本例中包含两个下拉选择框的动画示例,本例中并未使用select标签。本例中第一个案例也可用于标题、导航栏等位置。

案例一:

html布局

<div class="content">
  <div class="select">
    <p att="select p">所有选项</p>
    <ul att="select ul">
      <li data-value="所有选项" class="selected">所有选项</li>
      <li data-value="html">html</li>
      <li data-value="css">css</li>
      <li data-value="javascript">javascript</li>
      <li data-value="jQuery">jQuery</li>
    </ul>
  </div>
</div>

整体显示样式

<style type="text/css">
  body{
    padding: 0;
    margin: 0;
    background-color: #0099cc;
    color: #333333;
  }
  .content{
    padding-top: 5%;
  }
  .content .select{
    width: 300px;
    height: 40px;
    margin: 0 auto;
    font-family: "Microsoft Yahei";
    font-size: 16px;
    background-color: #ffffff;
    position: relative;
  }
</style>

下拉列表样式及动画

[att~=select]{
padding:;
margin:;
}
.content .select:after{
content: "";
display: block;
width: 10px;
height: 10px;
border-left: 1px #cccccc solid;
border-bottom: 1px #cccccc solid;
position: absolute;
top: 11px;
right: 12px;
-webkit-transform: rotate(-45deg);
-moz-transform: rotate(-45deg);
-ms-transform: rotate(-45deg);
-o-transform: rotate(-45deg);
transform: rotate(-45deg);
-webkit-transition: -webkit-transform .3s ease-in, top .3s ease-in;
-moz-transition: -moz-transform .3s ease-in, top .3s ease-in;
-ms-transition: -ms-transform .3s ease-in, top .3s ease-in;
-o-transition: -o-transform .3s ease-in, top .3s ease-in;
transition: transform .3s ease-in, top .3s ease-in;
}
.content .select p{
padding: 0 15px;
line-height: 40px;
/*设置光标样式:手型*/
cursor: pointer;
}
.content .select ul{
width: 100%;
/*这样设置相当于隐藏了ul,便实现了下拉样式*/
max-height:;
list-style-type: none;
background-color: #ffffff;
overflow-y: auto;
position: absolute;
top: 40px;
left:;
-webkit-transition: max-height .3s ease-in;
-moz-transition: max-height .3s ease-in;
-ms-transition: max-height .3s ease-in;
-o-transition: max-height .3s ease-in;
transition: max-height .3s ease-in;
}
.content .select ul li{
padding: 0 15px;
line-height: 40px;
cursor: pointer;
}
.content .select ul li:hover{
background-color: #e0e0e0;
}
.content .select ul li.selected{
background-color: #3399ff;
color: #ffffff;
}
@-webkit-keyframes slide-down {
0%{
-webkit-transform: scale(1, 0);
-moz-transform: scale(1, 0);
-ms-transform: scale(1, 0);
-o-transform: scale(1, 0);
transform: scale(1, 0);
}
25%{
-webkit-transform: scale(1, 1.2);
-moz-transform: scale(1, 1.2);
-ms-transform: scale(1, 1.2);
-o-transform: scale(1, 1.2);
transform: scale(1, 1.2);
}
50%{
-webkit-transform: scale(1, 0.85);
-moz-transform: scale(1, 0.85);
-ms-transform: scale(1, 0.85);
-o-transform: scale(1, 0.85);
transform: scale(1, 0.85);
}
75%{
-webkit-transform: scale(1, 1.05);
-moz-transform: scale(1, 1.05);
-ms-transform: scale(1, 1.05);
-o-transform: scale(1, 1.05);
transform: scale(1, 1.05);
}
100%{
-webkit-transform: scale(1, 1);
-moz-transform: scale(1, 1);
-ms-transform: scale(1, 1);
-o-transform: scale(1, 1);
transform: scale(1, 1);
}
}
@-moz-keyframes slide-down {
0%{
-webkit-transform: scale(1, 0);
-moz-transform: scale(1, 0);
-ms-transform: scale(1, 0);
