如何从JavaFX中的TableView中删除CheckBox？

Question

I'm writing a seating chart program using JavaFX. I have a table that keeps a list of students together that holds their name, grade, and whether they are present or absent (using a checkbox). I have a delete button that allows me to delete the students from the list. This works fine, however, whenever I delete the student object, the checkbox does not go along with it. I'm not sure what I would need to add to get that to work. Here is a snippet of the delete code. There are also two images below that show my problem. This is my first post so please let me know if I missed something. Please help! Thanks!

ObservableList<Student> items, sel;
items = currentTable.getItems();
sel = currentTable.getSelectionModel().getSelectedItems();
Student s = new Student("", "", 0, "");
for (Student p : sel) {
    items.remove(p);
    s = p;
}

Before Delete

After Delete

Answer 1

This has nothing to do with the delete or remove method. It has to do with what you did in TableColumn.setCellFactory() .

To get the checkbox you shown, you should have used (in general) one of the two methods:

Overriding updateItem() in TableCell while setting Cell Factory

There is this empty parameter in updateItem() which indicates whether the row is empty or not. You need to use that to determine when not to show the checkbox.

column.setCellFactory(col -> {
    return new TableCell<Foo, Boolean>() {
        final CheckBox checkBox = new CheckBox();

        @Override
        public void updateItem(final Boolean selected, final boolean empty) {
            super.updateItem(selected, empty);

            if (!this.isEmpty()) {
                setGraphic(checkBox);
                setText("");
            }
            else {
                setGraphic(null); // Remove checkbox if row is empty
                setText("");
            }
        }
    }
}

Using CheckBoxTableCell

JavaFX API has this convenient class CheckBoxTableCell that would do all these for you. Most people find this class hard to use because there are 2 things that you need to ensure to use it correctly:

1. The TableView that the column belongs to must be editable.
2. The TableColumn itself must be editable.

Example:

tableView.setEditable(true);
tableColumnSelected.setCellFactory(CheckBoxTableCell.forTableColumn(tableColumnSelected));
tableColumnSelected.setEditable(true);

As for whether which entry you want to be removed with the delete button, you just need to remove the correct items from the TableView .