MATLAB Answers

Scrolling down drop down list

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Khalala Mamouri
Khalala Mamouri on 31 Aug 2020
Edited: Adam Danz on 31 Aug 2020
i am developping an app in app designer, but i am runing out of space for the drop down list. i wonder if there is a way to make a scrolling dropdown list, just like web pages when you want to go further down you just keep clicking on the rectangle think to the right of the screen.
this is my code :
list = load('Vehiclelist.mat');
assignin('base','list', list);
app.VehicleModelDropDown.Items = list.Vehiclelist;
Vehiclelist = [app.VehicleModelDropDown.Items New_Bat_Name];
app.VehicleModelDropDown.Items = Vehiclelist;
%% scroll(app.VehicleModelDropDown.Items,1,1); %% << Somewhere here i want to put the
%% scrolling thing
thank you


Adam Danz
Adam Danz on 31 Aug 2020
I don't believe that's supported, although the dropdown list will automatically create a vertical scroll bar after it gets too long, see Mario Malic's answer below. You could uses a listbox instead. It has a scroll feature and you can set it up to only accept 1 selection.
A more work-intesive method would be to set the max items at 8 (for example) and to set the 8th item in the dropdown list to "see more". When clicked, it loads the next 7 items in positions 1:7 while positon 8 remains "see more". It can circularly shift through the options.
Khalala Mamouri
Khalala Mamouri on 31 Aug 2020
Yes adam, i think it is easier with a list box. Please, is there a way make this list box show only one item, and when clicking on it (interact with ) it shows a list just like the fig bellow
thank you
Adam Danz
Adam Danz on 31 Aug 2020
No, I don't believe that's possible. You could shrink the height so that it only shows 1 item at a time but it will still only show 1 line at a time when scrolling through it.

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Answers (1)

Mario Malic
Mario Malic on 31 Aug 2020
Edited: Mario Malic on 31 Aug 2020
app.DisplayDropDown.Items = app.Legend_Str; % This is cell 1xn that contains char arrays
This works for me. I believe it appears when the items cannot fit the main window.
You don't have scrolling thing because, most likely you did not load all the data.

  1 Comment

Adam Danz
Adam Danz on 31 Aug 2020
+1, yes - once the list gets too long it will automatically add a vertical scoll bar.

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