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Thread: JTextField getting text values

  1. #1
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    Default JTextField getting text values

    Hey guys, I'm trying to make a simple JFrame where the user will input information and the information will then be printed out. The problem is, I have no idea how to acquire the string which the user input. I've tried many different things and the main problem seems to be that I can't add an ActionListener to my JTextField for some reason...

    Here is the full code:

    package layout;
    import javax.swing.AbstractButton;
    import javax.swing.JButton;
    import javax.swing.JPanel;
    import javax.swing.JPasswordField;
    import javax.swing.SpringLayout;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JTextField;
    import java.awt.Container;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.KeyEvent;
     
    public class testing2 extends JPanel implements ActionListener {
    	JTextField textField = new JTextField("", 15);
    	protected static JButton b1;
    	protected JButton b2, b3;
     
        private static void createAndShowGUI() {
            //Create and set up the window.
            JFrame frame = new JFrame("SpringDemo2");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            //Set up the content pane.
            Container contentPane = frame.getContentPane();
            SpringLayout layout = new SpringLayout();
            contentPane.setLayout(layout);
     
            //Create and add the components.
            JLabel label = new JLabel("Username: ");
            JTextField textField = new JTextField("", 15);
            JLabel label2 = new JLabel("Password: ");
            JPasswordField textField2 = new JPasswordField("", 15);
            JLabel label3 = new JLabel("Re-enter Password: ");
            JPasswordField textField3 = new JPasswordField("", 15);
            JLabel label4 = new JLabel("Email Address: ");
            JTextField textField4 = new JTextField("", 15);
            b1 = new JButton("Finish");
            b1.setVerticalTextPosition(AbstractButton.CENTER);
            b1.setHorizontalTextPosition(AbstractButton.LEADING);
            b1.setMnemonic(KeyEvent.VK_F);
            b1.setActionCommand("Finish");
            contentPane.add(label);
            contentPane.add(textField);
            contentPane.add(label2);
            contentPane.add(textField2);
            contentPane.add(label3);
            contentPane.add(textField3);
            contentPane.add(label4);
            contentPane.add(textField4);
            contentPane.add(b1);
     
            //SET HEIGHT/WIDTH
            layout.putConstraint(SpringLayout.WEST, label,
                                 5,
                                 SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, label,
                                 5,
                                 SpringLayout.NORTH, contentPane);
     
     
            layout.putConstraint(SpringLayout.WEST, textField,
                                 56,
                                 SpringLayout.EAST, label);
            layout.putConstraint(SpringLayout.NORTH, textField,
                                 5,
                                 SpringLayout.NORTH, contentPane);
            //END SET HEIGHT/WIDTH
     
           //SET HEIGHT/WIDTH
     
            layout.putConstraint(SpringLayout.WEST, label2,
                                 5,
                                 SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, label2,
                                 33,
                                 SpringLayout.NORTH, contentPane);
     
     
     
            layout.putConstraint(SpringLayout.WEST, textField2,
                                 57,
                                 SpringLayout.EAST, label2);
            layout.putConstraint(SpringLayout.NORTH, textField2,
                                 33,
                                 SpringLayout.NORTH, contentPane);
     
            //END SET HEIGHT/WIDTH
     
          //SET HEIGHT/WIDTH
     
              layout.putConstraint(SpringLayout.WEST, label3,
                                   5,
                                   SpringLayout.WEST, contentPane);
              layout.putConstraint(SpringLayout.NORTH, label3,
                                   61,
                                   SpringLayout.NORTH, contentPane);
     
     
              layout.putConstraint(SpringLayout.WEST, textField3,
                                   5,
                                   SpringLayout.EAST, label3);
              layout.putConstraint(SpringLayout.NORTH, textField3,
                                   61,
                                   SpringLayout.NORTH, contentPane);
     
              //END SET HEIGHT/WIDTH
     
            //SET HEIGHT/WIDTH
     
                layout.putConstraint(SpringLayout.WEST, label4,
                                     5,
                                     SpringLayout.WEST, contentPane);
                layout.putConstraint(SpringLayout.NORTH, label4,
                                     89,
                                     SpringLayout.NORTH, contentPane);
     
     
     
                layout.putConstraint(SpringLayout.WEST, textField4,
                                     32,
                                     SpringLayout.EAST, label4);
                layout.putConstraint(SpringLayout.NORTH, textField4,
                                     89,
                                     SpringLayout.NORTH, contentPane);
     
                //END SET HEIGHT/WIDTH
     
              //SET HEIGHT/WIDTH
     
                  layout.putConstraint(SpringLayout.WEST, b1,
                                       125,
                                       SpringLayout.WEST, contentPane);
                  layout.putConstraint(SpringLayout.NORTH, b1,
                                       120,
                                       SpringLayout.NORTH, contentPane);
     
