How do i add search functionality into my drop down menu in my GUI?

I have a GUI that loads data and plots it. I have drop down menus for selecting the parameters to plot. I wanted to add search functionality to the drop down menu. Any suggestions?

[Rishabh Rathore]

Can you elaborate as to search what? Search from existing values for drop down?

[Anuj]

Yes. Search for already loaded data.

Answer 1

[Arsalan jamialahmadi]

You can add en uieditfield called MyEditField to your app and for that apply a "ValueChanging" callback to be able to search your MyDropDown:

changingValue = event.Value;
List=[];
if ~isempty(app.MyEditField)
    for i=1:length(app.OriginalList)
        if contains(app.OriginalList{i},changingValue)
            List=[List,app.OriginalList(i)];
        end
    end
end
if isempty(app.MyEditField)
    List=app.OriginalList; 
end  
if ~isempty(List)
    app.MyDropDown.Items=List;               
end
if isempty(event.Value)
    app.MyDropDown.Items=app.OriginalList;
end
if ~isempty(event.Value) && isempty(List)
    app.MyDropDown.Items={};
end

Answer 2

[Bereketab Gulai]

Here is much Modified of Arsalan jamialahmadi

% Value changing function: TestTypeSearchEditField
function TestTypeSearchEditFieldValueChanging(app, event)
    persistent originalTestTypeList; % save the original list
    if isempty(originalTestTypeList)
        originalTestTypeList = app.TestTypeDropDown.Items;
        pause(0.5); % sync value (in case...)
    end
    
    changingValue = event.Value;
    
    Utility.filterDropdownList(app.TestTypeDropDown, originalTestTypeList, changingValue);
end

In Utility Class (You can create this)

function filterDropdownList(uidropdownControl, originalList, changingValue)
    List=[];
    if ~isempty(changingValue)
        for c = 1:length(originalList)
            if contains(originalList{c},changingValue, "IgnoreCase",true)
                List = [List,originalList(c)];
            end
        end
    end
    
    if ~isempty(List) % Something is found
        uidropdownControl.Items = List;
    elseif ~isempty(changingValue) && isempty(List) % Nothing is found
        uidropdownControl.Items = {};
    else % Restore otherwise
        uidropdownControl.Items = originalList;
        if isempty(uidropdownControl.ItemsData)
            uidropdownControl.Value = originalList{1};
        else
            if isnumeric(uidropdownControl.ItemsData)
                uidropdownControl.Value = uidropdownControl.ItemsData(1);
            else
                uidropdownControl.Value = uidropdownControl.ItemsData{1};
            end
        end
    end
end