Editable Combobox in a JTable

Hi All,
I have a editable combobox in a normal JTable as one of columns.Can any body help me to set the size to the entered text in editable combobox. Means if I set the length to 5 then it should accpet only 5 characters.so how to achive it ??
Regards
Suresh

First get cell editor that should be a combobox. Then get its editor that should be text box and then set its size.

Similar Messages

How to retrieve value from ComboBox inside a Jtable

Hi everyone, I've this problem: I used the code that I founded to this link:
[http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#combobox|http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#combobox]
So I inserted a comboBox in my Jtable but I don't retrieve comboBox's values.
I tried to retrieve these values in this way:
myTable1.getModel().getValueAt(rowIndex, columnIndex).getClass();but this code produce a NullPointerException.
thank you for helping me!!!!

but I don't retrieve comboBox's valuesCorrect, because the combo box and its data is not part of the TableModel. The TableModel only stores the item that was selected from the combo box when the cell was edited.
If you are getting an exception it is because you haven't set any data in your table model for the given cell.
If you need further help then you need to create a [Short, Self Contained, Compilable and Executable, Example Program (SSCCE)|http://homepage1.nifty.com/algafield/sscce.html], that demonstrates the incorrect behaviour.
Don't forget to use the Code Formatting Tags so the posted code retains its original formatting. That is done by selecting the code and then clicking on the "Code" button above the question input area.

ComboBox size in JTable

How do you set the size of a combobox inside a JTable cell. I have used setPreferredWidth but the ccombo box is still huge. I have done searches and not found any answers.
Thanks

I've always let the UI take care of it. I don't set the minimum, maximum or preferred sizes and the UI sets the size to the size fo the cell.

Set border color of editable ComboBox on focus

What I want to do, is set BorderBrush of editable ComboBox. I'm using slightly modified default WPF templates. They are structured like below:
<ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
<Grid x:Name="templateRoot" ...>
<ToggleButton x:Name="toggleButton" ... />
<Border x:Name="border" ...>
<TextBox x:Name="PART_EditableTextBox" ... />

</Border>
</Grid>
</ControlTemplate>
ToggleButton template:
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border x:Name="templateRoot" ...> 
<Border x:Name="innerBorder" ...> 
<Border x:Name="splitBorder" ...>
<Path x:Name="arrow" ... />
</Border>
</Border>
</Border>
</ControlTemplate>
And now, what should happen.
When PART_EditableTextBox.IsFocused is equal to true then set
templateRoot.BorderBrush and innerBorder.BorderBrush to another color (for example red and blue).
It would be very simple if there was only one BorderBrush to set, because I could use
TemplateBinding to bind this property to ToggleButton element.
For me, the problem are nested templates. I don't know how to refer to inside of another template.
I hope you can help me.
It would be very good if I didn't need to use C# code, just XAML.

>>I don't know how to refer to inside of another template.
You cannot. But since the PART_EditableTextBox is part of the ControlTemplate of the ComboBox you could add the trigger to this control template and then for example set the BorderBrush property and the Background propery of the ToggleButton and bind these
to the BorderBrush properties of the Borders in its ControlTemplate:
<ControlTemplate x:Key="ComboBoxEditableTemplate" TargetType="{x:Type ComboBox}">
<TextBox x:Name="PART_EditableTextBox" ... />
<ToggleButton x:Name="toggleButton" ... />
<ControlTemplate.Triggers>
<Trigger Property="IsFocused" Value="True" SourceName="PART_EditableTextBox">
<Setter Property="BorderBrush" TargetName="toggleButton" Value="Red"/>
<Setter Property="Background" TargetName="toggleButton" Value="Blue" />
</Trigger>
</ControlTemplate.Triggers>
<Style x:Key="ComboBoxToggleButton" TargetType="{x:Type ToggleButton}">
<Setter Property="OverridesDefaultStyle" Value="true"/>
<Setter Property="IsTabStop" Value="false"/>
<Setter Property="Focusable" Value="false"/>
<Setter Property="ClickMode" Value="Press"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border x:Name="templateRoot" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="2">
<Border x:Name="innerBorder" BorderBrush="{TemplateBinding Background}" BorderThickness="2">
<Border x:Name="splitBorder">
<Path x:Name="Arrow" Data="{StaticResource DownArrowGeometry}"
Fill="Black" HorizontalAlignment="Center" Margin="0,1,0,0" VerticalAlignment="Center"/>
</Border>
</Border>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
If you don't want to use the Background property for this, the other option is to create your own custom class that derives from the ToggleButton class and add a dependency property called "InnerBackground" or something to this class and replace
the ToggleButton with your custom ToggleButton and replace the binding to the Background property with a binding to the new dependency property and set this one in the control template for the ComboBox.
Hope that helps.
Please remember to close your threads by marking helpful posts as answer and/or helpful and please start a new thread if you have a new question.

