ajax update a column header when changing a cell

[Eyal Golan]

Hi,
I have a DataTable in which two columns are holding checkboxes (when
selecting a checkbox, the other in the same row will be unselected). We
chose checkboxes to enable the user to remove selections at all.
I want to add a 'Select All' to the header.
*My problem is how do I get the component of the header to add it to the
ajax checkbox of the column?*
I can solve this problem by adding the whole table to ajax checkboxes, but I
prefer to pass as few lines in the ajax calls.
Here's some code:
    private AbstractColumn newActionCheckboxColumn(final String
approvedRejectReassign) {
        AbstractColumn p = new AbstractColumn(new
ResourceModel("EditingTasksTablePanel." + approvedRejectReassign)) {
            private static final long serialVersionUID = 1L;

            public void populateItem(Item cellItem, String componentId,
IModel rowModel) {
                EditingTask task = (EditingTask) rowModel.getObject();
                cellItem.add(new TaskActionCheckboxPanel(componentId, task,
approvedRejectReassign, cellItem.getParent()
                        .getParent()));
            }

            @Override
            public Component getHeader(String componentId) {
                return new TaskActionCheckboxAllPanel(componentId,
dataProvider, "all"+approvedRejectReassign,
                        EditingTasksTablePanel.this);
            }
        };
        return p;
    }

    TaskActionCheckboxPanel(String id, final EditingTask task, String
approveRejectProperty,
            final Component... rowComponent) {
        super(id);
        final AjaxCheckBox checkbox = new AjaxCheckBox("checkbox", new
PropertyModel(task, approveRejectProperty)) {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                for (Component component : rowComponent) {
                    target.addComponent(component);
                }
            }
        };
        add(checkbox);
    }

    public TaskActionCheckboxAllPanel(String id,
EditingTasksSortableDataProvider tasksSortableDataProvider,
            String checkAllProperty, final Component updatedComponent) {
        super(id);
        final AjaxCheckBox checkbox = new AjaxCheckBox("checkbox", new
PropertyModel(tasksSortableDataProvider,
                checkAllProperty)) {
            private static final long serialVersionUID = 1L;

            @Override
            protected void onUpdate(AjaxRequestTarget target) {
                target.addComponent(updatedComponent);
            }
        };
        add(checkbox);
        this.setOutputMarkupId(true);
    }

* I will make the two panels the same after doing all changes...

thanks

Eyal Golan
egola...@gmail.com

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