Re: Validation in valueChangeListener

[Joerg Bredlau]

Sorry for double posting. I thought my mailprovider would have a
problem ...


On Wed, 12 Apr 2006, Joerg Bredlau wrote:

Hello,

I'm working on validation for my InputComponents. For each of the components I want individual messages if the field is empty.

I know, thats impossible with the standard required-Validator.
I tried out OptionalValidatorFramwork, but it doesn't work for me.

Now I want to make the validation by hand in valueChangeListeners, added to the components. My Problem is: The ValueChangeListener is executed before model_update,thats right? How can I get back to ValidationPhase(?) when the field is empty, to display the input-page again and not update my model?

Here is the codefragment I'm working on:

public void lastnameChange(ValueChangeEvent event) {
   String lastname = ((String) event.getNewValue()).trim();
   String compId = event.getComponent().getId();

   if (( lastname== null) || (lastname.length() == 0)) {
        FacesUtils.addInfoMessage(compId, "Please enter your name.");
       // TODO go back to input page with old value
   }
}



Or is there another approach for validation with individual messages to
empty fields?


Thanks
Joerg