I try to validate input from a TextField, onKeyEvent

Question

When press ENTER a method is executed, and if not show a dialog message to user if no value in the field. Thinking also to do a validation over the input of the user. I've tried this but every time a key is pressed the message dialog pops up.

protected void onTextFieldKeyEnter(KeyEvent event) {
       if (event.getCode() == KeyCode.ENTER && !textField.getText().equals("")) {
           onHelloButtonClick();
           textField.clear();
           textField.isFocused();
       } else {
           Alert alert = new Alert(Alert.AlertType.WARNING);
           alert.setTitle("Atentionare");
           alert.setHeaderText("Informatia nu este corecta!");
           alert.setContentText("Campul nu poate sa fie gol. Introduceti un cif valid");
           alert.showAndWait();
       }
   }

Answer 1

Your else is executed every time an input was made except of ENTER. So you should change to else if (event.getCode() == KeyCode.ENTER) or move your validation like

if (event.getCode() == KeyCode.ENTER) {
    if (!textField.getText().equals("")) {
        onHelloButtonClick();
        textField.clear();
        textField.isFocused();
    } else {
        Alert alert = new Alert(Alert.AlertType.WARNING);
        alert.setTitle("Atentionare");
        alert.setHeaderText("Informatia nu este corecta!");
        alert.setContentText("Campul nu poate sa fie gol. Introduceti un cif valid");
        alert.showAndWait();
    }
}