JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap-theme.min.css&quot;"></script>
<div class="btn-group">
  <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown" aria-expanded="false">
    Power On/Off <span class="caret"></span>
 </button>
  <ul class="dropdown-menu" role="menu">
    <li><a href="#">Power On</a></li>
	
    <li><a href="#">Low Power</a></li>
	
    <li class="divider"></li>
    <li><a href="#">Power Off</a></li>
	
  </ul>
</div>

JavaScript

$(function(){       <!-- change text in power button -->

     $(".dropdown-menu").on('click', 'li a', function(){
     $(".btn:first-child").text($(this).text());
     $(".btn:first-child").val($(this).text());
	 
  });

});