JAVAFX ComboBox is blank

Question

I am very new to programming and can't seem to get past this hiccup. I would like to have a choicebox that is populated with options and that is present immediately. I have tried defining the ObservableList and then creating a ComboBox but it is empty when I actually run the code. I do not need to edit this array after it appears. Here is my code:

ObservableList<String> options = 
FXCollections.observableArrayList(
    "Option 1",
    "Option 2",
    "Option 3"
);

@FXML
final ComboBox stores = new ComboBox(options);

@FXML
private Label label;

I have created the combobox in the FXML document using Scene Builder with FXid stores.

Any help would be appreciated! Thanks in advance.

score 1 · Accepted Answer · answered Sep 22 '16 at 00:52

1

when you decorate your javafx component with anotation, you should not initiate it. Only this is ok;

 @FXML ComboBox stores;

in the initialize method in your controller class. add this code:

stores.setItems(options);

answered Sep 22 '16 at 00:52

kamel2005

459
3
13

score 0 · Answer 2 · edited May 23 '17 at 10:27

-->Your code should be like this:

 ObservableList<String> options = 
    FXCollections.observableArrayList(
        "Option 1",
        "Option 2",
        "Option 3"
    );

    @FXML
    final ComboBox stores ;

    @FXML
    private Label label;

Don't try to initialize fxml components,the FXMLLoader will do this for you.You have first to call the FXMLLoader so the nodes are initialized and then here are two different solutions based on your implementation:

Solution 1(Your class implements Initializable(for example))

/**
 * Called after the FXML layout is loaded.
 */
@Override
public void initialize(URL url, ResourceBundle rb) {

    //Add the ObservableList to the ComboBox
    stores.setItems(options); 

}

Solution 2(Add the method initialize() in your fxml controller,when this method is called then you know that your fxml components have been initialized)

/**
 * Called after the FXML layout is loaded.
 */
 @FXML
 public void initialize(){

    //Add the ObservableList to the ComboBox
    stores.setItems(options); 

 }

JAVAFX ComboBox is blank

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