ValidateAjax = {
    initialize: function(formid, endpoint){
            end_url = endpoint;
            form_id = '#' + formid;

            $(form_id+' input').blur(function(){
                    var formElementID = $(this).attr('id');
            ValidateAjax.doValidate(formElementID);
                    return false;
            });

            $(form_id).submit(function(){
                    $(form_id+' input').each(function(){
                        var formElementID = $(this).attr('id');
                ValidateAjax.doValidate(formElementID);
                    });
            });
    },
    doValidate: function(id){
            var url = end_url;
    var data = $(form_id).serialize();
    $.post(url,data,function(response){
                    $('#'+id+'Error').find('.error').remove();
        if (response[id])
                            $('#'+id+'Error').append(ValidateAjax.getHTML(response[id]));
    },'json'); 
    },
    getHTML: function(errArray){
            var object = '<div class="error">';
            $.each(errArray,function(key,value){
                    object += value;
            });
            object += '</div>';
            return object;
    }
	
$(document).ready(function(){
    //Set watermark on input fields
    $('#username').watermark(watermark_username);
    $('#email').watermark(watermark_email);
    $('#password').watermark(watermark_password);

    // validation
    ValidateAjax.initialize('registrationForm', '/registration/validateform');
	
public function indexAction() {
    $form = new Application_Form_Registration();
    if ($this->_request->isPost()) {
        $formData = $this->_request->getPost();
    // if form is valid, send mail to the user and store user into the database
        if ($form->isValid($formData)) {
            echo 'success';
        $this->registerUser();
        }
        else {
                echo 'failure'; 
        }
    }
    $this->view->form = $form;
}

public function validateformAction(){
    $form = new Application_Form_Registration();
    $form->isValidPartial($_POST);
    $this->_helper->json($form->getMessages());
}