                  //END SET HEIGHT/WIDTH
     
            //Display the window.
            frame.pack();
            frame.setSize(325, 200);
            frame.setVisible(true);
        }
     
        [B]
        public void actionPerformed(ActionEvent e) {
        	if ("Finish".equals(e.getActionCommand())) {
        		String x = textField.getText();                       This piece of code here does nothing. :(
        		System.out.println(x);
        	}
    	}
        [/B]
     
        public static void main(String[] args) {
            //Schedule a job for the event-dispatching thread:
            //creating and showing this application's GUI.
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    createAndShowGUI();
                }
            });
        }
    }

    Any help would be greatly appreciated


  2. #2
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    Default Re: JTextField getting text values

    I don't see where any actionListeners are added to the components. In addition, if you wish to add an ActionListener to a JTextField and filter those events via the action command, you should set the ActionCommand of the JTextField.

  3. #3
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    Default Re: JTextField getting text values

    Well, that's just the problem, I can't add the actionlistener anywhere. For example, I try to add it here:

    private static void createAndShowGUI() {
            ...
            JTextField textField = new JTextField("", 15);
            [B]textField.addActionListener(this);[/B]

    And it comes up with the error "Cannot use this in a static context" I understand what the means but there's just no other way to do it.

  4. #4
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    Default Re: JTextField getting text values

    okay here's what i found in your code

     
    public class Test extends JPanel implements ActionListener {
    	 // I MADE IT STATIC SO THAT WE CAN USE IT ON createAndShowGUI
          static JTextField textField = new JTextField("", 15);
    	protected static JButton b1;
    	protected JButton b2, b3;
     
        private static void createAndShowGUI() {
            //Create and set up the window.
            JFrame frame = new JFrame("SpringDemo2");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            //Set up the content pane.
            Container contentPane = frame.getContentPane();
            SpringLayout layout = new SpringLayout();
            contentPane.setLayout(layout);
     
            //Create and add the components.
            JLabel label = new JLabel("Username: ");
     
            // THIS ONE IS THE PROBLEM, THIS OBJECT IS HIDING UR GLOBAL FIELD DELETE THIS LINE
            JTextField textField = new JTextField("", 15);
     
     
            JLabel label2 = new JLabel("Password: ");
            JPasswordField textField2 = new JPasswordField("", 15);
            JLabel label3 = new JLabel("Re-enter Password: ");



    As for your action listener: its better to do this

        public void actionPerformed(ActionEvent e) {
        	if (e.getSource()==b1) {
        		String x = textField.getText();
        		System.out.println(x);
        	}
    }

    so this code works for me:

    package util;
    import javax.swing.AbstractButton;
    import javax.swing.JButton;
    import javax.swing.JPanel;
    import javax.swing.JPasswordField;
    import javax.swing.SpringLayout;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JTextField;
    import java.awt.Container;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.KeyEvent;
     
    public class Test extends JPanel implements ActionListener {
    	static JTextField textField = new JTextField("", 15);
    	protected static JButton b1;
    	protected JButton b2, b3;
     
        private static void createAndShowGUI() {
            //Create and set up the window.
            JFrame frame = new JFrame("SpringDemo2");
            frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     
            //Set up the content pane.
            Container contentPane = frame.getContentPane();
            SpringLayout layout = new SpringLayout();
            contentPane.setLayout(layout);
     
            //Create and add the components.
            JLabel label = new JLabel("Username: ");
      //      JTextField textField = new JTextField("", 15);
            JLabel label2 = new JLabel("Password: ");
            JPasswordField textField2 = new JPasswordField("", 15);
            JLabel label3 = new JLabel("Re-enter Password: ");
            JPasswordField textField3 = new JPasswordField("", 15);
            JLabel label4 = new JLabel("Email Address: ");
            JTextField textField4 = new JTextField("", 15);
            b1 = new JButton("Finish");
            b1.setVerticalTextPosition(AbstractButton.CENTER);
            b1.setHorizontalTextPosition(AbstractButton.LEADING);
            b1.setMnemonic(KeyEvent.VK_F);
            b1.addActionListener(new Test());
            b1.setActionCommand("Finish");
            contentPane.add(label);
            contentPane.add(textField);
            contentPane.add(label2);
            contentPane.add(textField2);
            contentPane.add(label3);
            contentPane.add(textField3);
            contentPane.add(label4);
            contentPane.add(textField4);
            contentPane.add(b1);
     
