Unfolding Menu Animation

Introduction

Today I am going to be creating a cool unfolding menu animation. Two panels swing forward to reveal a submenu for the links in the menu. This uses the CSS3 transform: Rotate and perspective. There is no jQuery in this snippet so it’s a CSS only demo. The two panels are separate so you have to add the links to 2 different containers. The expansion animation pushes the other menu items down giving it a smooth look. Heres a breakdown of the code.

HTML

This is the HTML structure of the menu. Each link consists of a wrapper div with the tag link. Inside this is the menu link title and the 2 panels. Each panel can hold the links of the submenu.

<div class="navbar">
  <a class="menu" href="#">MENU</a>

  <div class="link large" href="#">
    <span class="active"><i class="icon-twitter"></i>Twitter</span>
    <ul class="hover-bot">
      <a href="">Reply</a> 
      <a href="">Favorite</a>
    </ul>
    <ul class="hover-top">
      <a href="">Follow</a> 
      <a href="">Retweet</a>
    </ul>
  </div>
  <div class="link" href="#">
    <span class="active"><i class="icon-facebook"></i>Facebook</span>
    <ul class="hover-bot">
      <a href="">Comment</a> 
    </ul>
    <ul class="hover-top">
      <a href="">Like</a> 
    </ul>
  </div>
  <div class="link" href="#">
    <span class="active"><i class="icon-google-plus"></i>Google Plus</span>
    <ul class="hover-bot">
      <a href="">Share</a> 
    </ul>
    <ul class="hover-top">
      <a href="">Add to Circle</a> 
    </ul>
  </div>

  <div class="end"></div>
</div>

CSS

Here is the styles for the menu. The main part of the animation is the hover part for each UL tags hover-bot and hover-top. Using the RotateX CSS3 Transform it rotates the panels in the Z direction and swings them forward until they’re flat.

.navbar {
  position: fixed;
  left: 0;
  width: 200px;
  height: 100%;

  -webkit-box-shadow: 1px 0 1px 0 rgba(0,0,0,.1);
  box-shadow: 1px 0 1px 0 rgba(0,0,0,.1);

  background-color: #666;
}
  .navbar i { margin-right: 10px; }
  .navbar a.menu {
    display: block;
    margin: 0;
    width: 100%;
    height: 50px;
    color: #444;
    background-color: #fff;
    font-size: 23px;
    line-height: 50px;
  }
  .navbar .link {
    position: relative;
    display: block;
    margin: 0;
    width: 100%;
    height: 50px;
    z-index: 1;

    perspective: 100px;
    -webkit-perspective: 100px; /* Safari and Chrome */

    transition: .23s; 
    -webkit-transition: .23s;   
  }
    .navbar .link:hover { height: 150px; }
      .navbar .link.large:hover { height: 230px; }

    .navbar .link a { 
      display: block;
      color: #999; 
      text-align: left;
      padding-left: 20px;

      transition: .3s; 
      -webkit-transition: .3s;   
    }
      .navbar .link a:hover {     
        color: #666;
        padding-left: 30px;
      } 

    .navbar .link span.active,
    .navbar .link .hover-top,
    .navbar .link .hover-bot {     
      display: block;
      position: absolute;
      width: 100%;
      height: 50px;
      line-height: 50px;
      left: 0;
      top: 0;
      color: #777;
      font-size: 12px;

      transition: .23s; 
      -webkit-transition: .23s;   
    }

      /* Larger foldout size */
      .navbar .link.large .hover-top,
      .navbar .link.large .hover-bot {
        line-height: 45px;
        height: 90px;
      }
      .navbar .link.large:hover .hover-bot {
        transform: translateY(140px) rotateX( 0deg );
        -webkit-transform: translateY(140px) rotateX( 0deg );
        background-color: #f0f0f0;
      }

    .navbar .link span.active { 
      top: 0;     
      left: 0;
      background-color: #fff;
      color: #aaa;
      font-size: 13px;
      border-top: 1px solid rgba(0,0,0,.1);
    }

    .navbar .link .hover-top {
      top: 50px;
      transform-origin: 0% 0% 0px;
      -webkit-transform-origin: 0% 0% 0px;

      transform: rotateX( -90deg );
      -webkit-transform: rotateX( -90deg );
      z-index: -1;

      background-color: #fff;
    }
      .navbar .link:hover .hover-top {
        transform: rotateX( 0deg );
        -webkit-transform: rotateX( 0deg );
        background-color: #f0f0f0;
    }
    .navbar .link .hover-bot {
      transform-origin: 0% 100% 0px;
      -webkit-transform-origin: 0% 100% 0px;

      transform: rotateX( 130deg );
      -webkit-transform: rotateX( 130deg );
      z-index: -1;

      background-color: #888;
    }
      .navbar .link:hover .hover-bot {
        transform: translateY(100px) rotateX( 0deg );
        -webkit-transform: translateY(100px) rotateX( 0deg );
        background-color: #f0f0f0;
      }
    
    .navbar .end {
      position: relative;
      z-index: 1;
      width: 100%;
      height: 100%;
      background-color: #fff;
      border-top: 1px solid rgba(0,0,0,.1);
    }

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