Insert an element once in a listbox

Question

Samah EL QASSAH 2017-11-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369531-insert-an-element-once-in-a-listbox

评论： KL 2017-11-27

I wrote the following code that allows me to insert the word "Cab1" in a list once the condition is true

if (Output == 1) 
        str = get(handles.list_Update, 'string'); 
        str = cellstr(str); 
        str{end+1} = 'Cab1'; 
        set(handles.list_Update, 'String', str); 
  end

But I get the result below because the condition "Output = 1" is still true. I want to insert the word "Cab1" only once in the list even if Output remains at 1. Can a Brake help me to solve the problem otherwise how to do it?

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Answer 1

KL 2017-11-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/369531-insert-an-element-once-in-a-listbox#answer_293390

在 MATLAB Online 中打开

Check if your string already existing in your listbox and make output false in that case?

Something like,

if (Output == 1) 
        str = get(handles.list_Update, 'string'); 
        str = cellstr(str);
        if find(ismember(str, 'cab1'))
           output = 0;
        else 
           str{end+1} = 'Cab1'; 
           set(handles.list_Update, 'String', str);
       end 
end