Based on JTextField content, enable or disable a JButton : TextField « Swing JFC « Java

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Java » Swing JFC » TextField

Screenshots

Based on JTextField content, enable or disable a JButton


    



import javax.swing.JButton;

import javax.swing.JTextField;

import javax.swing.event.DocumentEvent;

import javax.swing.event.DocumentListener;

import javax.swing.text.Document;



public class Main {

  JButton button = new JButton("foo");

  JTextField textfield = new JTextField(10);

  Document document;



  public Main() {

    document = textfield.getDocument();

    document.addDocumentListener(new JButtonStateController());

  }

  class JButtonStateController implements DocumentListener {

    JButtonStateController() {

    }



    public void changedUpdate(DocumentEvent e) {

      disableIfEmpty(e);

    }



    public void insertUpdate(DocumentEvent e) {

      disableIfEmpty(e);

    }



    public void removeUpdate(DocumentEvent e) {

      disableIfEmpty(e);

    }



    public void disableIfEmpty(DocumentEvent e) {

      button.setEnabled(e.getDocument().getLength() > 0);

    }

  }

}

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