Get selected value instantly from a listbox without clicking it first

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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?

Accepted Answer

Image Analyst
Image Analyst on 10 Dec 2016
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.
Jan w
Jan w on 17 Dec 2016
I just wanted the value not the string of the listbox. Image Analyst solved my problem. Thanks! :)

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