Install

1. Bootstrap dropdown.js   Created by Twitter, Inc.

CDN

<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script>

npm

$ npm install  jquery-drawer  jquery@2.2.4  iscroll  bootstrap@3.3.7

If you use to Browserify

IScroll = require('iscroll');
var $ = jQuery = require('jquery');
var drawer = require('jquery-drawer');
var dropdown = require('bootstrap/js/dropdown.js'); // bootstrap v3.3.7
// var dropdown = require('bootstrap/dist/js/umd/dropdown.js'); // bootstrap v4.0.0-alpha

Markup

<ul class="drawer-menu">
  <li><a class="drawer-menu-item" href="#">Left</a></li>
  <li class="drawer-dropdown">
    <a class="drawer-menu-item" href="#" data-toggle="dropdown" role="button" aria-expanded="false">
      Navbar <span class="drawer-caret"></span>
    </a>
    <ul class="drawer-dropdown-menu">
      <li><a class="drawer-dropdown-menu-item" href="#">Dropdown nav1</a></li>
      <li><a class="drawer-dropdown-menu-item" href="#">Dropdown nav2</a></li>
      <li><a class="drawer-dropdown-menu-item" href="#">Dropdown nav3</a></li>
    </ul>
  </li>
</ul>