Bootstrap Tutorial - Handle submenu click event

The following code shows how to handle submenu click event.
Example

<!--<!--from   w  ww. ja va  2s. c o m-->
Code revised from
http://fiddle.jshell.net/2nBm9/
-->
<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'
  src='http://code.jquery.com/jquery-git2.js'></script>
<link rel="stylesheet" type="text/css"
  href="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/css/bootstrap.min.css">
<script type='text/javascript'
  src="http://netdna.bootstrapcdn.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
<style type='text/css'>
.btn-input {
  display: block;
}

.btn-input .btn.form-control {
  text-align: left;
}

.btn-input .btn.form-control span:first-child {
  left: 10px;
  overflow: hidden;
  position: absolute;
  right: 25px;
}

.btn-input .btn.form-control .caret {
  margin-top: -1px;
  position: absolute;
  right: 10px;
  top: 50%;
}
/* dropdown submenu bootstrap 3 fix */
.dropdown-submenu {
  position: relative;
}

.dropdown-submenu>.dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -6px;
  margin-left: -1px;
  -webkit-border-radius: 0 6px 6px 6px;
  -moz-border-radius: 0 6px 6px 6px;
  border-radius: 0 6px 6px 6px;
}

.dropdown-submenu:hover>.dropdown-menu {
  display: block;
}

.dropdown-submenu>a:after {
  display: block;
  content: " ";
  float: right;
  width: 0;
  height: 0;
  border-color: transparent;
  border-style: solid;
  border-width: 5px 0 5px 5px;
  border-left-color: #cccccc;
  margin-top: 5px;
  margin-right: -10px;
}

.dropdown-submenu:hover>a:after {
  border-left-color: #ffffff;
}

.dropdown-submenu.pull-left {
  float: none;
}

.dropdown-submenu.pull-left>.dropdown-menu {
  left: -100%;
  margin-left: 10px;
  -webkit-border-radius: 6px 0 6px 6px;
  -moz-border-radius: 6px 0 6px 6px;
  border-radius: 6px 0 6px 6px;
}
</style>
<script type='text/javascript'>//<![CDATA[ 
$(window).load(function(){
   $(document.body).on('click', '.dropdown-menu li', function (event) {
       var $target = $(event.currentTarget);
       if ($target.is('.dropdown-submenu')) return false;
       $target.closest('.btn-group')
           .find('[data-bind="label"]').text($target.text())
           .end()
           .children('.dropdown-toggle').dropdown('toggle');
       return false;
   });
});//]]>  
</script>
</head>
<body style='margin:30px'>

  <div class="panel panel-default">
    <div class="panel-body">
      <div class="btn-group btn-input clearfix">
        <button type="button"
          class="btn btn-default dropdown-toggle form-control"
          data-toggle="dropdown">
          <span data-bind="label">Select One</span>&nbsp;<span
            class="caret"></span>
        </button>
        <ul class="dropdown-menu" role="menu">
          <li><a href="#">Item 1</a></li>
          <li class="dropdown dropdown-submenu"><a href="#">Submenu</a>
            <ul class="dropdown-menu">
              <li><a href="#">SubItem 1</a></li>
              <li><a href="#">SubItem 2</a></li>
            </ul></li>
          <li><a href="#">This is a longer item that will not
              fit properly</a></li>
        </ul>
      </div>
      <br />
      <h6>Selecting "Submenu" replaces the button with parent
        text and submenu text</h6>
    </div>
  </div>
</body>
</html>
Click to view the demo