JTable : column header with subheaders

So there's no standard feature for that (like in HTML)-- you basically have to implement it all yourself?

Similar Messages

JTable - Check box in column header with sorting

Hello
I have 3 problems/questions.
1. When adding sorting to a table with
setAutoCreateRowSorter(true);and you click on a column header, normally a sorting arrow will appear, and indicate in what direction its sorting,
but in the column head with the checkbox, even though the sorting works, the arrow will never appear. Is there anyway to fix this?
2. Is there anyway to get the checkboxes in the table cells to be aligned left (I dont mean the columnheader checkbox, but the ones below)?
3. When you click on the columnheader to either sort or check the checkbox, you will have to wait about a second between each click, or else it won't react and won't sort. sometimes you will have to click twice for it to react. If you click a lot of times fast, then it won't react until you stop for a second, and click again, though it will react only on the first click, but not the secont, third, fourh, and so on, until you stop for a second. Is there anyway to fix this, or atleast make it have a better reaction time?
This is the code for creating the table:
public class Example extends JFrame{
    private Container container;
    private JTable exampleTable;
    public Example(){
        container = getContentPane();
        ExamleTableModel examleTableModel = new ExamleTableModel();
        exampleTable = new JTable(examleTableModel);
        TableColumn tc = exampleTable.getColumnModel().getColumn(0);
        tc.setCellEditor(exampleTable.getDefaultEditor(Boolean.class));
        tc.setCellRenderer(exampleTable.getDefaultRenderer(Boolean.class));
        tc.setHeaderRenderer(new CheckBoxHeader(new MyItemListener()));
        container.add(new JScrollPane(exampleTable), BorderLayout.SOUTH);
        exampleTable.setAutoCreateRowSorter(true);
        setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
        this.pack();
        setSize(500,500);
        setVisible(true);
    }This is the code for the checkboxheader:
    class MyItemListener implements ItemListener
            public void itemStateChanged(ItemEvent e) {
                Object source = e.getSource();
                if (source instanceof AbstractButton == false) return;
                boolean checked = e.getStateChange() == ItemEvent.SELECTED;
                for(int a = 0, b = exampleTable.getRowCount(); a < b; a++) {
                    for(int c = 0, d = exampleTable.getRowCount(); c < d; c++) {
                        if(exampleTable.getColumnName(c).equals("")){
                            exampleTable.setValueAt(new Boolean(checked),a,c);
    class CheckBoxHeader extends JCheckBox
        implements TableCellRenderer, MouseListener {
        protected CheckBoxHeader rendererComponent;
        protected int column;
        protected boolean mousePressed = false;
        public CheckBoxHeader(ItemListener itemListener) {
            rendererComponent = this;
            this.setHorizontalAlignment(JLabel.LEFT);
            rendererComponent.addItemListener(itemListener);
        public Component getTableCellRendererComponent(
                JTable table, Object value,
                boolean isSelected, boolean hasFocus, int row, int column) {
            if (table != null) {
                JTableHeader header = table.getTableHeader();
                if (header != null) {
                    rendererComponent.setForeground(header.getForeground());
                    rendererComponent.setBackground(header.getBackground());
                    rendererComponent.setFont(header.getFont());
                    header.addMouseListener(rendererComponent);
            setColumn(column);
            rendererComponent.setText("");
            setBorder(UIManager.getBorder("TableHeader.cellBorder"));
            return rendererComponent;
        protected void setColumn(int column){this.column = column;}
        public int getColumn(){return column;}
        protected void handleClickEvent(MouseEvent e) {
            if (mousePressed) {
                mousePressed=false;
                JTableHeader header = (JTableHeader)(e.getSource());
                JTable tableView = header.getTable();
                TableColumnModel columnModel = tableView.getColumnModel();
                int viewColumn = columnModel.getColumnIndexAtX(e.getX());
                int column = tableView.convertColumnIndexToModel(viewColumn);
                if (viewColumn == this.column && e.getClickCount() == 1 && column != -1) {
                    doClick();
        public void mouseClicked(MouseEvent e) {
            boolean active=true;
            JTableHeader header = (JTableHeader)(e.getSource());
            switch (e.getID()) {
            case MouseEvent.MOUSE_CLICKED:
            case MouseEvent.MOUSE_PRESSED:
            case MouseEvent.MOUSE_RELEASED:
                JTable tableView = header.getTable();
                TableColumnModel columnModel = tableView.getColumnModel();
                int viewColumn = columnModel.getColumnIndexAtX(e.getX());
                int column = tableView.convertColumnIndexToModel(viewColumn);
                Rectangle bounds = tableView.getCellRect(-1, column, false);
                if (e.getX() > bounds.x + 16) { // only if one the checkbox
                    if (e.getID() == MouseEvent.MOUSE_CLICKED) {active = false;}
                }else{active=true;}
            if(active){
                handleClickEvent(e);
                ((JTableHeader)e.getSource()).repaint();
        public void mousePressed(MouseEvent e){mousePressed = true;}
        public void mouseReleased(MouseEvent e){}
        public void mouseEntered(MouseEvent e){}
        public void mouseExited(MouseEvent e){}
}If you want the code for the ExamleTableModel, I will post it if you ask (having trouble with the character limit).

