select2.js multiple

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.min.js"></script>
<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/select2/3.2/select2.css">
<select class="xainner xavtext bind xainnerselect select2-hidden-accessible" id="domainname-inner" 
style="width: 200px;" 
data-placeholder="Select Domain Name" data-allow-clear="true">
  <option value="">&lt;Not Applicable&gt;</option>
  <option value="208064">DEVELOPMENT</option>
  <option value="208085">domainb</option>
</select>

JavaScript

$("#domainname-inner").select2();