Thread: Add extended JPanel on selected index change of JComboBox

I am trying to add a JPanel to a JFrame when the type is selected from a JComboBox. It does something funny....it looks like nothing happens but as you click on where the panel should have been added, items start showing up, but not the label. However. I want the JPanel to popup in the frame when the correct type is selected from the dropdown.

here is the code fro my main application and the JPanel class:

import java.awt.Color;
import java.awt.EventQueue;
 
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JTextArea;
import javax.swing.JButton;
import javax.swing.JInternalFrame;
import javax.swing.JPanel;
import com.jgoodies.forms.factories.DefaultComponentFactory;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
 
 
public class MainApp {
 
	private JFrame frmIntegrationServiceApi;
	private JTextField textField;
 
	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				try {
					MainApp window = new MainApp();
					window.frmIntegrationServiceApi.setVisible(true);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		});
	}
 
	/**
	 * Create the application.
	 */
	public MainApp() {
		initialize();
	}
 
	/**
	 * Initialize the contents of the frame.
	 */
 
 
 
	private void initialize() {
		frmIntegrationServiceApi = new JFrame();
		frmIntegrationServiceApi.setTitle("Integration Services API Test");
		frmIntegrationServiceApi.setBounds(100, 100, 900, 590);
		frmIntegrationServiceApi.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frmIntegrationServiceApi.getContentPane().setLayout(null);
 
		JLabel lblNewLabel = new JLabel("IS Host");
		lblNewLabel.setBounds(20, 11, 42, 14);
		frmIntegrationServiceApi.getContentPane().add(lblNewLabel);
 
		textField = new JTextField();
		textField.setBounds(82, 8, 238, 20);
		frmIntegrationServiceApi.getContentPane().add(textField);
		textField.setColumns(10);
 
		JLabel lblInterface = new JLabel("Interface");
		lblInterface.setBounds(20, 42, 56, 14);
		frmIntegrationServiceApi.getContentPane().add(lblInterface);
 
 
 
		final JComboBox comboBox = new JComboBox();
		comboBox.setModel(new DefaultComboBoxModel(new String[] {"Select Interface", "IAgentManagment", "IContactManagement", "ISessionManagment"}));
		comboBox.setBounds(82, 39, 238, 20);
		frmIntegrationServiceApi.getContentPane().add(comboBox);
 
 
		class MyItemListener implements ItemListener
		{
 
			@Override
			public void itemStateChanged(ItemEvent arg0) {
				if(comboBox.getSelectedIndex() == 1)
				{
					IAgent ia = new IAgent();
					ia.setBounds(20, 70, 300, 425);
					frmIntegrationServiceApi.getContentPane().add(ia);
				}
 
			}
 
		}
		MyItemListener actionListener = new MyItemListener();
		comboBox.addItemListener(actionListener);
 
 
		JLabel lblGeneratedUrl = new JLabel("Generated URL to Post to Integration Services");
		lblGeneratedUrl.setBounds(389, 11, 288, 14);
		frmIntegrationServiceApi.getContentPane().add(lblGeneratedUrl);
 
		JTextArea textArea = new JTextArea();
		textArea.setBounds(389, 25, 485, 46);
		frmIntegrationServiceApi.getContentPane().add(textArea);
 
		JLabel lblNewLabel_1 = new JLabel("Response from API in HTML");
		lblNewLabel_1.setBounds(389, 82, 138, 14);
		frmIntegrationServiceApi.getContentPane().add(lblNewLabel_1);
 
		JTextArea textArea_1 = new JTextArea();
		textArea_1.setBounds(389, 103, 485, 257);
		frmIntegrationServiceApi.getContentPane().add(textArea_1);
 
		JLabel lblNewLabel_2 = new JLabel("Response from API in Text");
		lblNewLabel_2.setBounds(389, 371, 138, 14);
		frmIntegrationServiceApi.getContentPane().add(lblNewLabel_2);
 
		JTextArea textArea_2 = new JTextArea();
		textArea_2.setBounds(389, 393, 485, 148);
		frmIntegrationServiceApi.getContentPane().add(textArea_2);
 
		JButton btnCreateUrl = new JButton("Create URL");
		btnCreateUrl.setBounds(20, 518, 112, 23);
		frmIntegrationServiceApi.getContentPane().add(btnCreateUrl);
 
		JButton btnPost = new JButton("Post");
		btnPost.setBounds(142, 518, 89, 23);
		frmIntegrationServiceApi.getContentPane().add(btnPost);
 
		final JPanel panel = new JPanel();
		panel.setBounds(20, 67, 300, 425);
		frmIntegrationServiceApi.getContentPane().add(panel);
 
