Implement drop-down box beautification effects based on jquery

Most of the styles of the native select drop-down boxes we usually use cannot be modified, resulting in very different styles from the design drawings in different browsers. So in order to beautify it, I used JQ to simulate a drop-down box, and you can define the style at will. The native drop-down box is also kept hidden in the div to facilitate back-end developers to operate it.

The rendering is as follows:

The HTML code is as follows:

<!DOCTYPE html>
<html lang="zh-CN">
<head>
 <meta charset="UTF-8">
 <title>下拉框美化</title>
 <link href="css/style.css" rel="stylesheet"/>
 <script src="js/jquery-1.9.1.min.js"></script>
 <script src="js/simSelect.js"></script>
 <script>
  $(function(){
  //下面是调用初始化语句，class名可通用，也可以ID单独定义
  $(".select-box").simSelect();    //什么参数都不带，默认样式。建议用这个，参数都写在div上面好了，比较直观。

  $(".slt-box01").simSelect({    //所有参数如下：
   maxNum: 4,           //最大下拉个数(超过则显示滚动条)，默认为5 
   width: 250,           //下拉框盒子宽度，默认为200px。为避免过多的设置宽度，尽量依照项目中最常见的宽度设定css样式。
   direction: "down",       //下拉方向，默认down，另一个是up
   disabled: false         //是否禁用，默认不禁，禁的话是true
  });

  $(".slt-box02").simSelect({    //举例：这里写参数，div上面也写参数的情况。结果是：会以div上面的为准
   maxNum: 4,           
   width: 250,           
   direction: "down"
  });

  $(".slt-box03").simSelect({    //禁用下拉框的话，有三种写法，任选。建议第二种：
   disabled: true,         //一：这里的参数写disabled:true 二：给div加class="disabled" 三：给原生select加disabled="true"
   width: 250           
  });

  $("#slt-box04").simSelect();   //ID单独定义。单个option可以禁用
 });
</script>
</head>
<body>
 <!-- wrap和table非必需,用于布局而已 --> 
 <div class="wrap">
  <table width="600">
   <tbody>
    <tr>
     <th>不带参数：</th>
     <td><div class="select-box">
      <select>
       <option>第一个选项</option>
       <option>第二个选项</option>
       <option>第三个选项</option>
       <option>第四个选项</option>
       <option>第五个选项</option>
       <option>第六个选项</option>
      </select>
     </div></td>
    </tr>
    <tr>
     <th>初始化语句写了参数：</th>
     <td><div class="slt-box01">
      <select>
       <option>第一个选项</option>
       <option>第二个选项</option>
       <option>第三个选项</option>
       <option>第四个选项</option>
       <option>第五个选项</option>
       <option>第六个选项</option>
      </select>
     </div></td>
    </tr>
    <tr>
     <th>在div上面写参数：</th>
     <td><div class="slt-box02 up" max-num="6" width="300">
      <select>
       <option>第一个选项</option>
       <option>第二个选项</option>
       <option>第三个选项</option>
       <option>第四个选项</option>
       <option>第五个选项</option>
       <option>第六个选项</option>
      </select>
     </div></td>
    </tr>
    <tr>
     <th>禁用的样式：</th>
     <td><div class="slt-box03">
      <select>
       <option>第一个选项</option>
       <option>第二个选项</option>
       <option>第三个选项</option>
       <option>第四个选项</option>
       <option>第五个选项</option>
       <option>第六个选项</option>
      </select>
     </div></td>
    </tr>
    <tr>
     <th>其中一个选项禁用：</th>
     <td><div id="slt-box04" class="up" max-num="4" width="200">
      <select>
       <option>第一个选项</option>
       <option>第二个选项超长超长超长超长长啊</option>
       <option disabled="true">第三个选项</option>
       <option>第四个选项</option>
       <option>第五个选项</option>
       <option>第六个选项</option>
      </select>
     </div></td>
    </tr>
   </tbody>
  </table>
 </div>
</body>
</html>

