18F/calc

<form enctype="multipart/form-data" method="post"

      {# The line below is VERY important, as it tells the browser #}
      {# to progressively enhance the form into an ajax form. #}

      is="ajax-form"

      action="{% url 'styleguide:ajaxform' %}">
  {% csrf_token %}
  {% load frontend %}

  {% if request.is_ajax %}
  {% include 'data_capture/messages.html' %}
  {% endif %}

  {% with form=ajaxform_form %}
    {{ form.non_field_errors }}
    {% fieldset form.question %}
    {% fieldset form.some_checkboxes %}
    {% fieldset form.some_radios %}
    {% fieldset form.on_valid_submit %}
    {{ form.file.errors }}
    {{ form.file }}
  {% endwith %}

  <button type="submit" class="usa-button usa-button-primary" style="display: inline-block">Submit</button>

  <button type="submit" class="usa-button usa-button-secondary" name="cancel" formnovalidate style="display: inline-block">Cancel</button>
</form>