mstaples

$("#form_field").val(new_value);

$.post( '{{ path('form_submit_path') }}',
      $('#form_name').serialize()
);

mstaples

<script>
    function {{ form_name }}Submit() {
        $.post( '{{ path( form_path ) }}',
                $('#form_{{ form_name }}').serialize(),
                function(data){
                    $('#container_{{ form_name }}').empty().append(data);
                }
        );
        return false;
    }