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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap.min.css">
  <link rel="stylesheet" href="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/css/bootstrap-theme.min.css">
  <style>
  body{
  padding-top: 70px;
}
  </style>
</head>
<body>
<div class="navbar navbar-default navbar-fixed-top" role="navigation">
  <div class="container">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target=".navbar-collapse">
        <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="#">Bootstrap theme</a>
    </div>
    <div class="navbar-collapse collapse">
      <ul class="nav navbar-nav">
        <li class="dropdown">
          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
          <ul class="dropdown-menu" role="menu">
            <li><a href="#first">first</a></li>
            <li><a href="#end">end</a></li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</div>
<ul>
  <li id="first">first</li>
  <li>a2</li><li>a3</li><li>a4</li><li>a5</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li>
  <li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li><li>a</li>
  <li id="end">end</li>
</ul>  
​
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
  <script>
    var navHeight = $('.navbar-collapse').height();
​
$('.navbar-collapse').on('show.bs.collapse', function(){
  
  if($(this).height() != 0){
     navHeight = $(this).height();
  }
  
  $('body').animate({
    'padding-top': parseInt($("body").css("padding-top")) + navHeight
   }, 300);
  
});
​
$('.navbar-collapse').on('hide.bs.collapse', function(){
  
  navHeight = $(this).height();
  
  $('body').animate({
    'padding-top': parseInt($("body").css("padding-top")) - navHeight
   }, 300);
  
});
  </script>
</body>
</html>
Output

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