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The CSS style is as follows:

@charset "utf-8";
/* 简单reset */
body, ul, li {
  margin: 0;
  padding: 0;
}
body {
  font: 14px/24px Microsoft YaHei;
  color: #333;
}
ul { list-style: none; }
a {
  color: #333;
  outline: none;
  text-decoration: none;
}
table {
  border-collapse: collapse;
  border-spacing: 0;
  text-align: left;
}
/* 布局样式，非必须 */
.wrap {
  width: 600px;
  margin: 100px auto 0;
  padding: 20px;
  background-color: #d3f3dd;
}
.wrap table th, .wrap table td { padding: 8px 2px; }
.wrap table th {
  font-weight: normal;
  text-align: right;
}
/* 下拉框样式 必须 */
.select-style ul {
  list-style: none;
  padding: 0;
  margin: 0;
}
.select-style select { display: none; }
.select-style {
  position: relative;
  display: inline-block;
  font-family: Microsoft YaHei;
  color: #666;
  font-size: 14px;
  text-align: left;
  vertical-align: middle;
  z-index: 50;
}
.select-style.focus { z-index: 51; }
.select-style .slt-wrap {
  display: inline-block;
  width: 200px;
  border: solid 1px #d6d6d6;
  vertical-align: middle;
}
.select-style.focus .slt-wrap { border: solid 1px #53a8df; }
.select-style .slt-title {
  position: relative;
  display: block;
  padding: 0 36px 0 5px;
  line-height: 30px;
  height: 30px;
  text-decoration: none;
  background-color: #fff;
  word-break: break-all;
  color: #666;
  overflow: hidden;
}
.select-style .slt-title .slt-text {
  display: inline-block;
  height: 30px;
 *cursor: pointer;
}
.select-style .slt-title i {
  position: absolute;
  right: 0;
  top: 0;
  display: inline-block;
  width: 30px;
  height: 30px;
  background: url(../images/ico-select.png) 0 0 no-repeat;
  *cursor: pointer;
}
.select-style.focus .slt-title i { background-position: 0 -30px; }
.select-style.disabled .slt-title i { 
  background-position: 0 -60px;
  *cursor: default; 
}
.select-style .opn-box {
  display: none;
  position: absolute;
  left: 0;
  top: 31px;
  width: 100%;
}
.select-style.up .opn-box {
  top: auto;
  bottom: 31px;
}
.select-style .opn-box .opn-list {
  position: relative;
  _width: 100%;
  max-height: 130px;
  border: 1px solid #d6d6d6;
  background: #fff;
  overflow-y: auto;
  overflow-x: hidden;
}
.select-style.focus .opn-box .opn-list { border-color: #53a8df; }
.select-style .opn-box .opn-list li {
  display: block;
  _width: 100%;
  padding-left: 5px;
  line-height: 26px;
  height: 26px;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  cursor: pointer;
}
.select-style .opn-box .opn-list .selected { background: #d4edfe; }
.select-style .opn-box .opn-list li:hover {
  color: #fff;
  background: #65abda;
}
.select-style .opn-box .opn-list li.disabled {
  color: #cacaca;
  background: #f0f0f0;
  cursor: default;
}
.select-style.disabled .slt-wrap { border: 1px solid #d6d6d6; }
.select-style.disabled .slt-title {
  color: #cacaca;
  background-color: #f0f0f0;
  cursor: default;
}
.select-style.disabled .slt-title .slt-text { *cursor: default; }
/* 下拉框样式 结束 */

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Jquery code is as follows:

