下拉框的搜索（有图，适用下拉选择内容较多，需要搜索，自动联想）

AppAsset::register($this);
//引入select2插件实现下拉搜索功能
AppAsset::addScript($this,"js/plugins/select2-master/dist/js/select2.min.js");
AppAsset::addScript($this,"js/plugins/select2-master/dist/js/i18n/zh-CN.js");
AppAsset::addCss($this, "js/plugins/select2-master/dist/css/select2.min.css");

<div class="form-group " >
   <label class="control-label">指定业务员</label>
   <select class="form-control" name=‘employee_name‘ id="customer-uid">   //这里加入id
          <option value=‘0‘>所有业务员</option>
              <?php foreach ($employee_names as $k=>$v){
                 if(@$old["$employee_names"] == $v){
                     echo "<option value=‘{$k}‘ selected>{$v}</option>";
                 }else{
                     echo "<option value=‘{$k}‘>{$v}</option>";
                 }
                }
               ?>
    </select>
</div>

  <script>
        $(function(){
            $("#customer-uid").select2(); //使用
        })
 </script>