Re: Problem handling events on a JCombobox

Luc Van Bogaert wrote: 
Hi,

I'm using an editable JComboBox to start a search on a database table. In some cases, the combobox generates two action events (after Enter, and after a selection change) How can I avoid to process the same actionevent code (my search routine) twice?

Thanks!


Luc:

The JComboBox produces ActionEvents on two different actions. One is caused by selecting a new item the other by editing the field. Run my little program below and you will see. If you call setActionCommand("something") on the box that only effects the ActionEvent that is fired when a different item is selected not when you edit and/or press Enter in the editable part of the field. So if you don't want the event that is caused by pressing Enter throw away the event with the action command "comboBoxEdited".

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class test3 {
    public static void main(String[] args) {
        String[] items = {"item1","item2","item3"};
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JComboBox b = new JComboBox(items);
        b.setEditable(true);
        b.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent ae) {
                String ac = ae.getActionCommand();
                System.out.println(ac);
            }
        });
        f.add(b);
        f.pack();
        f.setVisible(true);
    }
}


--

Knute Johnson
email s/nospam/knute/
.

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