how to control Javafx Textfield input so it wont accept space

Question

I made a textfield in JavaFX of username, I want to run a method that checks if there is a space or not! , is there a way to do that ?

Answer 1

TextFormatter's filter

This filter(UnaryOperator) allows a user to intercept and modify any change done to the text content. Here is an example which sets no change on space value.

TextField field = new TextField();

field.setTextFormatter(new TextFormatter<>(change -> {
    if (change.getText().equals(" ")) {
        change.setText("");
    }
    return change;
}));