{% url 'verified-email-field:send' fieldsetup_id as send_url %} 
<div class="input-group">
{% for subwidget in widget.subwidgets %}
    {% include subwidget.template_name with widget=subwidget %}
{% endfor %}
    <span class="input-group-btn">
        <button class="btn btn-default" type="button" 
            onclick="send_verification_code('{{name}}', '{{send_url}}')">
            {{send_label}}
        </button>
    </span>
</div>