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How can we show a popup menu when the user right-clicks on a JComboBox in Java?
A JComboBox is a subclass of JComponent class that displays a drop-down list and gives users options that we can select one and only one item at a time. A JComboBox can be editable or read-only. A getSelectedItem() method can be used to get the selected or entered item from a combo box. We can invoke a popup menu from a JComboxBox when the user right-clicks on it by implementing a MouseListener interface and need to override the mouseReleased() method. The method isPopupTrigger() of MouseEvent class can be used to show a popup menu.
Example
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class JComboBoxPopupTest extends JFrame {
private JComboBox jcb;
private JPopupMenu jpm;
private JMenuItem mItem1, mItem2;
public JComboBoxPopupTest() {
setTitle("JComboBoxPopup Test");
setLayout(new FlowLayout());
jcb = new JComboBox(new String[] {"Item 1", "Item 2", "Item 3"});
jpm = new JPopupMenu();
mItem1 = new JMenuItem("Popup Item 1");
mItem2 = new JMenuItem("Popup Item 2");
jpm.add(mItem1);
jpm.add(mItem2);
((JButton)jcb.getComponent(0)).addMouseListener(new MouseAdapter() {
public void mouseReleased(MouseEvent me) {
if (me.isPopupTrigger()) {
jpm.show(jcb, me.getX(), me.getY());
}
}
});
add(jcb);
setSize(400, 300);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
setVisible(true);
}
public static void main(String[] args) throws Exception {
new JComboBoxPopupTest();
}
}Output
Updated on: 10-Feb-2020
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