Material Design风格侧边栏菜单变形效果

这是一款使用CSS3和少量jQuery代码来制作的Material Design风格侧边栏菜单变形效果。该侧边栏菜单开始时是一个汉堡包按钮，当用户点击该按钮之后，按钮会变形展开为右侧固定的侧边栏菜单。

使用方法

HTML结构

该侧边栏菜单的HTML结构如下：

<div class="menu-expanded">
  <div id="menu" class="menu"></div>
  <span class="linee linea1"></span>
  <span class="linee linea2"></span>
  <span class="linee linea3"></span>
  <div class="main-menu">
    <ul>
      <li><a href="#">Home</a></li>
      <li><a href="#">Categories</a></li>
      <li><a href="#">Works</a></li>
      <li><a href="#"><a href="#">Portfolio</a></a></li>
      <li><a href="#">Contact Us</a></li>
      <li><a href="#">About Us</a></li>
    </ul>
  </div>
</div>                 
                

CSS样式

侧边栏菜单的样式如下：

.menu-expanded {
  background-color: transparent;
  position: fixed;
  width: 340px;
  height:100%;
  top: 0px;
  right: 0px;
  overflow: hidden !important;
  z-index: 5;
}

.menu {
  float: right;
  margin: 15px 15px 0 0;
  height: 49px;
  width: 49px;
  border-radius: 50%;
  background-color: #EE283D;
  border: none;
  transition: all 0.40s ease-out;
}

.main-menu {
  visibility: hidden;
  position: absolute;
  right: 50px;
  top: 160px;
  opacity: 0;
  transition: all 0.300s;
  transition-delay: 0s;
}

.main-menu ul {
  list-style-type: none;
}

.main-menu ul li {
  margin: 20px 0px;
}

.main-menu ul li a {
  float: right;
  text-decoration: none;
  color: transparent;
  background-color: #DB0024;
  margin-top: 20px;
}

.main-menu ul li a:hover {
  opacity: 0.7;
}
                

汉堡包按钮的主要样式如下：

.menu,
.linee {
  cursor: pointer;
}

.over {
  transform: scale(100);
  transition: all 0.350s ease-in;
  cursor: default;
}

.linea1 {
  background: #fff;
  height: 2px;
  width: 15px;
  position: absolute;
  right: 33px;
  top: 33px;
  transition: all 0.3s;
}

.linea2 {
  background: #fff;
  height: 2px;
  width: 15px;
  position: absolute;
  right: 33px;
  top: 38px;
  opacity: 1;
  transition: opacity 0.5s;
}

.linea3 {
  background: #fff;
  height: 2px;
  width: 15px;
  position: absolute;
  right: 33px;
  top: 43px;
}

.overL1 {
  animation: closetop 1s forwards;
  animation-direction: alternate;
  cursor: pointer;
}

.overL2 {
  opacity: 0;
  transition: opacity 0.5s;
  cursor: pointer;
}

.overL3 {
  animation: closebottom 1s forwards;
  animation-direction: alternate;
  cursor: pointer;
}                  
                

汉堡包按钮变形为侧边栏菜单的CSS代码如下：

@keyframes closetop {
  0% {
    transform: translateY(5px) rotate(0deg);
  }
  25% {
    transform: translateY(5px) rotate(0deg);
  }
  75% {
    transform: translateY(5px) rotate(-45deg);
  }
  100% {
    transform: translateY(5px) rotate(-45deg);
  }
}

@keyframes closebottom {
  0% {
    transform: translateY(0px) rotate(0deg);
  }
  25% {
    transform: translateY(-5px) rotate(0deg);
  }
  75% {
    transform: translateY(-5px) rotate(45deg);
  }
  100% {
    transform: translateY(-5px) rotate(45deg);
  }
}

.overmain {
  visibility: visible;
  opacity: 1;
  transition: all 0.400s;
  transition-delay: 0.370s;
}                  
                

JavaScript

该特效使用jQuery代码来为按钮点击时切换相应元素的class。

$('.menu , .linee').on('click', function() {
  $('.menu').toggleClass('over')
  $('.linea1').toggleClass('overL1')
  $('.linea2').toggleClass('overL2')
  $('.linea3').toggleClass('overL3')
  $('.main-menu').toggleClass('overmain')
});