trick : re-populate forms if submission fail..

nothing complex.. you need J-query and this populate pluggin: https://github.com/dtuite/jquery.populate

in your controller save action, save forms datas into session (before redirect):

        $this->session->set('currentForm', $_POST);

in your volt file, add:

    <script>
        var formDatas = {};
    </script>
    {% if session.get('currentForm') !== null %}
        <script>
            formDatas = {{ session.get('currentForm')|json_encode }};
        </script>
    {% endif %}
    <?php unset($_SESSION['currentForm']); ?>  //not found how to do that with volt languages...

then in your js file:

    if (formDatas !== undefined  &&  formDatas !==  "")  {
        $("#your-form").populate(formDatas, {resetForm:true});
    }

that all folkz.. don't forget to remove password from $_POST if any, or they will be displayed clear in the htm source..