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JavaScript implements three-level cascading special effects

小云云
Release: 2017-12-09 14:05:18
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This article mainly introduces JavaScript to implement three-level cascading special effects. Select the provincial capital and the corresponding county drop-down box will appear. At the same time, the city drop-down box will change. It has certain reference value. Interested friends can refer to it. I hope it can help. to everyone.

The example in this article shares the specific code for realizing three-level cascading special effects in js for your reference. The specific content is as follows


<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8">
    <title></title>
  </head>
  <body>

<!-- 实现效果:选择省会出现相应的县下拉框,同时市的下拉框改变-->
    <script type="application/javascript">  

    //二维数组存放市的信息
      var shi =[["丽水市","杭州市"],["新乡","郑州"]]; 
      //三维数组存放县的信息   

   var xianes = [[["云和","景宁"],["桐庐","原阳"]],[["卫辉","下乡"],["中原","二七"]]];
      //所选的省值

    var proIndex = 0;
      function sgc(){
        //获得所选择的省的下拉框值

     var pro = document.getElementById("sheng");
       //获得市的下拉框 

    var cit = document.getElementById("shi");
       //将省的value与市的一维数组下标所对应 

    proIndex = pro.value-1;

    //清空市下拉框中原有的值
        cit.options.length = 1;
        //通过for循环往下拉框中添加市的信息
        for(var i = 0;i < shi[proIndex].length;i++){
          var op = document.createElement("option");
          var citName = document.createTextNode(shi[proIndex][i]);
          op.value = i;
          op.appendChild(citName);
          cit.appendChild(op);          
        }      
      }

   //市的值改变后改变县的值
      function sic(){
        var are = document.getElementById("xian");
        var cit = document.getElementById("shi");
        are.options.length = 1;

    //通过proIndex获得所选的省的值作为县的数组的一维数组下标,通过cit.value作为县数组的二维数组下标,遍历获得数组值
        for(var i = 0;i<xianes[proIndex][cit.value].length;i++){
          var op = document.createElement("option");
          var areName = document.createTextNode(xianes[proIndex][cit.value][i]);
          op.value = i;
          op.appendChild(areName);
          are.appendChild(op);
        }
      }
    </script>

  //onchange():控件的value值改变后调用方法
    <select id = "sheng" onchange = "sgc();">
      <option>----省份---</option>
      <option value = "1">浙江省</option>
      <option value = "2">河南省</option>
    </select>
    <select id = "shi" onchange="sic();">
      <option>---市区---</option>
    </select>
    <select id = "xian" >
      <option>---县区---</option>
    </select>
  </body>
</html>
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