GUI: Change backround of "Edit text" box using if structure

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Hello! In my GUI I have two inputs and output (they are "Edit text" boxes) and a button which executes a function. As I said, the final output goes to Edit Text box. I want to analyze this output with if structure, and, depending on the value, assign different background color for the box.
I tried using set(hObject,'BackgroundColor','color'), (example below) And it worked..
function box_CreateFcn(hObject, eventdata, handles)
But when it is inside IF structure, MATLAB returns many errors and code doesn't work (see code below)
function box_CreateFcn(hObject, eventdata, handles)
if value <-30
elseif value>=-30
elseif value<=100
What am I doing wrong? :)
  1 Comment
Jan on 26 Nov 2012
When ever you mention, that errors appear, it is a good idea to post the messages also.

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Accepted Answer

Arthur on 26 Nov 2012
Explain 'many errors'. How can we fix many errors with we don't know what they are?? I'm going to make an estimated guess. If your code is exactly as you showed here, than you forgot to get the string of the textbox. Include this above your if.
value = str2double(get(hObject,'String'))
Also, the way you programmed your if's is not going to work; it will never reach the last two options. Note that matlab always goes to the first if that is true, and value will always be <-30 or >=-30....
Arthur on 27 Nov 2012
Edited: Arthur on 27 Nov 2012
Well, when even the code in your question isn't the correct one, I don't know how we can help you. You'll have to give us some more info (=errors & code).
But I see that this code is in the CreateFcn. Shoudn't it be in the Callback?

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More Answers (1)

Image Analyst
Image Analyst on 26 Nov 2012
Edited: Image Analyst on 26 Nov 2012
Have you tried to use the debugger? Set a breakpoint and see if it actually gets into any of the "if" conditions that you list.
And what is "value" - have you assigned that yet?
And you can try using instead of hObject.


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