Selecting multiple items from combobox

Question

Pls i want to know how to change the selectionmodel of javafxml combobox so that it can allow multiple seletion. Any contribution will be appreciated thanks.

Answer 1

I know this is an old post, but here is just a minimalist working solution as described by @user82426 comment with the 'joining' part suggested. This was built using, as mentioned, http://javawiki.sowas.com/doku.php?id=javafx:combobox-multi-selection.

As stated it's not a COMBOBOX, but a MENUBUTTON... Nevertheless it does fill the needs I was looking for better than a COMBOBOX, so I thought it could help other ;-)...

Here it is :

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.CheckMenuItem;
import javafx.scene.control.ListView;
import javafx.scene.control.MenuButton;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import java.util.Arrays;
import java.util.List;

public class MultiSelectionComboDemo extends Application {
    final ListView selectedItems = new ListView<>();
    
    @Override
    public void start(Stage primaryStage) {
        final String sMenuTextStart = "Fruit : ";
        final String sMenuTextEmpty = "[empty]";
        final MenuButton            choices = new MenuButton(sMenuTextStart+sMenuTextEmpty);
        final List   items   = Arrays.asList(new CheckMenuItem("Apple"), new CheckMenuItem("Banana"), new CheckMenuItem("Pear"), new CheckMenuItem("Kiwi"));
        choices.getItems().addAll(items);
        
        for (final CheckMenuItem item : items) {
            item.selectedProperty().addListener((observableValue, oldValue, newValue) -> {
                if (newValue) {
                    selectedItems.getItems().add(item.getText());
                } else {
                    selectedItems.getItems().remove(item.getText());
                }
                String sMenuText = sMenuTextStart + (selectedItems.getItems().size()>0?"":sMenuTextEmpty);
                choices.setText(sMenuText+String.join(", ", selectedItems.getItems()));
            });
        }
        
        BorderPane borderPane = new BorderPane();
        borderPane.setTop(choices);
        borderPane.setCenter(selectedItems);
        primaryStage.setScene(new Scene(borderPane, 400, 300));
        primaryStage.show();
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}