MATLAB: How to clear all the text in all TextArea components in App Designer

MATLAB

I have an app with many TextArea components in my app created with MATLAB R2019a.

I would like to design a 'clear' button with a callback function which can clear all the text in the TextArea.

I know how to clear the text for each TextArea component one-by-one. However, because I have many TextArea components, I am looking for a programmatic way to clear all TextArea components.

How do I do that?

Best Answer

Try the follow command:

h=findall(app.mainWindow,'Type','UITextArea');
for i=1:numel(h)
    h(i).Value='';
end

The 'findall' functions find all the handle of the UITextArea components. And you can loop through all the handles to set the value as empty.

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MATLAB: How to disable Edit Field (Text) in App Designer

Here is an example to show how to control Editable about "Edit Field (Text)".

     function SwitchValueChanged(app, event)
              value = app.Switch.Value;
              if ( strcmpi(value,'On') )
                  app.VelocityEditField.Enable = 'On'
                  app.TemperatureEditField.Editable = 'On'
  %                 app.LoadEditField.Editable = 'On'
              else
                  app.VelocityEditField.Enable = 'Off'
                  *app.TemperatureEditField.Editable = 'Off'*
  %                 app.LoadEditField.Editable = 'Off'
              end
          end

This is the captured image to show the result of the above example. It is set so that editing is not possible at Temperature where Editable is off.

MATLAB: App designer Textarea issue

Did you try to use a char instead of string to show the results in textarea?

app.PredikcianruTextArea.Value = char(app.strp);

This might work. I am not really sure if textarea works with strings or chars, but I would say it is the latter.

PS: I did an app with a textarea and I used it as a means to give feedback regarding the application processes. If I remember correctly, I transformed the strings in chars before assigning them to TextArea.Value. Tomorrow I will look for the code and put it here :)

EDIT: This is the code. Note that the message is defined as char. The circshift is to shift the message to the top position of the textarea

feedback{end+1,1} = 'Connected to PNA';
feedback = circshift(feedback,1);
app.Log.Value = feedback;

Best Answer

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MATLAB: How to disable Edit Field (Text) in App Designer

MATLAB: App designer Textarea issue

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