How to use addItem() on a JComboBox without modifying the editor?

Question

I'm trying to use an editable JComboBox such that upon a user typing into the editor, possible results are displayed in the list part of the combo box.

Unfortunately, I've found that upon using either addItem(item) or getModel().addItem(item), the input typed by the user is overwritten by the first value I added. I've considered storing the editor value, adding items, and then using setSelectedItem() to fix this, but I wan't to preserve the state of any selected text/ caret position, and believe this should be something more trivial, but can't for the life of me figure it out.

JComboBox box = new JComboBox();
box.setModel(new MutableComboBoxModel());
box.setEditable(true);
box.getEditor().getEditorComponent().addKeyListener(new KeyListener() {
  public void keyPressed(KeyEvent e) {

  }

  public void keyReleased(KeyEvent e) {
  }

  public void keyTyped(KeyEvent e) {
    // Actual results are retrieved from server via HTTP
    box.addItem("Demo");
    // Here, the editor window the user was typing in is replaced with the value "Demo".. how to fix this?
  }
});

score 1 · Accepted Answer · edited May 23 '17 at 12:12

1

use AutoComplete JComboBox / JTextField,
for listening in JTextComponent is there DocumentListener,
never use KeyListener for Swing JComponents, this listener is designated for AWT Components, for Swing JComponents is there KeyBindings

edited May 23 '17 at 12:12

Community

1
1

answered Mar 06 '12 at 16:41

mKorbel

109,525
20
134
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score 0 · Answer 2 · answered Mar 07 '12 at 11:20

0

You need to implement your own MutableComboBoxModel since DefaultComboBoxModel is responsible for the "add item then auto select it" behavior.

answered Mar 07 '12 at 11:20

Walter Laan

2,956
17
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How to use addItem() on a JComboBox without modifying the editor?

2 Answers2