JavaFX: Bidirectional Binding in FXML

Question

I'm working with JavaFX, and am investigating data binding. I've found that I can define a one-way binding in my FXML, like this:

<TextField fx:id="usernameTextField" text="${controller.userName}" GridPane.columnIndex="1" />

This means, that the text of the usernameTextField is 'observing' the controller.userName property.

But this creates a one-way binding. If the controller.userName property changes, I see the updated text in the text field, that part works. But I can no longer insert text into the text field, because I've made the one-way binding.

All I can find about this are posts which are now more than four years old, but I can't figure out, if JavaFX has been updated to support more elaborate bindings.

Answer 1

The way to do that is:

<TextField fx:id="usernameTextField" text="#{controller.userName}"/>

But this feature is not enabled yet (last checked on OpenJFX 13) and using it will cause FXMLLoader to throw an UnsupportedOperationException("This feature is not currently enabled.").