How to change text in a textbox from a pushbutton's callback?

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Faith Huynh 2016-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/292159-how-to-change-text-in-a-textbox-from-a-pushbutton-s-callback

评论： rocketboyjka 2016-6-27

I have a GUI that is supposed to create a folder of shortcuts in a certain file. I would like to be able to have a button called "change destination" that, in its callback, should bring up a file directory and allows the user to choose a destination for the shortcut folder, then updates a textbox to show the new destination path.

function [OUT] = action(IN)
      switch(IN)
      case 'change' 
          dest = uigetdir;
          set(handles.destination,'String',dest);
      end
end

When I run the above (action() is called in my GUI's callback for the pushbutton 'change'), I get an error saying that destination (the handle for my textbox) is an undefined variable.

Can anyone tell me what I'm doing wrong? Thank you!

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Answer 1

rocketboyjka 2016-6-24

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https://ww2.mathworks.cn/matlabcentral/answers/292159-how-to-change-text-in-a-textbox-from-a-pushbutton-s-callback#answer_226637

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1) Try passing 'handles' into the function:

action(IN,handles)

2) It is also good practice (I don't think your function requires it, but I usually do it so as not to forget.) to end the function with an update to the handles structure. Typically:

guidata(hObject,handles)

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Faith Huynh 2016-6-27

Hey there,

Awesome, thanks for the tip-- I've never worked with GUIs before, so this is all new. I added handles to the inputs, but I'm not sure where to go from there.

rocketboyjka 2016-6-27