how to number selections in listbox?

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Jihad Chamseddine
Jihad Chamseddine 2014-7-22
评论： Joseph Cheng 2014-7-30
hi, I have a listbox and its selections, when i click on the Add layer, a selection will be added in the listbox, now what i want is how to get that selection numbered so when I enter a name of a layer, it will automatically show 1.name of layer etc...... hope you can hekp me guuys and below there's an image so that you can understand well what i want thanks
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Geoff Hayes
Geoff Hayes 2014-7-22
Where do you enter a name of the layer? Or, do you just mean how to number the layers when you press the Add New Layer button?
Jihad Chamseddine
Jihad Chamseddine 2014-7-22
when I click on the add layer, another window opens and asks me for the name of the layer, and when i enter the name, it will be listed in the listbox, so what i want is that it can be listed and numbered automatically in the listbox(1.first layer 2.second layer etc...)

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回答（1 个）

Joseph Cheng
Joseph Cheng 2014-7-22
In your latest comment why not in the"add new layer" button callback get the number of entries already in the list box
NumEntries=length(get(handles.listbox1,'String'));
then concatenate the new one with
newlist = [get(handles.listbox1,'String'); {['layer ' num2str(NumEntries+1)]}];
set(handles.listbox1,'String',newlist)
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Jihad Chamseddine
Jihad Chamseddine 2014-7-30
now when i add a layer, the only thing that appears are the numbers but the name of the layer doesnt appear
Joseph Cheng
Joseph Cheng 2014-7-30
Can you supply a snippit of code? What is the line that you are using to set? How am i supposed to help. It is like me asking you why i have no water in my cup without showing you my cup. perhaps i didn't put water in it. Or maybe i have a big hole in it. Or maybe its not my cup.
Why don't you start by double checking whether you're converting the number to a string so you're not making a mishmash of string and number array. That what you're setting to the list box is the correct cell. the debug debugging tool is a good start. put a breakpoint at where you've just created the new list box items and then see what you're writing. is it just numbers.

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