What are you supposed to cast it to? I might have tried to cast it to something wrong.
I tried
TableCellRenderer tcr = table.getDefaultRenderer(Boolean.class);
((DefaultTableCellRenderer)tcr).setHorizontalAlignment(SwingConstants.LEFT);and that gave me a ClassCastException. But I might have been trying to cast it to the wrong thing.

Multi-colored JTable column heading? How?

Hi,
I'm looking for a way to have JTable column heading text
that can be displayed in multiple colors, so one string
in one column header, might have each letter a different
color.
My application requires highlighting some of the letters
of a word as red, while others are normal text (black).
I've been using multi-line strings to simulate vertical
naming for my column header, for example:
PPP
I I I
N N N
1 2 3
for PIN1, PIN2, PIN3. The column data has a binary
one or zero for each pin, grouped together in one JTable
column. In my application, if there is an error, I want to
color just the text representing, say PIN2 red and leave
the surrounding PIN1 and PIN3 black.
What approach should I take for doing this with JTable?
Thanks!
John Roberts
[email protected]

You should override the default cell renderer used by Java
- JTable.getTableHeader().setDefaultRenderer(yourRenderer)
Extend yourRenderer from JLabel and use HTML tags to change the color.
- setText on JLabel with the HTML code like "<HTML> <BODY> <FONT COLOR="red"> A </FONT> <FONT COLOR="green"> B </FONT></BODY> </HTML>"

(simple q) how do I change the font in a JTable column header? thanks

how do I change the font in a JTable column header?
thanks

JTableHeader header = yourTable.getTableHeader();
// Set to serif, bold, size 12...
header.setFont( new java.awt.Font( "serif", 1, 12 ) );
// you can set others like color and border, too.
header.setBackground(Color.white);
header.setBorder( new EmptyBorder(15,2,15,2) );

JTable Column Header Problem, Please help me

What Listener I have to used to get the column index when user change the width of column header using mouse.

There is no listener that reports this activity. The TableColumnModelListener can only tell you if columns change position or are added/removed from the column model.
To detect changes, you will need to use a brute force mechanism, namely, to extend the JTableHeader class just a bit.
When the user clicks on a header to resize a column, there is a property in JTableHeader called ResizingColumn that has a type of TableColumn. It is set by the UI delegate when the drag operation starts to the column being resized. When the drag operation ends, the value of ResizingColumn is set to null. You might start with something like this:
JTable table = new JTable(...);
MyTableHeader header = new MyTableHeader();
table.setHeader(header);
table.setModel(...);
class MyTableHeader extends JTableHeader
    public void setResizingColumn(TableColumn column)
        super.setResizingColumn(column);
        if (column != null)
            System.out.println("Resizing Column #" + column.getModelIndex());
        else
            System.out.println("Resizing Ended");
}This will only work for user resizing of columns, not for sizes changed programmatically or by the automatic sizing features of the header.
Mitch Goldstein
Author, Hardcore JFC (Cambridge Univ Press)
[email protected]

How to have a combobox in JTable column header?

Any simple ways for doing this? I am trying to get a filter to a JTable, so that only the rows containing the selected value in that column would be shown.
I first need to get this combobox into the header of a column.

Thanks.
I have already tried with this way, but it was too long and complicated to implement into my file.
Could someone post the principles here.
Like this:
// create my combobox
JComboBox myBox = new JComboBox();
myBox.addItem("Cat");
myBox.addItem("Dog");
// put the combobox to column header
??? ANY CODE HERE ???
Tnx ahead!
OK!
AUlo

JTable column header to span multiple columns

Hi people. I've spent the last day trying to do this with no luck. Most of the links in the forum are old and don't exist any more and the ones that lead to some code end up not working on java 5 (I can compile and run but the result is not what I wanted)!
So my question is this, how do I have a column header that spans more than one column, which has individual column headers below it?
Thanks, Paul.
EDIT: I should point out that this is the place I've tried and although the screen shot of the first example looks exactly like what I want to do, it does not work as advertised. [http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples1.html]
Edited by: Boomah on 05-Nov-2008 15:08

Something like this?import java.awt.Dimension;
import java.awt.GridLayout;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.TableColumnModelEvent;
import javax.swing.event.TableColumnModelListener;
import javax.swing.table.*;
public class MultiSpanHeader {
   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         @Override
         public void run() {
            new MultiSpanHeader().makeUI();
   public void makeUI() {
      final JTable table = new JTable(5, 6);
      final JTableHeader header = table.getTableHeader();
      header.setReorderingAllowed(false);
      final TableColumnModel model = table.getColumnModel();
      Enumeration<TableColumn> enumColumns = model.getColumns();
      final List<TableColumn> columns = Collections.list(enumColumns);
      final JTable dummy = new JTable(0, 3);
      final JTableHeader dummyHeader = dummy.getTableHeader();
      dummyHeader.setReorderingAllowed(false);
      dummyHeader.setResizingAllowed(false);
      final TableColumnModel dummyModel = dummy.getColumnModel();
      Enumeration<TableColumn> enumDummyColumns = dummyModel.getColumns();
      final List<TableColumn> dummyColumns = Collections.list(enumDummyColumns);
      model.addColumnModelListener(new TableColumnModelListener() {
         @Override
         public void columnAdded(TableColumnModelEvent e) {
         @Override
         public void columnRemoved(TableColumnModelEvent e) {
         @Override
         public void columnMoved(TableColumnModelEvent e) {
         @Override
         public void columnMarginChanged(ChangeEvent e) {
            dummyColumns.get(0).setWidth(columns.get(0).getWidth());
            dummyColumns.get(1).setWidth(columns.get(1).getWidth() +
                  columns.get(2).getWidth());
            dummyColumns.get(2).setWidth(columns.get(3).getWidth() +
                  columns.get(4).getWidth() + columns.get(5).getWidth());
         @Override
         public void columnSelectionChanged(ListSelectionEvent e) {
      JScrollPane pane = new JScrollPane(table);
      pane.setPreferredSize(new Dimension(600, 200));
      JFrame frame = new JFrame();
      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.add(pane);
      frame.pack();
      JPanel panel = new JPanel(new GridLayout(2, 1));
      panel.add(dummyHeader);
      panel.add(header);
      pane.getColumnHeader().setView(panel);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
}Note: this is just presented as an idea, would need a lot of work to make it robust and flexible enough for practical use.
db

How to change JTable column header text

How do you set the text in the JTable column headers? I know you can create a JTable specifying the text in an array:
<li>JTable(Object[][] rowData, Object[] columnNames)
But if you create the JTable specifying a TableModel,
<li>JTable(TableModel dm)
the header text defaults to "A", "B", "C", etc. I cannot figure out how to access the text in the header names so it can be changed to something useful. I know how to get the JTableHeader for the table, but it does not seem to have methods for actually setting header values.

I'm sure that model allows you to specify header values so you don't have to do so manually. I would be very surprised if it didn't override the default getColumnName() method to provide a reasonable names.She wasn't writing the class, but [url http://forums.oracle.com/forums/thread.jspa?messageID=9200751#9200751]outlining a design for me to implement. And, based on a previous comment I had made, I think she assumed I wanted the new design to look as much like the old as possible. There were no headers in the original design, which wasn't even a table.
Anyway, this works:
    final static String statisticsColumnNames[] = {
     "Type", "Count",
     "Red QE", "Green QE", "Blue QE", "Average QE",
     "Distance"
     qErrors = new QEBeanTableModel();
     JTable errorTable = new JTable(qErrors);
     TableColumnModel tcm = errorTable.getColumnModel();
     for (int col = 0; col < statisticsColumnNames.length; col++)
         tcm.getColumn(col).setHeaderValue(statisticsColumnNames[col]);
It looks like setHeaderValue() on the TableColumn is what I was looking for.Again, only used if you are dynamically changing the values at run time or you don't like the defaults provided by the Bean-aware model.I coded the above before I read your last post. The QEBeanTableModel is extremely specific to my program. I.e. I cannot imagine it being used anywhere else. Would it still be better to implement a getColumnName() within the table model? Looking at your [url http://www.camick.com/java/source/RowTableModel.java]RowTableModel.java source, I can see that it would not be difficult to do so.
Just decided to add the getColumnName() method. This whole sub-project is based on implementing a clean modern design (and learning about Java Beans). You've clearly stated twice that the method I have implemented is for dynamic header values only, which has already answered what I asked last paragraph.

Arrow on JTables column header

Hey guys,
I have a few dialogs with tables on etc, everythings fine, its just one table when the program runs, when u hovver(sp?) over the line on the column header it normally turns into a black arrow like so <--> and the you can resize it.
But this one table wont do that, ive created these in netbeans and just cant see the difference with the other tables. the columns are still resizable just remains an normal arrow though rather than <-->
Thanks for any help

You can't resize the column if use the code below,but the arrow will display
TableColumn tableColumn = this.getTableHeader().getColumnModel().getColumn(i);
                         tableColumn.setPreferredWidth(columnsize);
                         tableColumn.setMinWidth(columnsize);
                         tableColumn.setMaxWidth(columnsize);reply if it help you..

ALV column header with multiple rows and ALV column header span

How could I have in an ALV a column header on several lines and/or a column header that spans on multiple columns?
i.e. I would like to have in an ALV two columns, each with it's own distinct header and additionally another column header for both of the columns, that spans across both columns. How could I program this?

Hi,
follow below mentioned code
SET THE LABEL OF THE COLUMN
DATA: hr_weeknum TYPE REF TO cl_salv_wd_column_header.
CALL METHOD lr_weeknum->get_header
RECEIVING
value = hr_weeknum.
CALL METHOD lr_weeknum->set_resizable
EXPORTING
value = abap_false.
hr_weeknum->set_prop_ddic_binding_field(
property = if_salv_wd_c_ddic_binding=>bind_prop_text
value = if_salv_wd_c_ddic_binding=>ddic_bind_none ).
set the text of the column
CALL METHOD hr_weeknum->set_text
EXPORTING
value = 'C Form'.
Regards,
Srini.

Selecting multiple rows using column header with checkbox in it.

Dear All.,
I am trying to select multiple rows with checkbox in column header but it doesnot works...
Following is my codel
<af:table value="#{bindings.xx.collectionModel}"
                      var="row"
                      rows="#{bindings.xx.rangeSize}"
                      emptyText="#{bindings.xx.viewable ? 'No data to display.' : 'Access Denied.'}"
                      fetchSize="#{bindings.xx.rangeSize}"
                      rowBandingInterval="1"
                      filterModel="#{bindings.xx.queryDescriptor}"
                      queryListener="#{bindings.xx.processQuery}"
                      varStatus="vs" partialTriggers="sbcSelectAll sbcChkFlag"
                      selectedRowKeys="#{bindings.xx.collectionModel.selectedRow}"
                      selectionListener="#{bindings.xx.collectionModel.makeCurrent}"
                      rowSelection="none" id="tCdMast" width="400"
                      columnStretching="column:c4" inlineStyle="height:200px;">
              <af:column sortProperty="ChkFlag" filterable="true"
                         sortable="true"
                         headerText="#{bindings.xx.hints.ChkFlag.label}"
                         id="c2" width="55"
                         inlineStyle="#{row.ChkFlag ? 'background-color:#9CACC9;' : ''}">
                <af:selectBooleanCheckbox simple="true" value="#{row.ChkFlag}"
                                          selected="#{row.ChkFlag}" id="sbcChkFlag"
                                          autoSubmit="true" immediate="true"/>
                <f:facet name="header">
                  <af:selectBooleanCheckbox simple="true"
                                            autoSubmit="true"
                                            valueChangeListener="#{xxBean.onTableChkAllCheckChanged}"
                                            id="sbcSelectAll"/>
                </f:facet>
              </af:column>
</af:table>
Managed Bean
    public void onTableChkAllCheckChanged(ValueChangeEvent valueChangeEvent) {
        Boolean newValue =
            Boolean.valueOf(u.nvlString(valueChangeEvent.getNewValue(),
                                        "false"));
        Boolean oldValue =
            Boolean.valueOf(u.nvlString(valueChangeEvent.getOldValue(),
                                        "false"));
        if (newValue.equals(oldValue))
            return;
        int rowIndex=0;
        ViewObject vo = u.findIterator("xxIterator").getViewObject();
        vo.reset();
        while(vo.hasNext()){
          Row row;
          if(rowIndex==0)
              row=vo.first();
          else
              row=vo.next();
             row.setAttribute("ChkFlag", newValue.booleanValue());
          rowIndex=1;
        u.addPartialTargets(tableDocuments);
    }Please help!!.
Thanks & Regards,
Santosh.
jdeve 11.1.1.4.0

Can you check this sample in the blog post?
http://sameh-nassar.blogspot.com/2009/12/use-checkbox-for-selecting-multiple.html
Thanks,
Navaneeth

Sort by clicking on the column heade with LIFO

Good morning!
I would like to sort by last entry is first (LIFO) in my report.
To do that, I have to un check in sort:
Home>Application Builder>Application ***>Page 1>Report Attributes*(Otherwise APEX shows: "Your query can't include an "ORDER BY" clause when having column heading sorting enabled.")*
When I follow the APEX suggestion, my report lost feature to sort by clicking on the column header.
I still want to keep sorting ability on any column just by clicking on the column header.
Thanks in advance,
Sam

Sam,
First remove the order by clause from your query and then try to set the sorting using the sort sequence. Thanks.
Regards,
--Manish

How to use JButton as a JTable column header?

I'd like to use JButtons as my JTable's column headers.
I built a JButton subclass which implemented TableCellRenderer and passed it to one of my table column's setHeaderRender method. The resulting header is a component that looks like a JButton but when clicked, it does not visually depress or fire any ActionEvents.

You might want to check this example and use it accordingly for your requirements.
http://www2.gol.com/users/tame/swing/examples/JTableExamples5.html
Reason: The reason you're unable to perform actions on JButton is JTableHeader doesn't relay the mouse events to your JButtons.
I hope this helps.
have fun, ganesh.

JTable column names with custom model

I'm having problems with column names in a JTable which uses a custom model. For some reason, the colums are being shown as A, B, C etc. The data, however, displays fine.
This is the code which constructs the table.
MyTableModel tableModel = new MyTableModel(myArrayList);
myTable = new JTable(tableModel);
myTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
myTable.setFillsViewportHeight(true);This is the class, MyTableModel
class MyTableModel extends AbstractTableModel {
        private ArrayList<Account> data;
        private String[] colNames = {"", "Name","Type","Group","Created","Modified"};
        public MyTableModel(ArrayList<Account> data) {
            this.data = data;
        public int getRowCount() {
            return data.size();
        public int getColumnCount() {
            return 6;
        public Object getValueAt(int row, int col) {
            Account account = (Account)data.get(row);
            switch(col) {
                case 0:
                    return account.getIcon();
                case 1:
                    return account.getName();
                case 2:
                    return account.getType();
                case 3:
                    return account.getGroup();
                case 4:
                    return account.getDateCreated();
                case 5:
                    return account.getDateModified();
                default:
                    return "";
        public String getColumName(int index) {
         System.out.println("N:"+colNames[index]);
            return colNames[index];
    }When the table is displayed, nothing's displayed to the console, but I'd have thought getColumnName would print the current column name. Am I missing something obvious?

Oh great. I'll go back under my rock.
Thanks =)

JTable column header

Hello,
I have the following code:
          JPanel p = new JPanel (new BorderLayout());
          String[] c = {"Other Node", "Direction", "Annotation"};
          Object[][] d = {{"a", "b", "c"}};
          JTable t = new JTable(d, c);
          p.add(t);The problem is that I dont see the column headers (eg "Other node" etc), but I do see the column data, in this case: "a", "b", "c".
Why I cant see they column headers?
Thank you,

See this...
http://java.sun.com/docs/books/tutorial/uiswing/components/table.html#simple
It says if you are not using a scroll pane, you should get the table header using the getTableHeader() and add yourself to the container.
Hope it helps
thanks

JTable : column header with subheaders

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