 
	}
}

import java.awt.Color;
 
import javax.swing.BorderFactory;
import javax.swing.JPanel;
import javax.swing.JLabel;
import javax.swing.JComboBox;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JTextField;
 
 
public class IAgent extends JPanel {
	private JTextField textField;
	private JTextField textField_1;
	private JTextField textField_2;
	private JTextField textField_3;
	private JTextField textField_4;
 
	/**
	 * Create the panel.
	 */
	public IAgent() {
		setLayout(null);
 
		setBorder(BorderFactory.createLineBorder(Color.black, 1));
 
		JLabel lblIagentmanagement = new JLabel("IAgentManagement");
		lblIagentmanagement.setBounds(10, 11, 124, 14);
		add(lblIagentmanagement);
 
		JLabel lblNewLabel = new JLabel("Agent Event");
		lblNewLabel.setBounds(10, 36, 65, 14);
		add(lblNewLabel);
 
		JComboBox comboBox = new JComboBox();
		comboBox.setModel(new DefaultComboBoxModel(new String[] {"", "Agent Logon", "Agent LogOff"}));
		comboBox.setBounds(85, 33, 205, 20);
		add(comboBox);
 
		JLabel lblAgent = new JLabel("Agent");
		lblAgent.setBounds(10, 87, 36, 14);
		add(lblAgent);
 
		textField = new JTextField();
		textField.setBounds(85, 84, 205, 20);
		add(textField);
		textField.setColumns(10);
 
		JLabel lblAgentDs = new JLabel("Agent DS");
		lblAgentDs.setBounds(10, 132, 46, 14);
		add(lblAgentDs);
 
		textField_1 = new JTextField();
		textField_1.setBounds(85, 129, 205, 20);
		add(textField_1);
		textField_1.setColumns(10);
 
		JLabel lblDevice = new JLabel("Device");
		lblDevice.setBounds(10, 178, 46, 14);
		add(lblDevice);
 
		textField_2 = new JTextField();
		textField_2.setBounds(85, 175, 205, 20);
		add(textField_2);
		textField_2.setColumns(10);
 
		JLabel lblDeviceDs = new JLabel("Device DS");
		lblDeviceDs.setBounds(10, 229, 65, 14);
		add(lblDeviceDs);
 
		textField_3 = new JTextField();
		textField_3.setBounds(85, 226, 205, 20);
		add(textField_3);
		textField_3.setColumns(10);
 
		JLabel lblAgentSkill = new JLabel("Agent Skill");
		lblAgentSkill.setBounds(10, 283, 65, 14);
		add(lblAgentSkill);
 
		textField_4 = new JTextField();
		textField_4.setBounds(85, 280, 205, 20);
		add(textField_4);
		textField_4.setColumns(10);
 
	}
 
}

Thanks in Advance!

hey, you helped me more than you know! what you said about not being able to add components got me thinking. I figured it out I add the elements in an absolute layout and set the same bounds, then just toggled their visibility based on the selected index change. I feel a little silly that I couldn't arrive at that conclusion on my own, but I appreciate your reponse because it lead me to the solution.

                 /////////////////////////////////////////////////////////////////////////////////////////////
		//event listener for Selected Item index change to detect which extended JPanel is visible//
		////////////////////////////////////////////////////////////////////////////////////////////
		class MyItemListener implements ItemListener
		{
 
			@Override
			public void itemStateChanged(ItemEvent arg0) {
				if(comboBox.getSelectedIndex() == 1)
				{
					ia.setVisible(true);
					ic.setVisible(false);
					is.setVisible(false);
					IAShown = true;
					ICShown = false;
					ISShown = false;
 
				}
				else if(comboBox.getSelectedIndex() == 2)
				{
					ia.setVisible(false);
					ic.setVisible(true);
					is.setVisible(false);
					IAShown = false;
					ICShown = true;
					ISShown = false;
				}
				else if(comboBox.getSelectedIndex() == 3)
				{
					ia.setVisible(false);
					ic.setVisible(false);
					is.setVisible(true);
					IAShown = false;
					ICShown = false;
					ISShown = true;
				}
				else
				{
					ia.setVisible(false);
					ic.setVisible(false);
					is.setVisible(false);
					IAShown = false;
					ICShown = false;
					ISShown = false;
				}
 
			}
 
		}//end of action listener

ia, ic, and is are composite JPanels with different form structures.