Combobox Renderer in JTable

Can someone please post code showing me how to make a renderer that would indicate a combobox in a JTable? I already have the combobox editor there, but I want the renderer to show a small down arrow, indicating to the user that the cell is a combobox.
Thanks!

public class ComboBoxRenderer extends JComboBox implements TableCellRenderer{
    public ComboBoxRenderer(Vector items) {
        super(items);
    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column){
        if (isSelected && !hasFocus){
            setBackground(table.getSelectionBackground());
            setForeground(table.getSelectionForeground());
        }else{
            setBackground(table.getBackground());
            setForeground(table.getForeground());
        setSelectedItem(value);
        return this;
[/code[

2 editable combobox questions

1. addKeyListener(..) not working onto editable combobox.
2. how to scroll the editable combobox when user types into it?
(in case of solving 1st problem, this one is solved too). Maybe there are special methods??
Thank you very much.
Boris.

1) you need to add the listener to the editor of the combobox, no the combobox itself.
2) scroll? I thought it already does an auto select if there is a value in the list which starts with what's typed.

Editable JComboBox in a JTable

I posted my problem into the "Java Essentials/Java programming" forum but it would be much better if I'd posted it here into the swing theme :).
Here it is what I posted:
Funky_1321
Posts:8
Registered: 2/22/06
editable JComboBox in a JTable
Oct 21, 2006 1:32 PM
Click to email this message
Hello!
Yesterday I posted a problem, solved it and there's another one, referring the same theme.
So it's about a editable JComboBox with autocomplete function. The combo is a JTables cellEditors component. So it's in a table. So when the user presses the enter key to select an item from the JComboBox drop down menu, I can't get which item is it, not even which index has the item in the list. If for exemple the JComboBox isn't in a table but is added on a JPanel, it works fine. So I want to get the selectedItem in the actionPerformed method implemented in the combo box. I always get null instead of the item.
Oh... if user picks up some item in the JComboBox-s list with the mouse, it's working fine but I want that it could be picked up with the enter key.
Any solutions appreciated!
Thanks, Tilen
YAT_Archivist
Posts:1,321
Registered: 13/08/05
Re: editable JComboBox in a JTable
Oct 21, 2006 1:55 PM (reply 1 of 2)
Click to email this message
I suggest that you distill your current code into a simple class which has the following attributes:
1. It can be copied and pasted and will compile straight out.
2. It has a main method which brings up a simple example frame.
3. It's no more than 50 lines long.
4. It demonstrates accurately what you've currently got working.
Without that it's hard to know exactly what you're currently doing, and requires a significant investment of time for someone who hasn't already solved this problem before to attempt to help. I'm not saying that you won't get help if you don't post a simple demo class, but it will significantly improve your chances.
Funky_1321
Posts:8
Registered: 2/22/06
Re: editable JComboBox in a JTable
Oct 21, 2006 2:11 PM (reply 2 of 2)
Click to email this message
Okay ... I'll write the code in short format:
class acJComboBox extends JComboBox {
public acJComboBox() {
    this.setEditable(true);
    this.setSelectedItem("");
    this.getEditor().getEditorComponent().addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) {
     // ... code code code
     // that's tricky ... the method getSelectedItem() always returns null - remember; the acJComboBox is in a JTable!
     if (e.getKeyCode() == 10 && new String((String)getEditor().getItem()).length() != 0) { getEditor().setItem(getSelectedItem()); }
}And something more ... adding the acJComboBox into the JTable:
TableColumn column = someTable.getColumn(0);
column.setCellEditor(new DefaultCellEditor(new acJComboBox());
So if the user presses the enter key to pick up an item in the combo box drop down menu, it should set the editors item to the selected item from the drop down menu (
getEditor().setItem(getSelectedItem());
When the acJComboBox is on a usual JPanel, it does fine, but if it's in the JTable, it doesn't (getSelectedItem() always returns null).
Hope I described the problem well now ;).

