Text Listener

Question

I'm having trouble finding a tutorial on adding a text listener. What I what to do is have the user input a file name and then the program can get data from that file. Is there a standard way of knowing when the user is done inputting, besides adding a button that says "Done"?
Thanks

Answer 1

The only way your program can know the user is done entering a value is if the user tells it so. In addition to a "Done" button, you can add an ActionListener to the JTextField itself:   field.addActionListener(new ActionListener() {
    public void actionPerformed(ActionEvent evt) {
      // same as for "Done" button
  }); This action will be performed when the user presses Enter. A neater approach is to create an Action object that you attach to both the textfield and the button.
in the keyReleased event of text field.No. Never use KeyListeners on JTextFields. If you need to listen for changes in a text component, use a DocumentListener:   textField.getDocument().addDocumentListener(new DocumentListener() {
    public void insertUpdate(DocumentEvent evt) {
      doSomething();
    public void removeUpdate(DocumentEvent evt) {
      doSomething();
    public void changedUpdate(DocumentEvent evt) {
      // ignore this one
  }