-o-transform: scale(1, 0);
transform: scale(1, 0);
}
25%{
-webkit-transform: scale(1, 1.2);
-moz-transform: scale(1, 1.2);
-ms-transform: scale(1, 1.2);
-o-transform: scale(1, 1.2);
transform: scale(1, 1.2);
}
50%{
-webkit-transform: scale(1, 0.85);
-moz-transform: scale(1, 0.85);
-ms-transform: scale(1, 0.85);
-o-transform: scale(1, 0.85);
transform: scale(1, 0.85);
}
75%{
-webkit-transform: scale(1, 1.05);
-moz-transform: scale(1, 1.05);
-ms-transform: scale(1, 1.05);
-o-transform: scale(1, 1.05);
transform: scale(1, 1.05);
}
100%{
-webkit-transform: scale(1, 1);
-moz-transform: scale(1, 1);
-ms-transform: scale(1, 1);
-o-transform: scale(1, 1);
transform: scale(1, 1);
}
}
@-o-keyframes slide-down {
0%{
-webkit-transform: scale(1, 0);
-moz-transform: scale(1, 0);
-ms-transform: scale(1, 0);
-o-transform: scale(1, 0);
transform: scale(1, 0);
}
25%{
-webkit-transform: scale(1, 1.2);
-moz-transform: scale(1, 1.2);
-ms-transform: scale(1, 1.2);
-o-transform: scale(1, 1.2);
transform: scale(1, 1.2);
}
50%{
-webkit-transform: scale(1, 0.85);
-moz-transform: scale(1, 0.85);
-ms-transform: scale(1, 0.85);
-o-transform: scale(1, 0.85);
transform: scale(1, 0.85);
}
75%{
-webkit-transform: scale(1, 1.05);
-moz-transform: scale(1, 1.05);
-ms-transform: scale(1, 1.05);
-o-transform: scale(1, 1.05);
transform: scale(1, 1.05);
}
100%{
-webkit-transform: scale(1, 1);
-moz-transform: scale(1, 1);
-ms-transform: scale(1, 1);
-o-transform: scale(1, 1);
transform: scale(1, 1);
}
}
@keyframes slide-down {
0%{
-webkit-transform: scale(1, 0);
-moz-transform: scale(1, 0);
-ms-transform: scale(1, 0);
-o-transform: scale(1, 0);
transform: scale(1, 0);
}
25%{
-webkit-transform: scale(1, 1.2);
-moz-transform: scale(1, 1.2);
-ms-transform: scale(1, 1.2);
-o-transform: scale(1, 1.2);
transform: scale(1, 1.2);
}
50%{
-webkit-transform: scale(1, 0.85);
-moz-transform: scale(1, 0.85);
-ms-transform: scale(1, 0.85);
-o-transform: scale(1, 0.85);
transform: scale(1, 0.85);
}
75%{
-webkit-transform: scale(1, 1.05);
-moz-transform: scale(1, 1.05);
-ms-transform: scale(1, 1.05);
-o-transform: scale(1, 1.05);
transform: scale(1, 1.05);
}
100%{
-webkit-transform: scale(1, 1);
-moz-transform: scale(1, 1);
-ms-transform: scale(1, 1);
-o-transform: scale(1, 1);
transform: scale(1, 1);
}
}
.content .select.open ul{
max-height: 250px;
transform-origin: 50% 0;
-webkit-animation: slide-down 0.5s ease-in;
-moz-animation: slide-down 0.5s ease-in;
-o-animation: slide-down 0.5s ease-in;
animation: slide-down 0.5s ease-in;
-webkit-transition: max-height .2s ease-in;
-moz-transition: max-height .2s ease-in;
-ms-transition: max-height .2s ease-in;
-o-transition: max-height .2s ease-in;
transition: max-height .2s ease-in;
}
.content .select.open:after{
-webkit-transform: rotate(-225deg);
-moz-transform: rotate(-225deg);
-ms-transform: rotate(-225deg);
-o-transform: rotate(-225deg);
transform: rotate(-225deg);
top: 18px;
-webkit-transition: all .3s ease-in;
-moz-transition: all .3s ease-in;
-ms-transition: all .3s ease-in;
-o-transition: all .3s ease-in;
transition: all .3s ease-in;
}