            //SET HEIGHT/WIDTH
            layout.putConstraint(SpringLayout.WEST, label,
                                 5,
                                 SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, label,
                                 5,
                                 SpringLayout.NORTH, contentPane);
     
     
            layout.putConstraint(SpringLayout.WEST, textField,
                                 56,
                                 SpringLayout.EAST, label);
            layout.putConstraint(SpringLayout.NORTH, textField,
                                 5,
                                 SpringLayout.NORTH, contentPane);
            //END SET HEIGHT/WIDTH
     
           //SET HEIGHT/WIDTH
     
            layout.putConstraint(SpringLayout.WEST, label2,
                                 5,
                                 SpringLayout.WEST, contentPane);
            layout.putConstraint(SpringLayout.NORTH, label2,
                                 33,
                                 SpringLayout.NORTH, contentPane);
     
     
     
            layout.putConstraint(SpringLayout.WEST, textField2,
                                 57,
                                 SpringLayout.EAST, label2);
            layout.putConstraint(SpringLayout.NORTH, textField2,
                                 33,
                                 SpringLayout.NORTH, contentPane);
     
            //END SET HEIGHT/WIDTH
     
          //SET HEIGHT/WIDTH
     
              layout.putConstraint(SpringLayout.WEST, label3,
                                   5,
                                   SpringLayout.WEST, contentPane);
              layout.putConstraint(SpringLayout.NORTH, label3,
                                   61,
                                   SpringLayout.NORTH, contentPane);
     
     
              layout.putConstraint(SpringLayout.WEST, textField3,
                                   5,
                                   SpringLayout.EAST, label3);
              layout.putConstraint(SpringLayout.NORTH, textField3,
                                   61,
                                   SpringLayout.NORTH, contentPane);
     
              //END SET HEIGHT/WIDTH
     
            //SET HEIGHT/WIDTH
     
                layout.putConstraint(SpringLayout.WEST, label4,
                                     5,
                                     SpringLayout.WEST, contentPane);
                layout.putConstraint(SpringLayout.NORTH, label4,
                                     89,
                                     SpringLayout.NORTH, contentPane);
     
     
     
                layout.putConstraint(SpringLayout.WEST, textField4,
                                     32,
                                     SpringLayout.EAST, label4);
                layout.putConstraint(SpringLayout.NORTH, textField4,
                                     89,
                                     SpringLayout.NORTH, contentPane);
     
                //END SET HEIGHT/WIDTH
     
              //SET HEIGHT/WIDTH
     
                  layout.putConstraint(SpringLayout.WEST, b1,
                                       125,
                                       SpringLayout.WEST, contentPane);
                  layout.putConstraint(SpringLayout.NORTH, b1,
                                       120,
                                       SpringLayout.NORTH, contentPane);
     
                  //END SET HEIGHT/WIDTH
     
            //Display the window.
            frame.pack();
            frame.setSize(325, 200);
            frame.setVisible(true);
        }
     
        //HERE
        public void actionPerformed(ActionEvent e) {
        	if (e.getSource()==b1) {
        		String x = textField.getText();
        		System.out.println(x);
        	}
    	}
     
     
        public static void main(String[] args) {
            //Schedule a job for the event-dispatching thread:
            //creating and showing this application's GUI.
            javax.swing.SwingUtilities.invokeLater(new Runnable() {
                public void run() {
                    createAndShowGUI();
                }
            });
        }
    }

    PS: JUST RENAME THE PACKAGE AND CLASS NAME,

  5. #5
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    Default Re: JTextField getting text values

    Quote Originally Posted by The_Mexican View Post
    And it comes up with the error "Cannot use this in a static context" I understand what the means but there's just no other way to do it.
    That information would have been helpful in your original post. this in a static function is out of context because there is not this. Create an instance of the class, then add that as the action listener.
    testing2 t2 = new testing2();
    textField.addActionListener(t2);

  6. #6
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    Default Re: JTextField getting text values

    Thanks relixus.

    Copeg, why is there no this in a static function? I dont get it, sorry I'm a beginner xD.

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    Default Re: JTextField getting text values

    You need to have that class that you have the text field in having the method

    actionPerformed(ActionEvent e)

    if you use this

  8. #8
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    Default Re: JTextField getting text values

    Quote Originally Posted by The_Mexican View Post
    Thanks relixus.

    Copeg, why is there no this in a static function? I dont get it, sorry I'm a beginner xD.
    Because this refers to a specific instance of an object.

    Static methods don't have a this because they are defined on the class level, and there is no instance to refer to.

    Read this for more info: Understanding Instance and Class Members (The Java™ Tutorials > Learning the Java Language > Classes and Objects)

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    Default Re: JTextField getting text values

    You mean you call them like this:

    ClassName.method();

    ?

    Thought so.

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