clear listbox in gui

I have a listbox in gui that display the result of execution... when I want to run another time I want the past resut in listbox to be removed and display the message(please wait the result)and then the new result is display i just dont know how to clear the listbox and display that message.

Answer 1

[Image Analyst]

Did you try to set it to null?

handles.listbox1.String = [];

[marwa marwan]

it didnt work

[Image Analyst]

Yes it does. I just tried it myself to make sure. It works fine. It immediately clears out the listbox.

Are you sure the tag property of your listbox is used right after "handles." and before ".String"? Yours is probably not named listbox1 so make sure you use the right name.

Otherwise, post your m-file and .fog file so I can replicate the strange, inexplicable behavior of your GUI.

[marwa marwan]

thanks for your interest..i solved it by using waitbar when the program is under execution and then the result is appear in listbox..thus there is no need to delete the past execution. I appreciate your help

[Image Analyst]

Using a waitbar is not required for clearing a listbox. That's a totally separate issue. Perhaps you cleared it and immediately went into a computationally intensive loop and so the screen did not refresh. To have it refresh immediately, use drawnow.

handles.listbox1.String = [];
drawnow;

[marwa marwan]

I know its separate issue but I just didnt know why my list box didnt refreshed so I used wait bar just to knowledge the GUI user that the program is under execution thank you for explination that is exactly what I want..

Answer 2

[Hossein Davari]

ListBoxHandle.Items = {}; %clear the list of items in listbox

edg = errordlg('Message');

waitfor(edg) %program will continue when the dialog box is closed.

drawnow

[Walter Roberson]

Items is, I suspect, for list boxes in app designer.

[Hossein Davari]

Yes