dropdown menu

prototype

by Seungrae Lee

HTML

<ul class="nav navbar-nav topNav">
  <li class="dropdown">
    <a title="menu3" href="#">
      menu3
    </a>
  </li>
  <li class="dropdown">
    <a title="menu2" href="#">
      menu2
    </a>
  </li>
  <li>
    <a title="menu1" href="#" id="menu1">

      menu1
      <span class="caret"></span>

    </a>
    <ul class="dropdown-menu" id="submenu1">
      <li>
        <a href="#">list1</a>
      </li>
      <li>
        <a href="#">list2</a>
      </li>
    </ul>
  </li>

</ul>

CSS

a {
  background-color: transparent;
  text-decoration: none;
}

.nav {
  padding-left: 0;
  list-style: none;
}

.navbar-nav {
  float: left;
  margin: 0;
}

.navbar-nav > li {
  float: left;
}

.nav > li {
  position: relative;
  display: block;
}

.navbar-nav > li > a {
  color: #777;
  text-shadow: 0px 1px 0px rgba(255, 255, 255, 0.25);
  padding-top: 7.5px;
  padding-bottom: 7.5px;
  line-height: 20px;
}

.topNav > li > a {
  border-right: 1px dotted #aaa;
  letter-spacing: -1.2px;
}

.nav > li > a {
  padding-left: 6px;
  padding-right: 6px;
  position: relative;
  display: block;
}

.caret {
  display: inline-block;
  width: 0px;
  height: 0px;
  margin-left: 2px;
  vertical-align: middle;
  border-top: 4px solid;
  border-right: 4px solid transparent;
  border-left: 4px solid transparent;
}

.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  z-index: 1000;
  display: none;
  float: left;
  min-width: 160px;
  padding: 5px 0;
  margin: 2px 0 0;
  font-size: 14px;
  text-align: left;
  list-style: none;
  background-color: #fff;
  -webkit-background-clip: padding-box;
          background-clip: padding-box;
  border: 1px solid #ccc;
  border: 1px solid rgba(0, 0, 0, 0.15);
  border-radius: 4px;
  -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
          box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
}

.dropdown-menu > li > a {
  display: block;
  padding: 3px 20px;
  clear: both;
  font-weight: normal;
  line-height: 1.43;
  color: #333;
  white-space: nowrap;
}
.dropdown-menu > li > a:hover,
.dropdown-menu > li > a:focus {
  color: white;
  text-decoration: none;
  background-color: #0081C2;
}

JavaScript

$('menu1').observe('click', function() {
  var visible = $('submenu1').getStyle('display');
  if (visible == 'none') {
    $('submenu1').setStyle({
      display: 'block'
    });
  } else {
    $('submenu1').setStyle({
      display: 'none'
    });
  }
});
$('menu1').observe('blur', function(e) {
  if (e.relatedTarget === null) {
    $('submenu1').setStyle({
      display: 'none'
    });
  }
});