/** 
 *  Name  : 美化下拉框 
 **/
 (function(jQuery){
   $.fn.simSelect = function (o) {
    o = $.extend({                  //设置默认参数 
      maxNum: 5,                  //最大显示5个
      width: 200,                  //默认宽200px。为避免过多的设置宽度，尽量依照项目中最常见的宽度设定css样式。
      direction: "down",              //向下拉，另一个是up  
      disabled: false                //不可用时为true
    },o || {});
    return this.each(function(){          //构造开始
      if($(this).children(".slt-wrap")){      //去重复  
        $(this).children(".slt-wrap").remove();
      };
      var $ts = $(this),
        $select = $ts.find("select").eq(0),
        wid = parseFloat($ts.attr("width")),
        num = parseFloat($ts.attr("max-num")),
        $sltWrap = $("<div class='slt-wrap'></div>").prependTo($ts),
        $sltTit = $("<a class='slt-title' hidefocus='true' href='javascript:void(0);'><span class='slt-text'></span><i></i></a>").prependTo($sltWrap),
        $sltText = $(".slt-text", $sltTit),
        $opnBox = $("<div class='opn-box'><ul class='opn-list'></ul></div>").appendTo($sltWrap),
        $opnList = $(".opn-list", $opnBox);
      $ts.addClass("select-style");                //增加一个class专门作为写css样式用
      $select.find("option").each(function(i){          //循环生成li标签  
        var text = $(this).text(),
          $li = $("<li title='"+text+"'>"+text+"</li>").appendTo($opnList);
        if(this.selected){
          $li.addClass("selected");
          $sltText.text(text).attr("title",text);  
        };
        if(this.disabled){
          $li.addClass("disabled");
          return;
        };
      });
      var $li = $("li",$opnList),
        hei = $li.height();
      if(wid){                          //设置宽度
        $ts.css("width",wid+"px");              //兼容IE6、7
        $sltWrap.css("width",wid-2+"px");                
      }else{
        $ts.css("width",o.width+"px");            //兼容IE6、7
        $sltWrap.css("width",o.width-2+"px");
      };  
      if(num){                          //设置高度
        $opnList.css("max-height", hei*num+"px");
      }
      else{
        $opnList.css("max-height", hei*o.maxNum+"px");
      };
      if(o.direction == "up"){                  //设置上、下拉方向
        $ts.addClass("up");
      };
      $li.on("click",function(){                  //li标签的点击事件，传给原生select
        var index = $opnList.find("li").index(this),
          text = $(this).text();
        if($(this).hasClass("disabled")){
          return false;
        };
        $(this).addClass("selected").siblings().removeClass("selected");
        $select.find("option").prop("selected",false).eq(index).prop("selected",true);
        $sltText.text(text).attr("title",text);
        $opnBox.hide();
        $ts.removeClass("focus");
      });
      $sltTit.on("click",function(e){               //a标签的点击下拉事件
        e.stopPropagation();                  //阻止a标签的点击冒泡    
        if($opnBox.is(":hidden")){
          $(".select-style .opn-box").hide();         
          $(".select-style").removeClass("focus");
          $opnBox.show();
          $ts.addClass("focus");
        }
        else{
          $opnBox.hide();
          $ts.removeClass("focus");
        }
      });
      $select.on("change",function(){                //原生select的点击事件，传给ul
        var index = $(this).find("option:selected").index(),
          text = $li.eq(index).text();
        $li.eq(index).addClass("selected").siblings().removeClass("selected");
        $sltText.text(text).attr("title",text);
      });
      $(document).on("click",function(e){              //点击其他地方收起下拉框
        if($opnBox.is(":visible")){
          $opnBox.hide();
          $ts.removeClass("focus");
        }  
      });
      if($select.prop("disabled") == true || o.disabled == true || $ts.hasClass("disabled")){
        $sltTit.off("click");                  //设置禁用状态
        $select.prop("disabled",true);
        $ts.addClass("disabled");
      };
    });
  };
})(jQuery);

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Compatible with IE7+ (IE6 actually works, but there will be no scroll bar when there are more than 5 options).

The above is the entire content of this article, I hope it will be helpful to everyone’s study.