Table Views

Table views are used to present tablular data (data that is grouped into rows and columns). Columns are often sortable and resizeable, and rows are generally selectable.

Like list views, table views are driven by model data provided in a List object. The values in the list (which represent the rows shown by the table) can be of any type, but are most often instances of Dictionary<String, Object>, which the default table view renders are capable of presenting (for example, Map<String, Object> values stored in a JSON list or instances of Java bean classes that can be wrapped in a BeanAdapter).

The following simple example populates a TableView using an array list containing hash maps of string values for each row. The table data represents the final standings of the top ten medal-winning countries in the 2008 Summer Olympics:

The BXML source is as follows. Note that the name attributes of the TableView.Column elements correspond directly to the keys in the hash maps; this is how TableView knows which values to display in each column:

            <Window title="Table Views" maximized="true"
                        <TableView bxml:id="tableView">
                                <TableView.Column name="nation" width="180" headerData="Nation"/>
                                <TableView.Column name="gold" width="60" headerData="Gold"/>
                                <TableView.Column name="silver" width="60" headerData="Silver"/>
                                <TableView.Column name="bronze" width="60" headerData="Bronze"/>
                                <TableView.Column name="total" width="60" headerData="Total"/>

                            <!-- Source: -->
                            <collections:HashMap nation="China" gold="51" silver="21" bronze="28" total="100"/>
                            <collections:HashMap nation="United States" gold="36" silver="38" bronze="36" total="110"/>
                            <collections:HashMap nation="Russia" gold="23" silver="21" bronze="28" total="72"/>
                            <collections:HashMap nation="Great Britain" gold="19" silver="13" bronze="15" total="47"/>
                            <collections:HashMap nation="Germany" gold="16" silver="10" bronze="15" total="41"/>
                            <collections:HashMap nation="Australia" gold="14" silver="15" bronze="17" total="46"/>
                            <collections:HashMap nation="South Korea" gold="13" silver="10" bronze="8" total="31"/>
                            <collections:HashMap nation="Japan" gold="9" silver="6" bronze="11" total="26"/>
                            <collections:HashMap nation="Italy" gold="8" silver="10" bronze="10" total="28"/>
                            <collections:HashMap nation="France" gold="7" silver="16" bronze="17" total="40"/>

                            <TableViewHeader tableView="$tableView"/>

This example doesn't do much. Clicking on the header (an instance of TableViewHeader set as the ScrollPane's columnHeader property) doesn't sort the data as one might expect. Even if it did, the sort would most likely not produce the expected results: the medal counts are represented as strings, and would be sorted alphabetically rather than numerically.

Also, the TableView doesn't fill the available space: the content simply ends at the right edge, which is determined by the width of the columns. Sometimes this is desirable, but many times it is more visually appealing to provide a "filler" that appears when the table is not wide enough to occupy the available space and disappears when it is not needed.

The next example shows how to create such a "filler". It also demonstrates how to populate a TableView with JSON data, which represents the medal counts as numbers and allows a user to properly sort on their values.

There is no associated Java source code for this example.

Next: JSON-based TableView