Okay look ... I couldn't write a shorter code just for an example. I thought that my problem could be understoodable just in mind. However ... type in the first combo box the letter "i" and then select some item from the list with pressing the enter key. Do the same in the 2nd combo box who's in the JTable ... the user just can't select that way if the same combo is in the JTable. Why? Thanks alot for future help!
the code:
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.Vector;
import javax.swing.DefaultCellEditor;
import javax.swing.DefaultComboBoxModel;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextField;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableColumn;
class Example extends JFrame {
    private String[] columns = { "1", "2", "3" };
    private String[][] rows = {};
    private DefaultTableModel model = new DefaultTableModel(rows, columns);
    private JTable table = new JTable(model);
    private JScrollPane jsp = new JScrollPane(table);
    private acJComboBox jcb1 = new acJComboBox();
    private acJComboBox jcb2 = new acJComboBox();
    public Example() {
        // initialize JFrame
        this.setLayout(null);
        this.setLocation(150, 30);
        this.setSize(300, 300);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        // initialize JFrame
        // initialize components
        Vector<String> v1 = new Vector<String>();
        v1.add("item1");
        v1.add("item2");
        v1.add("item3");
        jcb1.setData(v1);
        jcb2.setData(v1);
        jcb1.setBounds(30, 30, 120, 20);
        jsp.setBounds(30, 70, 250, 100);
        add(jcb1);
        add(jsp);
        TableColumn column = table.getColumnModel().getColumn(0);
        column.setCellEditor(new DefaultCellEditor(jcb2));
        Object[] data = { "", "", "" };
        model.addRow(data);
        // initialize components
        this.setVisible(true);
    public static void main(String[] args) {
        Example comboIssue = new Example();
class acJComboBox extends JComboBox {
    private Vector<String> data = new Vector<String>();
    private void init() {
        this.setEditable(true);
        this.setSelectedItem("");
        this.setData(this.data);
        this.getEditor().getEditorComponent().addKeyListener(new KeyAdapter() { public void keyReleased(KeyEvent e) {
                    if (e.getKeyCode() != 38 && e.getKeyCode() != 40) {
                        String a = getEditor().getItem().toString();
                        setModel(new DefaultComboBoxModel());
                        int st = 0;
                        for (int i = 0; i < getData().size(); i++) {
                            String str1 = a.toUpperCase();
                            String tmp = (String)getData().get(i).toUpperCase();
                            if (str1.length() <= tmp.length()) {
                                String str2 = tmp.substring(0, str1.length());
                                if (str1.equals(str2)) {
                                    DefaultComboBoxModel model = (DefaultComboBoxModel)getModel();
                                    model.insertElementAt(getData().get(i), getItemCount());
                                    st++;
                        getEditor().setItem(new String(a));
                        JTextField jtf = (JTextField)e.getSource();
                        jtf.setCaretPosition(jtf.getDocument().getLength());
                        hidePopup();
                        if (st != 0 && e.getKeyCode() != 10 && new String((String)getEditor().getItem()).length() != 0) { showPopup(); }
                        if (e.getKeyCode() == 10 && new String((String)getEditor().getItem()).length() != 0) { getSelectedItem(); }
                        if (new String((String)getEditor().getItem()).length() == 0) { whenEmpty(); }
        this.addMouseListener(new MouseAdapter() { public void mouseReleased(MouseEvent e) {
            hidePopup();
    // - constructors -
    public acJComboBox() {
        init();
    public acJComboBox(Vector<String> data) {
        this.data = data;
        init();
    // - constructors -
    // - interface -
    public void whenEmpty() { } // implement if needed
    public void setData(Vector<String> data) {
        this.data = data;
        for (int i = 0; i < data.size(); i++) {
            this.addItem(data.get(i));
    public Vector<String> getData() {
        return this.data;
    // - interface -
}

