Re: Validation in valueChangeListener

[Joerg Bredlau]

Hi,

On Wed, 12 Apr 2006, Volker Weber wrote:

[...]

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

here you need: FacesContext.getCurrentInstance().renderResponse();



I've tried out this hint, but the model always updated when the field is 
empty. The message displayed in the global messages-tag
instead the associated message-tag.

Is it possible to save the state of the diplayed page with saveState() and 
when validation fails to restore it? Or is this approach oversized for this task?



Thanks
Joerg