JavaFx: Bidirectional Binding, selected value in TableView

Question

I need some help, im trying to bind properties of an object in my model with some labels and textfields.

label1.textProperty().bind(myModel.getSelectedObject().getNameProperty());

in this case getSelectedObject() is the selected Object in a TableView. Somehow this doesn't work as expected. When the model's value changes, the label doesn't change.

I mangaged to fix this issue with the Bindings help class:

label1.textProperty().bind(Bindings.select(myModel.getSelectedObject(), "name"));

Only with the Bindings help class the label's text gets binded correctly to the name-property of the object.

now im trying to get the same result with a bidirectional binding. Anyone any ideas?

If i bind it like this, it has no effect (same as first code-snipped)

textField.textProperty().bindBidirectional(myModel.getSelectedObject().getNameProperty());

Answer 1

ChangeListener for SelectionModel enable to switch binding. Try it out.

tableView.getSelectionModel().selectedItemProperty().addListener((o, ov, nv) -> {
    if (ov != null) textField.textProperty().unbindBidirectional(ov.nameProperty());
    if (nv != null) {
        textField.setDisable(false);
        textField.textProperty().bindBidirectional(nv.nameProperty());
    } else {
        textField.setDisable(true);
        textField.setText("");
    }
});

NOTE:

In case selected item is removed from TableView's items, This ChangeListner is called with removed item as oldValue rather than null. So no needs to care removal of list item .