Re: How do I get a selected value from JDialog?
mwmann wrote:
Hi everyone
I have a class which extends JDialog, its purpose is to show a list of
values retrieved from a database, which will allow the user to select
from a table in this Dialoge, the selected string value in the dialog
should be accessable from the Parent form when the dialog is closed/OK
pressed- or a text field in the parent field populated when OKAY
clicked.
How do go about retrieving the user selected value from the dialog ?
Code samples/ psuedo code would be helpfull.
Thanks
Here is a simple working example for you. There are literally hundreds
of ways to do this task but these are the critical elements.
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class test4 {
static JTextField tf;
static JButton b;
public static void main(String[] args) {
class DataDialog extends JDialog {
public String result;
public DataDialog(Frame parent, boolean modal, String[] data) {
super(parent,modal);
final JComboBox bx = new JComboBox(data);
add(bx,BorderLayout.WEST);
final JButton b = new JButton("OKAY");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
result = (String)bx.getSelectedItem();
setVisible(false);
dispose();
}
});
add(b,BorderLayout.EAST);
pack();
setLocationRelativeTo(parent);
}
}
Runnable r = new Runnable() {
public void run() {
final JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// text field to hold result
tf = new JTextField();
f.add(tf,BorderLayout.NORTH);
b = new JButton("Get Data From DB");
b.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ae) {
// disable button so you can't try to retrieve
while
// the previous request is going on
b.setEnabled(false);
// it could take a while so retrieve the data in
// another thread
Runnable r = new Runnable() {
public void run() {
// simulate retrieving data from db
try { Thread.sleep(1000); }
catch (InterruptedException ie) { }
// this is simulated data
String[] s = {"one","two","three","four"};
// create dialog
DataDialog d = new DataDialog(f,true,s);
d.setVisible(true);
// get data from public variable in
DataDialog
// and show data in text field in frame
tf.setText(d.result);
// re-enable button
b.setEnabled(true);
}
};
new Thread(r).start();
}
});
f.add(b,BorderLayout.SOUTH);
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
};
EventQueue.invokeLater(r);
}
}
--
Knute Johnson
email s/nospam/knute/