Losing focus on editable combobox

Hi everyone!
I have created a combobox and setEditable is set to true but it does not react to the focus lost method.But when the setEditable is set to false then the focus lost method is executed. According to the following Sun Developer sites(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6433257,
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4628933) this is some kind of bug.
Is there no way that I can have an editable combobox that reacts to the focus lost method I mean that loses focus?

When you have an editable combo box the editor has focus, not the combox box. So I guess you would need to add the FocusListener to the editor itself and not the combo box directly.

Please help! How to add a combobox on a jtable

Hi, I have seen on google and here many codes to add a combobox in a jtable but none of them seem to work, I need the urgently.
My problem is that I must add a comboBox or a JComboBox to a cell inside a JTable on a predefined column. It means that on the column 2 I must add diferent comboboxes for eac row. How can I do it, please help.

The celleditor is the component shown and the cellrenderer is the first render of a component in the cell and dont have to be the same jcombo box?
The code on ther post does this:?
returning a diferent combobox for all the cells on the column depending on the row selected, but as long as only one cell can be selected at a time it seems to hace different jcomboboxes added a time?
Is there anyway to render any combobox with different values, my program must let the user chose the teacher it want to teach a definen subject, so the combo must have the teacher of a subject loaded on a database, the combos are not constants. I guess I can manage to use the way you showed me, but is there anyway to render a combo just by adding it to a cell! maybe doing changes to the tablemodel or things like that?

Editable Combobox in ADF

Hi
is it possible to make the combobox editable ?
pls advice

HI Sireesha Pinninti ,
yaa , Normal combobox is not editable
is there any alternative for Editable combobox similar to InputComboBoxListofValues
my requirement is if i have a Country combo box with 2 option India and US , if the enmd user want to opt China , he could type tht
pls advice
Regards
Jeethi George

Editable ComboBox in JOptionPane

Can we have an editable comboBox in JOptionPane. Everything matches my requirements in the JOptionPane except that the comboBox is non editable. Can I make it editable instead of writting my own class which does this purpose...
??

Actually found something similar which resolves the issue..
Following is the code snippet......
final JPanel panel = new JPanel();
String[] choices = new String[] {"choice1", "choice2"};
final JComboBox combo = new JComboBox(choices);
combo.setEditable(true);
panel.add(combo);
if (JOptionPane.showConfirmDialog (null, panel,"Save As", JOptionPane.OK_CANCEL_OPTION) ==JOptionPane.OK_OPTION) {
System.out.println("Saving " + combo.getSelectedItem());

Changing the font of a non-editable ComboBox

Hello everyone,
I need a small combobox. So I set a font of a specific size to the combo's
editor. That works nice als long as the combo is editable; but when it becomes
uneditable, the default bold font is used and some items don't fit in the
field any more. How to prevent this?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.plaf.*;
class ComboEditorFont extends JFrame {
Font fontM= new Font("Monospaced", Font.PLAIN, 13);
public ComboEditorFont() {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setSize(100,100);
    setLayout(null);
// Changing the font in the UIManager doesn't work either
/*    Font defaultComboBoxFont= UIManager.getFont("ComboBox.font");
    FontUIResource fui= new FontUIResource(fontM);
    UIManager.put("ComboBox.font", fontM);
//    UIManager.put("ComboBox.font", fui);
    JComboBox cmb = new JComboBox(new String[]{"ABC","DEF","GHI","LMO"});
    cmb.setBounds(20,20, 48,20);
//    cmb.setEditable(true);
    JTextField editor= (JTextField)(cmb.getEditor().getEditorComponent());
    editor.setFont(fontM);
//    cmb.setRenderer(new MyCellRenderer());
    add(cmb);
//    UIManager.put("ComboBox.font", defaultComboBoxFont);
    setVisible(true);
public static void main(String args[]) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
     new ComboEditorFont();
class MyCellRenderer extends JLabel implements ListCellRenderer {
    public MyCellRenderer() {
      setOpaque(true);
    public Component getListCellRendererComponent(JList list,
                                                   Object value,
                                                   int index,
                                                   boolean isSelected,
                                                   boolean cellHasFocus) {
      setFont(fontM);
      setText(value.toString());
      Color background;
      Color foreground;
      JList.DropLocation dropLocation = list.getDropLocation();
      if (dropLocation!=null && !dropLocation.isInsert() &&
       dropLocation.getIndex() == index) {
     background = Color.BLUE;
     foreground = Color.WHITE;
      } else if (isSelected) {
     background = list.getSelectionBackground();
     foreground = list.getSelectionForeground();
      } else {
     background = list.getBackground();
     foreground = list.getForeground();
      setBackground(background);
      setForeground(foreground);
      return this;
}

