[英]Use one JComboBox to control another Jcombo Box
I want the value of one JComboBox
to change depending upon the value of another JComboBox
. 我希望一个
JComboBox
的值根据另一个JComboBox
的值进行更改。 in one JComboBox
, I am showing designation of doctors, which I retrieve from the database. 在一个
JComboBox
,我正在显示从数据库中检索到的医生的JComboBox
。 Depending on that designation I want to show the name of doctors in another JComboBox
. 根据该名称,我想在另一个
JComboBox
显示医生的姓名。 all the information is stored in doctor table. 所有信息都存储在医生表中。
您需要为一个jcombobox1构建侦听器,然后在此处处理jcombobox2。
Add an ActionListener
to the first combo box. 将
ActionListener
添加到第一个组合框。 In the listener you need to reset the ComboBoxModel
of the second combo box based on the selected item. 在侦听器中,您需要根据所选项目重置第二个组合框的
ComboBoxModel
。
Something like: 就像是:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.basic.*;
public class ComboBoxTwo extends JPanel implements ActionListener
{
private JComboBox<String> mainComboBox;
private JComboBox<String> subComboBox;
private Hashtable<String, String[]> subItems = new Hashtable<String, String[]>();
public ComboBoxTwo()
{
String[] items = { "Select Item", "Color", "Shape", "Fruit" };
mainComboBox = new JComboBox<String>( items );
mainComboBox.addActionListener( this );
// prevent action events from being fired when the up/down arrow keys are used
mainComboBox.putClientProperty("JComboBox.isTableCellEditor", Boolean.TRUE);
add( mainComboBox );
// Create sub combo box with multiple models
subComboBox = new JComboBox<String>();
subComboBox.setPrototypeDisplayValue("XXXXXXXXXX"); // JDK1.4
add( subComboBox );
JButton arrow = SwingUtils.getDescendantOfType(JButton.class, subComboBox, "Text", "");
Dimension d = arrow.getPreferredSize();
System.out.println(arrow.getClass());
System.out.println(d);
d.width = 100;
arrow.setPreferredSize(d);
String[] subItems1 = { "Select Color", "Red", "Blue", "Green" };
subItems.put(items[1], subItems1);
String[] subItems2 = { "Select Shape", "Circle", "Square", "Triangle" };
subItems.put(items[2], subItems2);
String[] subItems3 = { "Select Fruit", "Apple", "Orange", "Banana" };
subItems.put(items[3], subItems3);
}
public void actionPerformed(ActionEvent e)
{
String item = (String)mainComboBox.getSelectedItem();
Object o = subItems.get( item );
if (o == null)
{
subComboBox.setModel( new DefaultComboBoxModel() );
}
else
{
subComboBox.setModel( new DefaultComboBoxModel( (String[])o ) );
}
}
private static void createAndShowUI()
{
try
{
// UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (Exception e) { }
JFrame frame = new JFrame("SSCCE");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add( new ComboBoxTwo() );
frame.setLocationByPlatform( true );
frame.pack();
frame.setVisible( true );
}
public static void main(String[] args)
{
EventQueue.invokeLater(new Runnable()
{
public void run()
{
createAndShowUI();
}
});
}
}
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