MATLAB: How to set the list box to have no default selection in MATLAB

boxemptyguihighlightlistlistboxMATLABvalue

I would like to set my list box such that none of its items are highlighted upon creation.

I tried using the following code to set the "Value" property of the list box to an empty matrix. However, instead of seeing the desired result, the list box disappears.

item_list = {'L1';'L2';'L3';'L4';'L5'};
h = uicontrol('style','list','Position',[40 40 80 70],...
     'string',item_list, 'Value', []);

Best Answer

You can set your list box to have no selection by setting the 'Value' property to an empty matrix and setting the 'Max' and 'Min' properties to satisfy the following condition:

 Max - Min > 1

The above condition enables multiple selection.

For example:

item_list = {'L1';'L2';'L3';'L4';'L5'};
h = uicontrol('style','list','max',2,...
     'min',0,'Position',[40 40 80 70],...
     'string',item_list, 'Value', []);

Related Solutions

MATLAB: How to select multiple items from a GUI listbox

To select multiple items in a List box the Max and Min properties must be defined. If Max - Min > 1, then list boxes allow multiple item selection. If Max - Min <= 1, then list boxes do not allow multiple item selection. Please refer to the documentation page for Max and Min for the List box in the following link:

https://www.mathworks.com/help/releases/R2017a/matlab/ref/uicontrol-properties.html#property_max

An example for creating a List box that allows multiple item selection is created with the commands below:

txt_cell_array = {'line1';'line2';'line3';'line4';'line5'};
h_list = uicontrol('style','list','max',10,...
   'min',1,'Position',[20 20 80 60],...
   'string',txt_cell_array);

Notice that the UICONTROL function creates the List box, as per its documentation page:

http://www.mathworks.com/help/matlab/ref/uicontrol.html

For a list of additional properties for the UICONTROL please refer to the following documentation page:

https://www.mathworks.com/help/releases/R2017a/matlab/ref/uicontrol-properties.html

Note that if you currently have a List box available, to enable multiple item selection you need to set the Max and Min properties of this List box via its handle.

set(h_list,'Max',2,'Min',0);

The above command allows a maximum number of two selections in the List box with handle "h_list". To dissable multiple item selection on the List box, set the properties as follows:

set(h_list,'Max',1,'Min',0);

MATLAB: Adding Strings to list box so that if two strings are same, a number will be added.

Hi,

(Accept my answer if you found my solution is working for your case, thanks)

Here you go:

Step 1 : Create the said GUI

Step 2 : Create Callback function for Button

Step 3 : Script for the Callback function

or you can copy from here

new=app.EditField.Value;
itemlist = app.ListBox.Items;
match_number=sum(strncmp(new,itemlist,length(new)));
            if match_number == 0
                itemlist{end+1} = new;
                app.ListBox.Items = itemlist;
            else
                new_name = sprintf("%s%i",new,match_number);
                itemlist{end+1} = char(new_name);
                app.ListBox.Items = itemlist;
            end

It is working perfectly. If you have any doubt on the algo, let me know.

Best Answer

Related Solutions

MATLAB: How to select multiple items from a GUI listbox

MATLAB: Adding Strings to list box so that if two strings are same, a number will be added.

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