Saving input from a textarea to a workspace variable

Question

Aliki Papoutsi 2022-3-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1676209-saving-input-from-a-textarea-to-a-workspace-variable

回答： Voss 2022-3-20

I want to code a popup window with a text area and a save button, which when clicked will save the text area contents in the form of a (list) string array in the workspace.

This is the code I have so far:

fig = uifigure('Position',[500 500 430 275]);

label1 = uilabel(fig,...

'Position',[125 200 100 15],...

'Text','Start Scanning');

textarea = uitextarea(fig,...

'Position',[125 100 150 90],...

'ValueChangedFcn',@(textarea,event) textEntered(textarea, label2));

save_pushbutton = uicontrol('Parent', fig,'Style','pushbutton','Callback',@save_callback,...

'String','Save',...

'FontSize',8,...

'Units', 'normalized', 'Position',[.15 .05 .1 .05]);

function save_callback(hObject, eventdata)

x = get(textarea,'String');

save('SCAN.mat');

end

And I am getting the error message that 'textEntered' is not recognized. I would like to know why and if there are any other errors in my code.

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Walter Roberson 2022-3-20

You have not shown us any function named textEntered

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Answer 1

Voss 2022-3-20

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1676209-saving-input-from-a-textarea-to-a-workspace-variable#answer_922624

在 MATLAB Online 中打开

'textEntered' is not recognized because it is specified as the 'ValueChangedFcn' of textarea here:

textarea = uitextarea(fig,...
    'Position',[125 100 150 90],...
    'ValueChangedFcn',@(textarea,event) textEntered(textarea, label2));

but it is not defined anywhere.

Does textarea need a 'ValueChangedFcn'? If so, define it. If not, leave that unspecified when textarea is created:

textarea = uitextarea(fig,...
    'Position',[125 100 150 90]);

Other errors:

You can't create a uicontrol in a uifigure. Use uibutton() to create a pushbutton in a uifigure.
In save_callback(), the variable textarea will not be recognized (unless save_callback() is actually nested inside another function that contains textarea, but that does not appear to be the case here).
A uitextarea does not have a 'String' property. Use the 'Value' property.

Fixing those few things, and assigning to a variable in the base workspace rather than saving to a mat file, the code might look like this (untested):

function save_text_dlg()
    
    fig = uifigure('Position',[500 500 430 275]);
    label1 = uilabel(fig,...
        'Position',[125 200 100 15],...
        'Text','Start Scanning');
    textarea = uitextarea(fig,...
        'Position',[125 100 150 90]);
    save_pushbutton = uibutton( ...
        'Parent', fig, ...
        'ButtonPushedFcn',@save_callback,...
        'Text','Save',...
        'Position',[64 13 64 20]);
    
    function save_callback(varargin)
        assignin('base','x',get(textarea,'Value'));
    end
    
end