Getting Started

Simply create a textfield, and make each GUI class implement ValidationCandidate:

  //your Dialogs must implement this interface
  public class ExampleGUI implements ValidationCandidate {

     public void begin(Stage primaryStage) {
        VBox vBox = new VBox();

        //create a textfield
        TextField textField = new TextField();

        //validate it
        SimpleValidatorDecorator simpleValidatorDecorator = new SimpleValidatorDecorator(this);
        SimpleValidator validator = new TextFieldValidator(textField, simpleValidatorDecorator);
        validator.add(new MinimumFieldLengthValidator(5)); //add the various validations, as needed
        validator.add(new MaximumFieldLengthValidator(12));
        simpleValidatorDecorator.addValidator(validator);
        //that's all!

        vBox.getChildren().addAll(textField);
        Scene newScene = new Scene(vBox);
        newScene.getStylesheets().add("/css/stylesheet.css");
        primaryStage.setScene(newScene);
        primaryStage.show();
     }

     @Override
     public void allGUIFieldsAreValid() {
         System.out.println("All text boxes are valid."); 
        //SimpleValidation will call this method when *all* the added textfields validate
     }
 }

A full working example is included with the source code, which I would urge you to examine. SimpleValidator is mostly self-contained, but you will need to add Log4J to your projects dependencies. If you use Maven, a sample POM is added to the program sourcecode for ease of use. Otherwise please download Log4j and add it to your programs' libraries.