warning for not filled fields in guide

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Radoslav Vandzura 2015-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/253768-warning-for-not-filled-fields-in-guide

评论： Image Analyst 2015-11-9

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Hello All,

I would like to ask you how can I make warning for not filled fields in guide? I want when someone doesnt fill fields, warning will appear at the screen? How should I do it?

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Answer 1

Image Analyst 2015-11-8

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https://ww2.mathworks.cn/matlabcentral/answers/253768-warning-for-not-filled-fields-in-guide#answer_198969

在 MATLAB Online 中打开

You have to get the fields that you want to check, then use isempty() or length() or something to see if there is anything there

editField = get(handles.edit1, 'String');
if isempty(editField)
    message = sprintf('Warning: edit1 is not allowed to be empty!');
    uiwait(warndlg(message));
end

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Radoslav Vandzura 2015-11-8

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Is any way according can I do it together for all fields?

Image Analyst 2015-11-9

You're sort of doing it right - once for every field. After all, it's a GUI and there will be just a small, finite number of fields - it's not like there will be thousands of them.

One thing you're doing wrong however is passing the result of get() into str2num(). If the field is empty that will most likely cause an ugly error. It's better to check first and present the user with "friendly" instructions like in my code.

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