jQuery实现select级联

时间：2022-11-15 14:41:41
使用Html5的数据属性(data-*)Map级联关系，代码如下：
 <!DOCTYPE html>

 <html>

 <head>

     <title>Select级联</title>

     <script src="https://code.jquery.com/jquery-1.12.4.min.js"></script>

     <script type=text/javascript>

         $(document).ready(function () {

             //获取子select的option

             let childOptions = $("select[name='children']").find("option");

             $("select[name='parent']").change(cascadeSelect);

             //级联过滤方法

             function cascadeSelect(event) {

                 //获取选中index及value

                 let index = event.target["selectedIndex"];

                 let item = event.target[index].value;

                 //过滤方法1

                 let options = childOptions.filter(function () {

                     return (this.value == "" || this.dataset.parent == item);

                 });

                 //过滤方法2

                 // let options = Array.from(childOptions).filter(function (option) {

                 //     return option.value == "" || option.dataset.parent == item

                 // });

                 //清空子select,重新绑定，并设定默认选中项

                 $("select[name='children']").empty().append(options);

                 $("select[name='children']").find("option[value='']").prop("selected", true);

             }

         });

     </script>

 </head>

 <body>

     <select name="parent">

         <option value="" selected>请选择</option>

         <option value="1">选项1</option>

         <option value="2">选项2</option>

         <option value="3">选项3</option>

         <option value="4">选项4</option>

         <option value="5">选项5</option>

     </select>

     <select name="children">

         <!-- 使用data-*属性Map级联关系 -->

         <option data-parent="" value="" selected>请选择</option>

         <option data-parent="1" value="1">子选项1-1</option>

         <option data-parent="1" value="2">子选项1-2</option>

         <option data-parent="1" value="3">子选项1-3</option>

         <option data-parent="1" value="4">子选项1-4</option>

         <option data-parent="1" value="5">子选项1-5</option>

         <option data-parent="2" value="6">子选项2-1</option>

         <option data-parent="2" value="7">子选项2-2</option>

         <option data-parent="2" value="8">子选项2-3</option>

         <option data-parent="2" value="9">子选项2-4</option>

         <option data-parent="3" value="10">子选项3-1</option>

         <option data-parent="3" value="11">子选项3-2</option>

         <option data-parent="3" value="12">子选项3-3</option>

         <option data-parent="4" value="13">子选项4-1</option>

         <option data-parent="4" value="14">子选项4-2</option>

         <option data-parent="4" value="15">子选项4-3</option>

         <option data-parent="4" value="16">子选项4-4</option>

         <option data-parent="4" value="17">子选项4-5</option>

         <option data-parent="5" value="18">子选项5-1</option>

         <option data-parent="5" value="19">子选项5-2</option>

         <option data-parent="5" value="20">子选项5-3</option>

     </select>

 </body>

 </html>

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