使用JavaScript实现点击事件

实现点击事件还需要引用jQuery插件

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript">
  $(function(){
    $('.select > p').on('click', function (e) {
      // 检查class属性是否有open值,有则删除,没有则添加
      $('.select').toggleClass('open');
      // 处理冒泡事件
      e.stopPropagation();
    });
    $('.select ul li').on('click', function (e) {
      var _this = $(this);
      $('.select > p').text(_this.attr('data-value'));
      _this.addClass('selected').siblings().removeClass('selected');
      $('.select').removeClass('open');
      e.stopPropagation();
    });
    $(document).on('click', function () {
      $('.select').removeClass('open');
    });
  });
</script>

案例二:

案例二与案例一的html布局相似,只是在p标签后面多了一个i标签,用来显示右侧的三横,如下图

<div class="content">
  <div class="select">
    <p att="select p">所有选项</p>
    <i></i>
    <ul att="select ul">
      <li data-value="所有选项" class="selected">所有选项</li>
      <li data-value="html">html</li>
      <li data-value="css">css</li>
      <li data-value="javascript">javascript</li>
      <li data-value="jQuery">jQuery</li>
    </ul>
  </div>
</div>

css

整体样式与案例一相同

接下来是css样式

[att~=select]{
padding:;
margin:;
}
.content .select > i{
position: absolute;
top: 12px;
right: 10px;
width: 20px;
height: 12px;
border-top: 3px #cccccc solid;
border-bottom: 3px #cccccc solid;
cursor: pointer;
}
.content .select > i:after{
content: "";
position: absolute;
top: 4px;
left:;
width: 100%;
height: 3px;
background-color: #cccccc;
}
.content .select p{
padding: 0 15px;
line-height: 40px;
/*设置光标样式:手型*/
cursor: pointer;
}
.content .select ul{
width: 100%;
/*这样设置相当于隐藏了ul,便实现了下拉样式*/
height:;
list-style-type: none;
background-color: #ffffff;
position: absolute;
top: 20px;
left:;
z-index:;
overflow: hidden;
-webkit-transition: top .2s ease, height .2s ease;
-moz-transition: top .2s ease, height .2s ease;
-ms-transition: top .2s ease, height .2s ease;
-o-transition: top .2s ease, height .2s ease;
transition: top .2s ease, height .2s ease;
}
.content .select ul li{
padding: 0 15px;
line-height: 40px;
cursor: pointer;
opacity:;
-webkit-transform: translateX(300px);
-moz-transform: translateX(300px);
-ms-transform: translateX(300px);
-o-transform: translateX(300px);
transform: translateX(300px);
-webkit-transition: transform .3s ease;
-moz-transition: transform .3s ease;
-ms-transition: transform .3s ease;
-o-transition: transform .3s ease;
transition: transform .3s ease;
}
.content .select ul li:hover{
background-color: #e0e0e0;
}
.content .select ul li.selected{
background-color: #3399ff;
color: #ffffff;
}
.content .select.open ul{
height: 200px;
transform-origin: 50% 0;
top: -80px;
-webkit-transition: all .2s ease;
-moz-transition: all .2s ease;
-ms-transition: all .2s ease;
-o-transition: all .2s ease;
transition: all .2s ease;
}
.content .select.open ul li{
opacity:;
-webkit-transform: translateX(0);
-moz-transform: translateX(0);
-ms-transform: translateX(0);
-o-transform: translateX(0);
transform: translateX(0);
}
.content .select.open ul li:nth-child(1){
-webkit-transition: opacity .2s ease .05s, -webkit-transform .3s ease .05s;
-moz-transition: opacity .2s ease .05s, -moz-transform .3s ease .05s;
-ms-transition: opacity .2s ease .05s, -ms-transform .3s ease .05s;
-o-transition: opacity .2s ease .05s, -o-transform .3s ease .05s;
transition: opacity .2s ease .05s, transform .3s ease .05s;
}
.content .select.open ul li:nth-child(2){
-webkit-transition: opacity .2s ease .1s, -webkit-transform .3s ease .1s;
-moz-transition: opacity .2s ease .1s, -moz-transform .3s ease .1s;
-ms-transition: opacity .2s ease .1s, -ms-transform .3s ease .1s;
-o-transition: opacity .2s ease .1s, -o-transform .3s ease .1s;
transition: opacity .2s ease .1s, transform .3s ease .1s;
}
.content .select.open ul li:nth-child(3){
-webkit-transition: opacity .2s ease .15s, -webkit-transform .3s ease .15s;
-moz-transition: opacity .2s ease .15s, -moz-transform .3s ease .15s;
-ms-transition: opacity .2s ease .15s, -ms-transform .3s ease .15s;
-o-transition: opacity .2s ease .15s, -o-transform .3s ease .15s;
transition: opacity .2s ease .15s, transform .3s ease .15s;
}
.content .select.open ul li:nth-child(4){
-webkit-transition: opacity .2s ease .2s, -webkit-transform .3s ease .2s;
-moz-transition: opacity .2s ease .2s, -moz-transform .3s ease .2s;
-ms-transition: opacity .2s ease .2s, -ms-transform .3s ease .2s;
-o-transition: opacity .2s ease .2s, -o-transform .3s ease .2s;
transition: opacity .2s ease .2s, transform .3s ease .2s;
}
.content .select.open ul li:nth-child(5){
-webkit-transition: opacity .2s ease .25s, -webkit-transform .3s ease .25s;
-moz-transition: opacity .2s ease .25s, -moz-transform .3s ease .25s;
-ms-transition: opacity .2s ease .25s, -ms-transform .3s ease .25s;
-o-transition: opacity .2s ease .25s, -o-transform .3s ease .25s;
transition: opacity .2s ease .25s, transform .3s ease .25s;
}

js与案例一相同

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