Get listbox into textbox
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Hi, I want to get values from listbox to insert textbox by adding sentence.:
I have cities in listbox(milano, atina, istanbul, amsterdam)
When I choose amsterdam, sholud be shown in the textbox "Selected city is Amsterdam"
Next I choose milano, sholud be shown in the textbox "Selected cities is Amsterdam, Milano"
Next I choose istanbul, sholud be shown in the textbox "Selected cities is Amsterdam, Milano, İstanbul"
I try but I only know "string" and "value" command so I can't solve how to add directly string text and adding to each other. thanks for interest.
city=get(handles.listbox1,'string');
set(handles.edit1,'string',city);
采纳的回答
Here's the modern uifigure/appdesigner style way:
u = uifigure;
lst = uilistbox(u, 'Multiselect', true, 'Position', [50 50 100 300], 'Items', ["Amsterdam" "Milano" "Istanbul" "Natick"]);
txt = uieditfield(u, 'Position', [175 325 300 25]);
lst.ValueChangedFcn = @(~,~)set(txt, 'Value', "Selected cities are: " + string(join(lst.Value,', ')));
Here's the classic figure/guide/uicontrol style way:
f = figure;
lst = uicontrol(f, 'Style','listbox', 'Max',2, 'Position', [50 50 100 300], 'String', ["Amsterdam" "Milano" "Istanbul" "Natick"]);
txt = uicontrol(f, 'Style', 'edit', 'Position', [175 325 300 25]);
lst.Callback = @(~,~)set(txt,'String', "Selected cities are: " + join(lst.String(lst.Value),', '));
4 个评论
Vatan Tosun
2021-10-8
编辑：Vatan Tosun
2021-10-8
Dave B
2021-10-8
Ah I think you mean that you want to keep track of the existing names on each click rather than allowing the user to select multiple names?
I'd suggest you store the names somewhere other than the string in the textbox, but it's not really essential:
u = uifigure;
lst = uilistbox(u, 'Position', [50 50 100 300], 'Items', ["Amsterdam" "Milano" "Istanbul" "Natick"]);
txt = uieditfield(u, 'Position', [175 325 300 25], 'Value', "Selected cities are: ");
lst.ValueChangedFcn = @(~,~)updatestring(lst,txt);
function updatestring(lst,txt)
if txt.Value=="Selected cities are: "
txt.Value = txt.Value + string(lst.Value);
else
txt.Value = txt.Value + ", " + string(lst.Value);
end
end
What should happen if the user clicks the same element twice? should it appear twice? If you make an app in app designer (or just a class for this app) then you can just make a private property to hold the selected cities, this gives you a place to take the unique values and set the string. Here's what the app's code view might look like after adding in the property and callbacks (note that most of this is auto-generated by App Designer, I just filled in the ListBoxValueChanged method and the SelectedCities property):
classdef app1 < matlab.apps.AppBase
% Properties that correspond to app components
properties (Access = public)
UIFigure matlab.ui.Figure
ListBox matlab.ui.control.ListBox
ListBoxLabel matlab.ui.control.Label
EditField matlab.ui.control.EditField
EditFieldLabel matlab.ui.control.Label
end
properties (Access = private)
SelectedCities (:,1) string
end
% Callbacks that handle component events
methods (Access = private)
% Value changed function: ListBox
function ListBoxValueChanged(app, event)
value = app.ListBox.Value;
app.SelectedCities = unique([app.SelectedCities; string(value)]);
app.EditField.Value = "Selected cities are: " + app.SelectedCities.join(", ");
end
end
% Component initialization
methods (Access = private)
% Create UIFigure and components
function createComponents(app)
% Create UIFigure and hide until all components are created
app.UIFigure = uifigure('Visible', 'off');
app.UIFigure.Position = [100 100 640 480];
app.UIFigure.Name = 'MATLAB App';
% Create EditFieldLabel
app.EditFieldLabel = uilabel(app.UIFigure);
app.EditFieldLabel.HorizontalAlignment = 'right';
app.EditFieldLabel.Position = [198 426 56 22];
app.EditFieldLabel.Text = 'Edit Field';
% Create EditField
app.EditField = uieditfield(app.UIFigure, 'text');
app.EditField.Position = [269 426 358 22];
% Create ListBoxLabel
app.ListBoxLabel = uilabel(app.UIFigure);
app.ListBoxLabel.HorizontalAlignment = 'right';
app.ListBoxLabel.Position = [27 426 48 22];
app.ListBoxLabel.Text = 'List Box';
% Create ListBox
app.ListBox = uilistbox(app.UIFigure);
app.ListBox.Items = {'Amsterdam', 'Milan', 'Istanbul', 'Natick'};
app.ListBox.ValueChangedFcn = createCallbackFcn(app, @ListBoxValueChanged, true);
app.ListBox.Position = [90 376 100 74];
app.ListBox.Value = 'Amsterdam';
% Show the figure after all components are created
app.UIFigure.Visible = 'on';
end
end
% App creation and deletion
methods (Access = public)
% Construct app
function app = app1
% Create UIFigure and components
createComponents(app)
% Register the app with App Designer
registerApp(app, app.UIFigure)
if nargout == 0
clear app
end
end
% Code that executes before app deletion
function delete(app)
% Delete UIFigure when app is deleted
delete(app.UIFigure)
end
end
end
Vatan Tosun
2021-10-8
Dave B
2021-10-8
Yeah I can see how that would be confusing. I'm guessing you might run into other problems if you made the class name and filename match (the class name is the app1 bit right after classdef, and the filename is...well...the name of the file that you save it as). I was thinking you'd be making this in App Designer.
I included what all of my App Designer code looked like, but most of it was autogenerated and not editable.
The steps would look like:
- Create an app in App Designer
- Add ListBox and EditField components interactively in the Design View
- Switch to Code View
- Look for the 'Code Browser', select 'Callbacks' and hit the + (or click Callback in the toolstrip)
- Choose the ListBox component (or whatever you named the ListBox)
- (you can give your callback function a custom name if you like) Click Add Callback
- Now you can edit code for the callback, this is where you'd add the stuff in my ListBoxValueChanged above
- Back in Code Browser, click Properties and then the + (or click Property in the toolstrip), this will add a new private property.
- You can name it how you like (I chose SelectedCities), and you can also constrain the shape and type as I did (up to you!)
Sorry that looks like a lot of steps, but it really only takes like 30 seconds when you've done this kind of thing before!
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