JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/js/bootstrap-select.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.12.4/css/bootstrap-select.min.css">
<select class="selectpicker" id="countrycode">
  <option data-countryCode="IN" value="91" title="+91">India (+91)</option>
  <option data-countryCode="US" value="1" title="+1">USA (+1)</option>
  <option data-countryCode="DZ" value="213" title="+213">Algeria (+213)</option>
  <option data-countryCode="AD" value="376"  title="+376">Andorra (+376)</option>
</select>
Selected value: 
<span id='selectedCountry'></span>

JavaScript

$(document).ready(function(){
	$('#selectedCountry').html($(this).val());
	$('#countrycode').on('change',function(){
  	//$('#selectedCountry').html($(this).val());
  });
});