一个组合框中的选定项目如何更改第二个Combobox上的特定项目？ [英] How selected items from one combobox change specific items on second Combobox?

问题描述

Combobox1有3个项目（西班牙，法国，英国）和Combobox2 6个项目（巴塞罗那，马德里，巴黎，马赛，伦敦，布里斯托尔）。
当从Combobox1（西班牙）中选择一个项目时，Combobox2应该可以使用特定项目（巴塞罗那，马德里）。

Combobox1 has 3 items (Spain, France, UK) and Combobox2 6 items (Barcelona, Madrid, Paris, Marseille, London, Bristol). When one item is selected from Combobox1 (Spain) it should be available to Combobox2 the specific items (Barcelona, Madrid).

任何人都可以帮我吗？

Can anyone help me with this?

提前致谢

推荐答案

三个combox监听器示例代码.i认为这个解决方案使用ful来支持你。

Three combox listener example code.i think this solution use ful for your.

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package threecombobox;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

/**
 *
 * @author reegan
 */
public class ThreeComboBox extends Application {

    @Override
    public void start(Stage primaryStage) {

        List combox1List = new ArrayList();
        for (int i = 1; i < 10; i++) {
            combox1List.add(i);
        }

        final Map combox2Map = new HashMap();

        for (int i = 0; i < combox1List.size(); i++) {
            List l = new ArrayList();
            for (int j = 1; j < 10; j++) {
                int k = (int) combox1List.get(i) * 10 + j;
                l.add(k);
            }
            combox2Map.put(combox1List.get(i), l);
        }
        final Map combox3Map = new HashMap();
        for (Object o : combox1List) {
            for (Object o1 : (List) combox2Map.get(o)) {
                List l = new ArrayList();
                for (int i = 1; i < 10; i++) {
                    int value = (int) o1 * 10 + i;
                    l.add(value);
                }
                combox3Map.put(o1, l);
            }
        }
        ObservableList combox1 = FXCollections.observableList(combox1List);
        HBox box = new HBox(20);
        box.setPadding(new Insets(20, 20, 20, 20));
        ComboBox cb1 = new ComboBox();
        final ComboBox cb2 = new ComboBox();
        final ComboBox cb3 = new ComboBox();
        cb1.setItems(combox1);
        cb1.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue ov, Object t, Object t1) {
                ObservableList combox2 = FXCollections.observableArrayList((List) combox2Map.get(t1));
                cb2.setItems(combox2);
            }
        });

        cb2.getSelectionModel().selectedItemProperty().addListener(new ChangeListener() {
            @Override
            public void changed(ObservableValue ov, Object t, Object t1) {
                if (t1 != null) {
                    ObservableList combox3 = FXCollections.observableArrayList((List) combox3Map.get(t1));
                    cb3.setItems(combox3);
                }
            }
        });
        box.getChildren().addAll(cb1, cb2, cb3);
        Scene scene = new Scene(box, 300, 250);

        primaryStage.setTitle("Hello World!");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    /**
     * The main() method is ignored in correctly deployed JavaFX application.
     * main() serves only as fallback in case the application can not be
     * launched through deployment artifacts, e.g., in IDEs with limited FX
     * support. NetBeans ignores main().
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}

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