Autocomplete Jcombobox

Question

I have a JComboBox that the autocomplete is only searching for the beginning of the word and need that when the user type search for any occurrence within the word, which is the way that the autocomplete of the jQuery works. Ex:

List of Cities:

• Goiânia
• São Paulo
• Belo Horizonte
• Rio de Janeiro

If the user type 'neiro' I need to appear already Rio de Janeiro. Currently if the user type the word does not appear anything, because it looks only at the beginning of the name. I’ve tried it in many ways and it didn’t work, I looked it up on the Internet and nothing worked that way.

Answer 1

Two other developers here managed to solve the problem. They fixed the custom code that made the searches.

class Principal {
private static void createAndShowGUI() {
    // the combo box (add/modify items if you like to)
    JComboBox comboBox = new JComboBox(new Object[] {"Ester", "Jordi", "Jordina", "Jorge", "Sergi", "1040506070", "SISTEMAS DA INFORMAÇÃO", "SAL", "GOIANIA", "COORDENACAO DE RH"});
    // has to be editable
    comboBox.setEditable(true);
    // get the combo boxes editor component
    JTextComponent editor = (JTextComponent) comboBox.getEditor().getEditorComponent();
    // change the editor's document
    editor.setDocument(new SearchableComboBox(comboBox));
    comboBox.setSelectedIndex(-1);

    // create and show a window containing the combo box
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(3);
    frame.getContentPane().add(comboBox);
    frame.pack(); frame.setVisible(true);
}


public static void main(String[] args) {
    javax.swing.SwingUtilities.invokeLater(new Runnable() {
        public void run() {
            createAndShowGUI();
        }
    });}

and

class SearchableComboBox extends PlainDocument {

private static final long serialVersionUID = 4956303094169423395L;

JComboBox comboBox;
ComboBoxModel model;
JTextComponent editor;
// flag to indicate if setSelectedItem has been called
// subsequent calls to remove/insertString should be ignored
boolean selecting=false;
StringBuilder caracteresParaBusca = new StringBuilder();
int teclaAtual = 0;

public SearchableComboBox(final JComboBox comboBox) {
    this.comboBox = comboBox;
    model = comboBox.getModel();
    editor = (JTextComponent) comboBox.getEditor().getEditorComponent();

    comboBox.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            if (!selecting) highlightCompletedText(0);
        }
    });
    editor.addKeyListener(new KeyAdapter() {
        public void keyPressed(KeyEvent e) {    
            teclaAtual = e.getKeyCode();        
            String digitado = e.getKeyChar() + "";              
            if(digitado.matches("[A-Za-z0-9 -.,/]")){
                caracteresParaBusca.append(e.getKeyChar());  
            }

            if(e.getKeyCode() == KeyEvent.VK_ENTER) {
                try {
                    insertString(0,caracteresParaBusca.toString(), null);
                } catch (BadLocationException e1) {
                    e1.printStackTrace();
                } 
            }

            if (comboBox.isDisplayable()) comboBox.setPopupVisible(true);
        }
    });
}

public void remove(int offs, int len) throws BadLocationException {
    if (selecting) return;
    super.remove(offs, len);
}

public void insertString(int offs, String str, AttributeSet a) throws BadLocationException {
    if (selecting) return;
    super.insertString(offs, str, a);
    Object item = null;

    if(teclaAtual == KeyEvent.VK_ENTER){
        item = lookupItem(caracteresParaBusca.toString());
        caracteresParaBusca.delete(0, caracteresParaBusca.length());
    } else {
        return;
    }

    if (item != null) {
        setSelectedItem(item);
   } else {
        item = comboBox.getSelectedItem();
        offs = offs-str.length();
        comboBox.getToolkit().beep(); // when available use: UIManager.getLookAndFeel().provideErrorFeedback(comboBox);

    }
    setText(item.toString());
    //highlightCompletedText(offs+str.length());
}

private void setText(String text) throws BadLocationException {
    super.remove(0, getLength());
    super.insertString(0, text, null);
}

private void highlightCompletedText(int start) {
    editor.setSelectionStart(start);
    editor.setSelectionEnd(getLength());
}

private void setSelectedItem(Object item) {
    selecting = true;
    model.setSelectedItem(item);
    selecting = false;
}

private Object lookupItem(String pattern) {
    String buscar = pattern;
    Object selectedItem = model.getSelectedItem();
    if(selectedItem != null) {
        buscar = caracteresParaBusca.toString();
    }

    for (int i = 0, n = model.getSize(); i < n; i++) {
        Object currentItem = model.getElementAt(i);
        // current macth with the pattern?
        if (qualquerParte(currentItem.toString(), buscar)) {
            return currentItem;
        }
       }

    return null;
}

private boolean qualquerParte(String str1, String str2) {
    return str1.toUpperCase().contains(str2.toUpperCase());
}