MATLAB: Get selected value instantly from a listbox without clicking it first

guilistboxMATLAB

I have a listbox on my gui. When I start the programm the first value in the listbox is selected. But the programm only registers a value when you click it first. So is there a way the programm can start my calculation without having to click the first option in the listbox?

A quick fix is to add the command to the OpeningFcn

listbox_Callback(handles.listbox, [], handles);

The problem is: This fix works fine for one listbox, but I have 3 on my gui. So when i add 3 of these commands to my openingfunction i get the error:

Reference to non-existent field

Any ideas how i can fix it?

Best Answer

As long as you filled up your listbox somehow, either in GUIDE or your OpeningFcn(), you can get any item in it without having to have the user click on one. For example to get the second item in listbox #3:

allItemsInListbox3 = handles.listbox3.String;  % Get all items from listbox3.
itemNumber2 = allItemsInListbox3{2};  % Extract only the second item from listbox3.

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MATLAB: How to populate a popup menu GUI from a structure list

You can create the 3 popup menus with GUIDE. You can enter the strings you want them to display also in GUIDE, which is what I think you might mean by "get data into my popup menus". Double click the popup in GUIDE, which brings up the Property Inspector, and edit the String property to enter in the text you want it to display.

Then, in any callback function, you can get the item number that was selected by the user at run-time for each popup like this:

popupValue1 = handles.popup1.Value;
popupValue2 = handles.popup2.Value;
popupValue3 = handles.popup3.Value;

I don't know what "data1.ChannelName" is, or if there are 3 of them. Maybe you want to put the indexes of the popups into the ChannelName fields of 3 different structures. If so, you can do

data1.ChannelName = handles.popup1.Value;
data2.ChannelName = handles.popup2.Value;
data3.ChannelName = handles.popup3.Value;

popup1, popup2, and popup3 are the "tag" properties of the popups that you'll see when you double click the popup in GUIDE, which brings up the Property Inspector.

MATLAB: Set list box

n = 5;
uicontrol('style','list','string',num2cell((1:n).'))

Best Answer

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