#answer_525073

编辑：Mario Malic 2020-10-27

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The save command saves your workspace into file called SelectNum, maybe without file format, I can't verify this now.

You can have SelectPath as a property of the application, declare it at the beginning and change the line in the first callback to

app.SelectPath = s.Y(SelectNum).Path;

In the second callback, this should do it.

function ShowButtonPushed(app, event)
    app.VariablePathTextArea.Value = app.SelectPath % This updates the text area (white space)
    % app.VariableTextLabel.Text = SelectPath % This updates label (description)
end

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Mario Malic 2020-10-27

编辑：Mario Malic 2020-10-27

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Correct, I forgot to add the "app." part.

Did you put the correct handle to the component? If you click on the component, you can see its name in component browser. Is the component editable, are you sure you aren't writing in white font? It may sound silly, but these commands should work.

Does below outputs the correct value?

app.VariablePathTextArea.Value

Blanca R. 2020-10-27

在 MATLAB Online 中打开

Somehow, it works if I write the lines in the first callback! I also saved the table data of the table "s" as a property of the application. And it works without problems for the features EditField, TextArea as well as in a Label. I still don't know why it doesn't work in a PushButton-Callback, but I can work with this!

The code for displaying the path-information of a table and updating it when selecting a new item in a ListBox look now like this:

function VariablesListBoxValueChanged(app, event)
    app.VariablesListBox.ItemsData = 1:length(app.VariablesListBox.Items);
    SelectNum = app.VariablesListBox.Value; % SelectNum = index of the selected item
    app.SelectPath = app.s.Y(SelectNum).Path; % get the path information out of the table called "s" 
    % display the information every time a new item of the ListBox gets selected
    app.VariablePathTextArea.Value = app.SelectPath; % display it in a TextArea 
    app.VariablePathLabel.Text = app.SelectPath; % display it in a Label 
    app.VariablePathEditField.Value = app.SelectPath; % display it in an EditField 
end