how do I create a textfield which supports numbers only in vaadin

Question

I am using a Vaadin text field and I want to restrict it to support numbers only in it. I tried to override setValue() and return without calling super. setValue() if text is not a number. But it doesn't seems to be working. How can I correct this? I am using Vaadin 7. And I think it doesn't support NumberField as well.

Answer 1

In Vaadin 7, you can use a TextField and set a validator to allow only numbers:

TextField textField;
textField.addValidator(new RegexpValidator("[-]?[0-9]*\\.?,?[0-9]+"), "This is not a number!");

Change the regex to fit your needs. Remember that still is handling Strings and therefore you still need to convert the returning value of the TextField:

Long.parseLong(textField.getValue())

Answer 2

With Vaadin 8, you can use Binder:

Binder<YouBean> binder = new Binder<>();
binder.forField(textField)
      .withConverter(new StringToIntegerConverter("Must be Integer"))
      .bind(YouBean::getter, YouBean::setter);
binder.setBean(bean);  //optional