Using SceneBuilder to Create a User Interface - JavaFX 8: A Definitive Guide to Building Desktop, Mobile, and Embedded Java Clients - page 121

public void setProdId(String prodId) {
this.prodId.set(prodId);
}
The validation requirement and the convenience functionality are in the initialize() method, which will
be called by the FXMLLoader when it has finished loading the FXML file. We hooked up ChangeListener s to the
textProperty of the two TextField s, and allow only valid changes to occur. We also move the cursor to prodCode
when the prefix is filled with the correct data. Likewise, when we back off from the prodCode field, the cursor will
naturally jump to the prefix text field.
@FXML
public void initialize() {
prefix.textProperty().addListener((observable, oldValue, newValue) -> {
switch (newValue) {
case "A":
case "B":
case "C":
prodCode.requestFocus();
break;
default:
prefix.setText("");
}
});
prodCode.textProperty().addListener((observable, oldValue, newValue) -> {
if (newValue.length() > 6) {
prodCode.setText(newValue.substring(0, 6));
} else if (newValue.length() == 0) {
prefix.requestFocus();
}
});
prodId.bind(prefix.textProperty().concat("-").concat(prodCode.textProperty()));
}
When the CustomComponent program is run, the Custom Component Example window shown in Figure 3-8
is displayed.
Figure 3-8. The CustomComponent program