MATLAB: Updating one popup menu instantly after a string is chosen in another popup menu

popup menuupdate

I have three popup menus, the first which is to select a country. I want to set that when a country is chosen, the second popup menu will automatically go to the cities for that country . and after the city is chosen the third popup menu will fill with the airports of that city. I want all these changes at the same menu, and without the need of using refresh pushbutton. is that possible?

I would really appreciate if you help me with my problem.

Best Answer

Yes, each popup is a uicontrol(), and each uicontrol may have a callback function. The action of one callback can be to set() the 'String' of another uicontrol so that it has a different selection of popup entries.

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MATLAB: Pop-Up menu help

Vlad - assuming that you are using GUIDE to create your GUI, suppose your five popup menus are named popupmenu1, popupmenu2,..., popupmenu5. If we assume that only numeric data has populated each of your popup menus, then the callback for your push button would look something like

 function pushbutton1_Callback(hObject, eventdata, handles)
 % get the list of items in the first popup menu
 menu1List = get(handles.popupmenu1,'String');
 % get the selected item in the first popup menu and convert to a number
 menu1Item = str2num(menu1List{get(handles.popupmenu1,'Value')});

You would then just repeat the above code for the remaining four popup menus and do whatever operation you need against them.

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When the pushbuttons are created, have the first one be set to 'enable', 'on', and the others set to 'enable', 'off'. Then in the callback for the first push button, if the circumstances are appropriate, set() 'enable', 'on' for the other 4 buttons.

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