Basic JavaFX TableView of Single String Column

Question

I am trying to create an incredibly simple JavaFX TableView: 1 column of Strings. I have an Array which I would like to visualize:

String[] acronyms = {"Foo", "Bar"};

The documentation presumes some datatype to fill multiple columns (e.g. Person, Book, etc.). I am going much more "hello world" than that: just displaying an Array of Strings.

Using scene builder I created an fxml file with the table & column:

<TableView fx:id="clientAcronymTable" prefHeight="200.0" prefWidth="200.0">
 <columns>
  <TableColumn fx:id="clientAcronymColumn" prefWidth="199.0" text="Client Acronyms" />
 </columns>
  <columnResizePolicy>
     <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
  </columnResizePolicy>
</TableView>

I then "wire" these elements inside of my controller:

@FXML private TableView<String> clientAcronymTable;

@FXML private TableColumn<ObservableList<String>, String> clientAcronymColumn;

And inside my Initializable::initialize method I have:

clientAcronymTable.setItems(FXCollections.observableList(acronyms));

However, none of the Strings appear in the GUI. I know something is happening because there are visible row lines displayed in the column, but they're all empty.

There are of course similar questions which don't really apply:

So, my questions are:

How do I make the Strings in my Array visible inside of the TableView?

How do I make the single column editable so the user can add more Strings?

Thank you in advance for your consideration and response.

you should use cellvaluefactory for this

Evgeniy Strepetov
– Evgeniy Strepetov

2016-01-02 20:44:17 +00:00
Commented Jan 2, 2016 at 20:44 — Evgeniy Strepetov
– Evgeniy Strepetov, Commented Jan 2, 2016 at 20:44

James_D · Accepted Answer · 2016-01-02 20:58:27Z

5

First, you have the wrong type for your TableColumn. Since each row contains a String (not an ObservableList<String>), you need

@FXML private TableColumn<String, String> clientAcronymColumn;

And then you need a cellValueFactory, which tells each cell in the column how to get the value it displays from the row:

clientAcronymColumn.setCellValueFactory(cellData -> 
    new ReadOnlyStringWrapper(cellData.getValue()));

As for adding more strings, you would typically have an external text field for the user to provide more:

// you can of course define the text field in FXML if you prefer...
TextField newAcronymTextField = new TextField();

newAcronymTextField.setOnAction(e -> {
    clientAcronymTable.getItems().add(newAcronymTextField.getText());
    newAcronymTextField.clear();
});

edited Jan 2, 2016 at 20:58

answered Jan 2, 2016 at 20:48

James_D

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2 Comments

Ramón J Romero y Vigil Over a year ago

Do you know what the type of cellData is?

James_D Over a year ago

cellData is aTableColumn.CellDataFeatures<String, String>

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