How can I sort(delete) contents in listbox?

Question

Haksun Lee 2012-6-7

0
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https://ww2.mathworks.cn/matlabcentral/answers/40540-how-can-i-sort-delete-contents-in-listbox

Hello! I use listbox, and can add items to listbox and have to delete items from listbox. In case of adding, it works properly, but in case of delete & sort, it doesn't work ..! What's the problem with the code below?

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%adding items to listbox

function pushbutton3_Callback(hObject, eventdata, handles)

oldList = get(handles.listbox1,'string');

newVal = PacketContent.title;

newList = [oldList; newVal];

%sort item

function pushbutton5_Callback(hObject, eventdata, handles)

newList_sorted=sort(newList);

set(handles.listbox1,'string',newList_sorted);

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Answer 1

Titus Edelhofer 2012-6-7

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Hi Haksun,

in your pushbutton5_Callback you need to define newList, e.g.

newList = get(handles.listbox1, 'string');

before doing the sort.

Edit: And what about delete? Pretty much the same

newList = get(handles.listbox1, 'string');
% e.g. remove Nr. 2
newList(2) = [];
set(handles.listbox1, 'string', newList, 'value', 1);

Note: you should always set the value to e.g. 1, because if you delete the last of newList, the value will be length(newList)+1, i.e., out of range (you will see this by a warning and a disappearing listbox).

Titus