首页 > 代码库 > 常用的三联动实现

常用的三联动实现

<!DOCTYPE HTML><html><head><title>联动菜单</title><meta charset="utf-8" /><script>	/*使用 HTML DOM 的方式实现联动菜单*/	var categories=[    {      "id":10,      "name":‘男装‘,      "children":[        {"id":101,"name":‘正装‘},        {"id":102,"name":‘T恤‘},        {"id":103,"name":‘裤衩‘}      ]    },    {      "id":20,      "name":‘女装‘,      "children":[        {"id":201,"name":‘短裙‘},        {"id":202,"name":‘连衣裙‘},        {          "id":203,          "name":‘裤子‘,          "children":  [            {"id":2031,"name":‘长裤‘},            {"id":2031,"name":‘九分裤‘},            {"id":2031,"name":‘七分裤‘}          ]        },      ]    },    {"id":30,"name":‘童装‘,"children":[      {"id":301,"name":‘帽子‘},      {"id":302,"name":‘套装‘,"children":[        {"id":3021,"name":"0-3岁"},        {"id":3021,"name":"3-6岁"},        {"id":3021,"name":"6-9岁"},        {"id":3021,"name":"9-12岁"}      ]},      {"id":303,"name":‘手套‘}    ]}];	</script></head><body>	<div id="category"></div>  <script>    //查找id为category的div保存在div中     var div=document.getElementById("category");    //定义函数createSelect,接收一个数组参数arr    function createSelect(arr){       //创建一个select      var sel=document.createElement("select");      //创建一个option,设置其内容为"-请选择-",值为-1,将option添加到select中       sel.add(new Option("--请选择--",-1));      //遍历arr      for(var i=0;i<arr.length;i++){        //创建一个option,设置内容为当前元素的name属性,设置value为当前元素的id属性,将新option添加到select中        sel.add(new Option(arr[i].name,arr[i].id));             }//(遍历结束)      //为sel绑定onchange事件      sel.onchange=function(){        //反复:只要当前select不是div的lastChild        while(this!=div.lastChild)          //让div删除其lastChild           div.removeChild(div.lastChild);        //获得当前选中项的下表-1,保存在i中        var i=this.selectedIndex-1;        //如果arr中i位置的商品类别有children         if(i>=0&&arr[i].children!==undefined)          //用arr中i位置的商品类别的children数组创建下一个select          createSelect(arr[i].children);           }      //将select添加到div中       div.appendChild(sel);    }    createSelect(categories);  </script></body></html>

  

常用的三联动实现