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Madhur Ahuja · Guest

Hello

Does JTextField invokes the listener, when the user changes the text in it.
I am trying to disable a button, based on the content in the JTextField, but
the listener method is not being invoked at all.

Compilable code:

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

class mainapp implements ActionListener
{

JPanel mainpanel;
JTextField from,to,server; file://these are the text fields which are to
be monitored
// JFormattedTextField from,to,server;
JTextArea body,result;
JFrame mainframe;
GridBagLayout gbc;
GridBagConstraints constraints;
JButton send;
JLabel lfrom,lto,lserver,lbody,lresult;
public mainapp()
{
gbc=new GridBagLayout();
mainpanel=new JPanel(gbc);
constraints = new GridBagConstraints();

mainframe =new JFrame("Mail send");

addwidgets();

mainframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// mainframe.setSize(new Dimension(120, 40));
mainframe.getContentPane().add(mainpanel);
mainpanel.setSize(400,400);

mainframe.pack();
mainframe.validate();
mainframe.setVisible(true);
}

void addwidgets()
{
from=new JTextField(10);
// from=new JFormattedTextField();
from.setColumns(10);

body=new JTextArea(10,30);

to=new JTextField(10);
file://to=new JFormattedTextField();
to.setColumns(10);
server=new JTextField(10);
file://server=new JFormattedTextField();
server.setColumns(10);

send=new JButton("Send");
send.setEnabled(false);
result=new JTextArea(4,30);

lfrom=new JLabel("From:");
lbody=new JLabel("Body:");
lto=new JLabel("To:");
lserver=new JLabel("Server:");

lresult=new JLabel("Result:");

from.addActionListener(this);
// from.addPropertyChangeListener("text",this);

file://body.addActionListener(this);
to.addActionListener(this);
server.addActionListener(this);
send.addActionListener(this);
file://result.addActionListener(this);

buildConstraints(constraints,0,0,1,1,80,10);
gbc.setConstraints(lfrom, constraints);
mainpanel.add(lfrom);

buildConstraints(constraints,1,0,1,1,20,10);
gbc.setConstraints(from, constraints);
mainpanel.add(from);

buildConstraints(constraints,0,3,1,1,0,10);
gbc.setConstraints(lbody, constraints);
mainpanel.add(lbody);

buildConstraints(constraints,1,3,1,1,0,10);
gbc.setConstraints(body, constraints);
mainpanel.add(body);

buildConstraints(constraints,0,1,1,1,0,10);
gbc.setConstraints(lto, constraints);
mainpanel.add(lto);

buildConstraints(constraints,1,1,1,1,0,10);
gbc.setConstraints(to, constraints);
mainpanel.add(to);

buildConstraints(constraints,0,2,1,1,0,10);
gbc.setConstraints(lserver, constraints);
mainpanel.add(lserver);

buildConstraints(constraints,1,2,1,1,0,10);
gbc.setConstraints(server, constraints);
mainpanel.add(server);

buildConstraints(constraints,1,4,1,1,0,0);
gbc.setConstraints(send, constraints);
mainpanel.add(send);

buildConstraints(constraints,0,5,1,1,0,10);
gbc.setConstraints(lresult, constraints);
mainpanel.add(lresult);

buildConstraints(constraints,1,5,1,1,0,10);
gbc.setConstraints(result, constraints);
mainpanel.add(result);

}

public static void main(String args[])
{
new mainapp();

}
public void propertyChange(PropertyChangeEvent evt)
{
Object src=evt.getSource();
if(src==from)
{
System.out.println("dffd");
}
}

public void actionPerformed(ActionEvent e)
{
if(e.getSource().getClass()==JTextField.class)
{
System.out.println("dfd");
JTextField obj=(JTextField)e.getSource();
if(obj.getText()=="")
{
send.setEnabled(false);
}
else
send.setEnabled(true);
}

else if(e.getSource().getClass()==Button.class)
{
if(e.getSource()==send)
{

System.out.println("dffd");
}
}

}

void buildConstraints(GridBagConstraints gbc, int gx, int gy,
int gw, int gh, int wx, int wy) {
gbc.gridx = gx;
gbc.gridy = gy;
gbc.gridwidth = gw;
gbc.gridheight = gh;
gbc.weightx = wx;
gbc.weighty = wy;
}

}

--
Winners dont do different things, they do things differently.

Madhur Ahuja
India

Homepage : http://madhur.netfirms.com
Email : madhur<underscore>ahuja<at>yahoo<dot>com

Luc Van Bogaert · Guest

On Mon, 23 Aug 2004 19:21:13 UTC, "Madhur Ahuja" <ef (AT) df (DOT) com> wrote:

Andrew Thompson · Guest

On Tue, 24 Aug 2004 00:51:13 +0530, Madhur Ahuja wrote: