Jtable Right Align Header

JTable Right Align Header

Here's an alternate approach to modifying the TableCellRenderer of a table's JTableHeader. It's not strictly necessary for this usage, but it minimizes the impact on the UI delegate's appearance.

Typical usage:

JTable table = new JTable(…);
JTableHeader header = table.getTableHeader();
header.setDefaultRenderer(new HeaderRenderer(table));

Custom header renderer:

private static class HeaderRenderer implements TableCellRenderer {

    DefaultTableCellRenderer renderer;

    public HeaderRenderer(JTable table) {
        renderer = (DefaultTableCellRenderer)
            table.getTableHeader().getDefaultRenderer();
        renderer.setHorizontalAlignment(JLabel.CENTER);
    }

    @Override
    public Component getTableCellRendererComponent(
        JTable table, Object value, boolean isSelected,
        boolean hasFocus, int row, int col) {
        return renderer.getTableCellRendererComponent(
            table, value, isSelected, hasFocus, row, col);
    }
}

How to left or right justify a column header in a JTable

TableCellRenderer renderer = new DefaultTableCellRenderer();
renderer.setHorizontalAlignment(SwingConstants.RIGHT);
table.getColumn(id).setHeaderRenderer(renderer);

Or, if you don't have the column names available:

table.getColumnModel().getColumn(index).setHeaderRenderer(renderer);

JTable Column Headers with wrapped and center aligned text

In your table model class use html of column name

example:

"<html><center>First column</html>"

Set JTable header horizontal alignment based on value renderer column alignment

Here is an example of a custom header renderer that simply makes the text of the selected column Bold:

class MyTableHeaderRenderer implements TableCellRenderer
{
    private TableCellRenderer tableCellRenderer;

    public MyTableHeaderRenderer(TableCellRenderer tableCellRenderer)
    {
        this.tableCellRenderer = tableCellRenderer;
    }

    public Component getTableCellRendererComponent(JTable table, Object value,
        boolean isSelected, boolean hasFocus, int row, int column)
    {
        Component c = tableCellRenderer.getTableCellRendererComponent(
            table, value, isSelected, hasFocus, row, column);

        if (column == table.getSelectedColumn())
            c.setFont(getFont().deriveFont(Font.BOLD));

        return c;
    }
}

You would use the renderer with code like:

JTableHeader header = table.getTableHeader();
DefaultTableCellRenderer defaultRenderer = (DefaultTableCellRenderer)header.getDefaultRenderer();
header.setDefaultRenderer( new MyTableHeaderRenderer(defaultRenderer) );

In your case you would need to change the alignment, not the Font.

You might use code like the following:

TableCellRenderer tcr = table.getCellRenderer(0, column);
Component renderer = table.prepareRenderer(tcr, 0, column);
defaultRenderer.setAlignment( renderer.getAlignment() ); // whatever the alignment method is.

Edit:

Somehow what I've done eliminates the normal formatting for a header

You are using:

tableColumn.getCellRenderer();

should that not be:

tableColumn.getHeaderRenderer();

Rarely would people specify a special renderer for the table header by column. So if a header renderer is not specified for the TableColumn you should just use the default renderer of the JTableHeader, don't create a DefaultTableCellRenderer, this is NOT the renderer used by the table header.

JTable header alignment

one of ways is to set Renderer, TableHeader by default returns JLabel, for example

  final TableCellRenderer tcrOs = myTable.getTableHeader().getDefaultRenderer();
       myTable.getTableHeader().setDefaultRenderer(new TableCellRenderer() {

            @Override
            public Component getTableCellRendererComponent(JTable table, 
                   Object value, boolean isSelected, boolean hasFocus, 
                   int row, int column) {
                JLabel lbl = (JLabel) tcrOs.getTableCellRendererComponent(table, 
                      value, isSelected, hasFocus, row, column);
                lbl.setForeground(AppVariables.textColor);
                lbl.setBorder(BorderFactory.createCompoundBorder(lbl.getBorder(), 
                      BorderFactory.createEmptyBorder(0, 5, 0, 0)));
                lbl.setHorizontalAlignment(SwingConstants.LEFT);
                if (isSelected) {
                    lbl.setForeground(Color.red);
                    lbl.setBackground(Color.lightGray);
                } else {
                    lbl.setForeground(Color.blue);
                    lbl.setBackground(Color.black);
                }
                return lbl;
            }
        });

Align text in a table header

Try:

text-align: center;

You may be familiar with the HTML align attribute (which has been discontinued as of HTML 5). The align attribute could be used with tags such as

<table>, <td>, and <img>

to specify the alignment of these elements. This attribute allowed you to align elements horizontally. HTML also has/had a valign attribute for aligning elements vertically. This has also been discontinued from HTML5.

These attributes were discontinued in favor of using CSS to set the alignment of HTML elements.

There isn't actually a CSS align or CSS valign property. Instead, CSS has the text-align which applies to inline content of block-level elements, and vertical-align property which applies to inline level and table cells.

Align table header (mat-header-cell) right

You use mat-text-column which supports alignment.

<mat-text-column [name]="column" *ngFor="let column of columnsToDisplay" justify="right">
    <th mat-header-cell *matHeaderCellDef mat-sort-header> {{column}} </th>
    <td mat-cell *matCellDef="let element" align="right"> {{element[column]}} </td>
</mat-text-column>

https://stackblitz.com/edit/angular-mnqztk-kwajho?file=src%2Fapp%2Ftable-expandable-rows-example.html

Here is documentation link
https://material.angular.io/components/table/api#MatTextColumn

how do you left-align text in JTableHeader?

Your code affects where the table header itself is positioned, not the items within each header. You need to call getTableHeader().setDefaultRenderer(xxx) with something that left-aligns the types you care about.

Jtable Right Align Header