Naneu did something very nice as I think
(http://naneau.nl/playground/formvalidate/)...
This should be the right way (as many others already said) - simply support
nothing for javascript.
It's enough to make the Zend_Form JSON compatible.
For example:

validateJSONAction() {
        $form = new Zend_Form(); // ...
        $form->populateFromJson($this->getRequest()->getParam('formvalues');
// send via Ajax from the form
        if($form->isValid()) {
              // isValid json string
        } else {
              // display erros as json
        }
}

Than simply Js has to put the errors in a <div> or submit the form if there
aren't any errors.
If we build the ZF on other libraries, I think the idependence for every
developer will be lost.
Maybe later, we could write some adapter/viewhelper, which (dependent on the
library) build an formobserver which creates the Ajax request.
The rest should be done by each developer, not by ZF!

Best regards
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