How to modify your single email widget to allow previewing new form code -- https://your-site.desk.com/customer/widget/emails/new?ticket[labels_new]=preview

gistfile1.html

{% if ticket.labels_new == "preview" %}
This is where your new form's code would go.
{% else %}
<div class="customer_widget" id="customer_widget_main">
  <div class="inside_title" style="font-size:25px"><img src=
  "http://www.ebookconversion.biz/images/coffeecup_logo_banner_b.jpg"></div>

  <div class="inside_desc">
    CONTACT BOOKNOOK.BIZ NOW!
  </div>

  <div class="customer_inner_widget">
    {% if current_user.is_guest %}

    <div class="input">
      <span class="form_label">First name:</span> <input class="default l" id=
      "customer_first_name" name="customer[first_name]" type="text">
    </div>

    <div class="input">
      <span class="form_label">Last name:</span><br>
      <input class="default l" id="customer_last_name" name=
      "customer[last_name]" type="text">
    </div>

    <div class="input">
      <span class="form_label">Your email address:</span> {{ interaction_email
      }}
    </div>{% endif %}

    <div class="input">
      <span class="form_label">Subject:</span> {{ email_subject }}
    </div>

    <div class="input">
      <span class="form_label">Tell us what you need:</span> {{ email_body }}
    </div>

    <div class="input">
      <span class="form_label">Book Title:</span> {{ ticket_custom_book_title
      }}
    </div>

    <div class='input'>
      <span class='form_label'>File Attachment - one file only (under 20MB in
      size). If you need to send more than one file, tell us in your message
      and we'll send you a link for multiple file upload:</span> {{
      file_attachment }}
    </div>{{hidden_parameters }} {{ submit_button }} {{ interaction_info }}
  </div><!--customer_inner_widget-->
</div><!--customer_widget_main-->
{% endif %}