- an offense to the english grammarThe exaggeration was meant to be ironic, not mean. Seriously, if a post is unreadable why bother posting it at all?
offense/non offense, I'd start to teach this language on 15/oct/2009, untill now ---> MSDN, ASM,I don't know if you refer to the Java or English language...
Either way, hopefully you have merely started learning it - not teaching it! :o)
- ranging from slightly to completely off-topic
always exists the different way, my off-topic "for you hide" declaracion for topic,
I agreed with some rules, disagre with strict..., Swing = something based on variable interpretations about Java decl., isn't exist stricts borders there, only God can tell us, If is it Swing, or if isn't Swing relevants, not my trully,No, no, I meant "off-topic" with regard to the poster's question: he had tackled the problem for editable comboboxes already, and was specifically talking about non-editable comboboxes, so obviously altering the editor as you suggested was hopeless.
- giving out "coding advice" without any justification
be sure that 99pct from "answers" fired these guys find out the "coding advice" on Go..., on another forum(s), and they will not returns back here anymore, for not-acceptable Hot Potato Games (if is or isn't topic relevant for this forum), I'm afraid the grammar prevented me to understand this whole sentence...
help is by Camickr's company, by German Kommunität (rel. for EU TimeZone), I'm only to learn (somehow) this language, Read - Translate ---> T - Write, An online translation system may help you to read these forums, but really don't post text translated this way!
with peaceFullFace and takeAnyNoticeOfIt kopik,No personal offense meant, I now think you're well-intended (but really awkward all the same).
Edited by: jduprez on Nov 6, 2009 4:06 PM - fixed spelling - mind you, I'm not a native english speaker either!

How to exit edit mode (editable comboBox)?

I have an editable comboBox. When a user clicks on the text
area, he can rename the text and the idea is to click outside the
comboBox to commit the new value.
The problem now is when the user clicks outside the comboBox,
the comboBox remains in edit mode(with the blinking prompt). How do
I make it get out of that mode?
thanks in advance

Hi,
setting comBox.editable=false in the function where you
commit the vaules will solve this purpose.
Also remember to set it in edit mode when click event on the
combobox happens
Ex.
<mx:ComboBox id="comBox" click="setMode()"/>
public function setMode():void{
comBox.editable=true;
I hope I have given you a direction to think upon.
Take care

Editable Combobox component

I have created a application using combobox wherein the
combobox loads the names of the persons from an XML file. I have
created the application using XMLConnector component without
writing a single line of ActionScript code.
The editable property of the combobox is set to true. I would
like the combobox to display the person's names when the user types
the name directly in the editable combobox.
For Example: The combobox contains names like Alfred, John,
Sandy etc
If user types 'J' or 'Jo' the combobox shoud open up and
select the names starting with J.

Use s:DropDownList instead.
Peter

Jquery editable Combobox

Hello All,
Did any body implement the jquery editable combobox? like the combobox in
http://stuff.rajchel.pl/jec/demos/#demo-1
Can you please tell me how to implement this?
that will be a great help

Wanna post it and share with EVERYONE else??
That's the way this works here, sharing and HELPING everyone as a GROUP!
Thank you,
Tony Miller
Webster, TX

Editable Combobox in a JTable

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