Create a custom field on Contact form in Jumpseller.liquid

<!-- creates a custom select on the Contact page -->

<div id="custom_select_container" class="field col-md-12">
  <label for="contactpage_name" class="required control-label">Custom Field <em>*</em></label><br>
  <select id="custom_select" class="text form-control" required="required" >
  <option value=""></option>
    <option value="1">Option 1</option>
    <option value="2">Option 2</option>
  </select>
</div>

<script>
  $(document).ready(function(){
    $("#custom_select_container").insertBefore("#contactpage_message")
  });
  $('#contact_form').submit(function() { 
 text = document.getElementById("contact_message").value 
 $("#contact_message").val(text + "\nSelected Option: " + $("#custom_select option:selected").text() )
  });
</script>