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Thread: Add extended JPanel on selected index change of JComboBox

  1. #1
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    Default 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!


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Add extended JPanel on selected index change of JComboBox

    That's a bit too much code to wade through, but you can't just add components to an already visible container. You have to revalidate afterwards. Google and the API are your friend there. You might also look into using a CardLayout.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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  3. #3
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    Default Re: Add extended JPanel on selected index change of JComboBox

    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.

  4. #4
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Add extended JPanel on selected index change of JComboBox

    That definitely sounds like a job for a CardLayout then.
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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