I'm trying to validate a javafx form using ValidationSupport, the validation is working, but when I access the form the "errors decorations" are already shown, even before the form is submitted or the textfield is focused.
ValidationSupport validationSupport = new ValidationSupport(); validationSupport.registerValidator(textField, Validator.createEmptyValidator("Text is required"));
The following image shows an example of the form in its initial state.
How can I force the decoration to show only after the user submit the form or change the TextField value?
To validate controls on demand is an issue (on-demand validation option) on ControlsFx's issue tracker which is still open so ControlsFx does NOT support it yet.
But there is a way to suppress error decorations:
ValidationSupport validationSupport = new ValidationSupport(); validationSupport.setErrorDecorationEnabled(false);
Later, when you actually want to validate (on submit button for example) you need to reset it to default value:
validationSupport.setErrorDecorationEnabled(true); validationSupport.redecorate();
This way, fields still get validated by every change but error decorations are not shown until you actually want them to be shown.
Example:
In this example we'd like to see validation errors only if number field has the focus.
public class Sandbox extends Application { @Override public void start(Stage primaryStage) throws Exception { GridPane pane = new GridPane(); pane.add(new Label("Number field:"), 0 , 0); TextField numberField = new TextField(""); pane.add(numberField, 1, 0); TextField textField = new TextField(""); pane.add(new Label("Text field:"), 0, 1); pane.add(textField, 1, 1); ValidationSupport vs = new ValidationSupport(); vs.setErrorDecorationEnabled(false); // we don't want errors to bother us for now. vs.registerValidator(numberField, Validator.createRegexValidator("must be digits only!", "\\d*", Severity.ERROR)); // validate and show errors only if number field has the focus vs.errorDecorationEnabledProperty().bind(numberField.focusedProperty()); primaryStage.setScene(new Scene(pane)); primaryStage.show(); } public static void main(String[] args) { Application.launch(Sandbox.class); } }
or if you want to see validation errors only after submit button is clicked for the first time:
... Button button = new Button("Submit"); pane.add(button, 0, 2); ValidationSupport vs = new ValidationSupport(); vs.setErrorDecorationEnabled(false); // we don't want errors to bother us for now. vs.registerValidator(numberField, Validator.createRegexValidator("must be digits only!", "\\d*", Severity.ERROR)); button.setOnAction(new EventHandler<ActionEvent>() { @Override public void handle(ActionEvent event) { vs.setErrorDecorationEnabled(true); // validate and show errors now! } }); ...
