list box string isn't updated after changes

Hi all, i have created gui with guide.

I have 4 push buttons: add, remove, up, down

the problem is with "add" button. the list box excepts the string from "editbox" and add it between the selected value of the list box

but when i try to add another string it replaces the existing on with the new one.

how can i keep the added string to the list and adding another one without removing the previous?

this is the push button callback

function add_Callback(hObject, eventdata, handles)

editbox = get(handles.edit,{'string'});  %need {} because editbox is a char
Lstring = get(handles.listbox,'string');
Lvalue = get(handles.listbox,'value');

% update the string in the selected place with the editbox data
%Lstring(Lvalue)=[editbox]
Value=Lvalue+1;
 
low=1:Lvalue;
low1=num2str(low');
high=Value:50;
high1=num2str(high');

new = [low1 editbox high1];

set(handles.listbox,'string',new,'value',Value);

Answer 1

[Kevin Phung]

it gets removed because of the way you are building your string.

low=1:Lvalue;
low1=num2str(low');
high=Value:50;
high1=num2str(high');
new = [low1 editbox high1];

you are always setting the strings before and after your selection to be 1:Lvalue and value:50.

I would suggest doing this:

Add editbox string directly below the selection.

function add_Callback(hObject, eventdata, handles)
editbox = get(handles.edit,{'string'});  %need {} because editbox is a char
Lstring = get(handles.listbox,'string');
Lvalue = get(handles.listbox,'value');
% update the string in the selected place with the editbox data
%Lstring(Lvalue)=[editbox]

new = [Lstring(1:Lvalue) editbox Lstring(Lvalue)];
Value = Lvalue+1

set(handles.listbox,'string',new,'value',Value);

let me know if this works for you

[evgeny shumsky]

it wan't working

??? Error using ==> horzcat
CAT arguments dimensions are not consistent.

Error in ==> GUI_final>add_Callback at 103
new = [Lstring(1:Lvalue) editbox Lstring(Lvalue)];

so i changed it a little bit and now every thing works

Value=Lvalue+1;
new = [Lstring(1:Lvalue); editbox; Lstring(Value:end)];

thank you, you have helped me alot