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Thread: Need help int JTextField

  1. #1
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    Default Need help in JTextField

    ok i just created a text box with JTextField
    here is the code:-
    public class TextField1 extends JApplet implements ActionListener 
       {
        JTextField Input;
        JTextField Echo;
     
        LayoutManager Layout;
        public TextField1 () {
        Panel.setSize(700,400);
     
        Echo = new JTextField ("", 20);
        Input = new JTextField ("", 20);
        Layout = new FlowLayout ();
     
        Echo.setEditable (false);
        Input.setBackground (Color.white);
        Input.addActionListener (this);
        Panel.setLayout (Layout);
        Panel.add (Echo);
        Panel.add (Input);
     
        Panel.setVisible(true);
        }
        public void actionPerformed (ActionEvent e) {
         Echo.setText (Input.getText());
         Input.setText("");
        }
       }

    this is sub-class of the main class and Panel is JFrame
    i need help in changing the length of Echo(not the bredth).
    Plz Help
    Regards.
    Last edited by n00b; November 1st, 2011 at 09:22 AM.


  2. #2
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    Default Re: Need help int JTextField

    what do you mean by length?
    Altho just an estimated guess at what your trying to do..

    Try using BorderLayout:

    Panel.setLayout(new BorderLayout());
    Panel.add(Echo, BorderLayout.WEST);

    otherwise try to create a new panel.

    add the panel to the JFrame and the textbox to the panel:

    pan = new JPanel();
    pan.add(Echo);
     
    Panel.add(pan);

  3. #3
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    Default Re: Need help int JTextField

    i meant to say to change the length of the text box created with JTextField (Echo)

    Echo = new JTextField ("", 20);

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    Default Re: Need help int JTextField

    simply change the 20 to longer or shorter depending on the size you want it..

    Echo = new JTextField(10);

    Also dont bother putting "", before the int if you do not want to have default text displayed in your textbox.
    as later on you could always use

    Echo.setText("text wanted...");

    If my understanding is wrong please let me know, I'm half asleep whilst doing multiple things. Sorry.

  5. #5
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    Default Re: Need help int JTextField

    i m not that n00b lolz
    but when i increase the value,the width of the textbox increases but length remains the same

  6. #6
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    Default Re: Need help int JTextField

    oh sorry.. do you mean you would like to only allow a certain amount of characters to be entered into the textbox ?

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    Default Re: Need help int JTextField

    woot if i finaly understood you ^.^ think i need to have abit of a sleep now lol.


    Limiting the amount of characters that can be put in a textfield before you cannot type anymore:
    import java.awt.FlowLayout;
     
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JTextField;
    import javax.swing.text.AttributeSet;
    import javax.swing.text.BadLocationException;
    import javax.swing.text.PlainDocument;
     
    class JTextFieldLimit extends PlainDocument {
      private int limit;
      JTextFieldLimit(int limit) {
        super();
        this.limit = limit;
      }
     
      JTextFieldLimit(int limit, boolean upper) {
        super();
        this.limit = limit;
      }
     
      public void insertString(int offset, String str, AttributeSet attr) throws BadLocationException {
        if (str == null)
          return;
     
        if ((getLength() + str.length()) <= limit) {
          super.insertString(offset, str, attr);
        }
      }
    }
     
    public class Main extends JFrame {
      JTextField textfield1;
     
      JLabel label1;
     
      public void init() {
        setLayout(new FlowLayout());
        label1 = new JLabel("max 10 chars");
        textfield1 = new JTextField(15);
        add(label1);
        add(textfield1);
        textfield1.setDocument(new JTextFieldLimit(10));
     
        setSize(300,300);
        setVisible(true);
      }
    }

    Congratulations you now know everything about a JTextField lol..
    Last edited by macko; November 1st, 2011 at 09:48 AM.

  8. The Following User Says Thank You to macko For This Useful Post:

    n00b (November 1st, 2011)

  9. #8
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    Default Re: Need help int JTextField

    lol...Yea you finally understood me
    but it was not exactly what i wanted but i got some help and got the solution thanks

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