How to override date validation client side

Vaadin 6 / 7 / 8 Framework UI
1

I’m new in with vaadin framework I would like to extend the DateField and validate the date enterred by the user in “client side” server is already done

Example : if user write “today” is become “18.05.2015”

Thanks for all your help.

2

In server side it is quite easy to do this kinds of parsing manipulations.
Why you want to do it in browser?

DateField df = new DateField() {

      @Override
      protected Date handleUnparsableDateString(final String dateString)
          throws Converter.ConversionException {
        if("today".equals(dateString)){
          return new Date();
        }
        throw new Converter.ConversionException("UNABLE PARSE DATE");
      }
    };
3

Thank you Vesa for you help, because in my point of view when you put today in a date and is not evaluation right away is not good.

Server side is a double validation in case…