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How to make two drop down Dependent

Adrian Quesada さんによって質問されました 2019 年 5 月 29 日
最新アクティビティ Luna
さんによって コメントされました 2019 年 5 月 30 日
I have two drop down on my App Designer app, like this:
DropDown1.Items = {'1','2','3','4','5'};
DropDown1.ItemsData = [1,2,3,4,5];
DropDown2.Items = {'10','20','30','40','50'};
DropDown2.ItemsData = [1,2,3,4,5];
I would like to make this drop down dependent, so, if I choose on the DropDown1 the second option ({'2'}), the DropDown2 display the same position option (the second {'20'}) and so on any position I choose.
Is there any way to make this on App Designer or GUI?

  2 件のコメント

Geoff Hayes
2019 年 5 月 29 日
Adrian - you can probably do something in the callback for the first drop down: when this fires (due to a change in the choice), then update the selected value in the second drop down.
That is what I need, but I don't know how to do it.

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1 件の回答

Luna
Answer by Luna
on 29 May 2019
Edited by Luna
on 29 May 2019
 Accepted Answer

Here is a basic test app I have created.
Please read comments carefully.
classdef testDropDown < handle
properties
dd1 % will be used for dropdown1 handle
dd2 % will be used for dropdown2 handle
end
methods
function obj = testDropDown(obj) % obj is testDropDown obj whose superclasses is handle class
hFig = figure;
%% dropdown1 assigned as a property for testDropDown Class
obj.dd1 = uicontrol('Parent',hFig,'Style','popupmenu','Units','normalized','Position',[0.1 0.3 0.5 0.1],'Callback',@obj.dd1Callback,'String',{'1','2','3'});
%% dropdown2 assigned as a property for testDropDown Class
obj.dd2 = uicontrol('Parent',hFig,'Style','popupmenu','Units','normalized','Position',[0.1 0.1 0.5 0.1],'Callback',@obj.dd2Callback,'String',{'10','20','30'});
end
function dd1Callback(obj,src,evnt) % when clicked on dropdown1 this callback will be executed.
obj.dd2.Value = src.Value; % gets the value of the source(src) which is the object handle of the item that you have clicked on and assignes it to the other dropdown's value.
end
function dd2Callback(obj,src,evnt) % when clicked on dropdown2 this callback will be executed.
% obj is the main class object
% src is the source of that callback executed it can be a button or a dropdown menu item,etc.
% evnt is the event handle that stores the clicking event.
end
end
end
Read more about handle classes you can find lots of information.

  3 件のコメント

Luna
2019 年 5 月 29 日
I have created a manuel classdef, If you are using app designer, the classes must be already defined. You can reach your all uicontrol elements' object instances via handles dot notation inside any callback. For example:
% Value changed function: DropDown
function DropDownValueChanged(app, event) % first dropdown's callback
idx = ismember(app.DropDown.Items,event.Value);
app.DropDown2.Value = app.DropDown2.Items(idx);
end
Below you can see the classdef for automatically generated appdesigner code:
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
DropDownLabel matlab.ui.control.Label
DropDown matlab.ui.control.DropDown
DropDown2Label matlab.ui.control.Label
DropDown2 matlab.ui.control.DropDown
end
methods (Access = private)
% Value changed function: DropDown
function DropDownValueChanged(app, event)
idx = ismember(app.DropDown.Items,event.Value);
app.DropDown2.Value = app.DropDown2.Items(idx);
end
end
.
.
.
Also I recommend to check below links:
Adrian Quesada 2019 年 5 月 29 日
Thank you very much for the answer and the patience to explain it step by step.
Luna
2019 年 5 月 30 日
Your welcome :)

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