javascript省市级联功能实现方法实例详解

本文实例讲述了javascript省市级联功能实现方法。分享给大家供大家参考，具体如下：

初步实现方法：

<html>
<head>
<script language="javascript">
 function changecity(){
 var province = document.form1.selprovince.value;
 var newoption1,newoption2;
 switch(province){
  case "四川省":
  newoption1 = new Option("成都市", "chengdu");
  newoption2 = new Option("绵阳市", "mianyang");
  break;
   case "湖北省" :
  newoption1= new Option("武汉市","wuhan");
  newoption2= new Option("襄樊市","xiangfan");
  break;
   case "山东省" :
   newoption1= new Option("青岛市","qingdao");
   newoption2= new Option("烟台市","yantai");
  break;
 }
 document.form1.selcity.options.length=0;
 document.form1.selcity.options.add(newoption1);
 document.form1.selcity.options.add(newoption2);
 }
</script>
</head>
<form name="form1" action="" method="post">
 <select name="selprovince" onchange="changecity()">
 <option>--请选择开户帐号的省份--</option>
 <OPTION value="四川省">四川省</OPTION>
 <OPTION value="山东省">山东省</OPTION>
 <OPTION value="湖北省">湖北省</OPTION>
 </select>
 <select name="selcity">
 <option>--请选择开户帐号的城市--</option>
 </select>
</form>
</html>

改进实现方法：

<html>
<head>
<script language="javascript">
 function changecity(){
 var cityList = new Array();
 cityList[0]=['成都', '绵阳', '德阳', '自贡'];
 cityList[1]=['济南', '青岛', '淄博', '枣庄'];
 cityList[2]=['武汉', '宜昌', '荆州', '襄樊'];
 var pindex = document.form1.selprovince.selectedIndex-1;
 var newoption1;
 document.form1.selcity.options.length = 0;
 for(var j in cityList[pindex]){
  newoption1 = new Option(cityList[pindex][j], cityList[pindex][j]);
  document.form1.selcity.options.add(newoption1);
 }
 }
</script>
</head>
<form name="form1" action="" method="post">
 <select name="selprovince" onchange="changecity()">
 <option>--请选择省份--</option>
 <OPTION value="四川省">四川省</OPTION>
 <OPTION value="山东省">山东省</OPTION>
 <OPTION value="湖北省">湖北省</OPTION>
 </select>
 <select name="selcity">
 <option>--请选择城市--</option>
 </select>
</form>
</html>

改进方法2：

<html>
<head>
<script language="javascript">
 function citychange(){
 var cityList = new Array();
 cityList['辽宁省'] = ['沈阳','鞍山','大连'];
 cityList['山东省'] = ['济南','烟台','蓬莱'];
 cityList['山西省'] = ['太原','大同','平遥'];
 var pindex = document.form1.selprovince.value;
 var newoption1;
 document.form1.selcity.options.length = 0;
 for(var i in cityList[pindex]){
  newoption1 = new Option(cityList[pindex][i],cityList[pindex][i]);
  document.form1.selcity.options.add(newoption1);
 }
 }
</script>
</head>
<form action="" name="form1" method="post">
 <select name="selprovince" onchange="citychange()">
 <option>请选择省份</option>
 <OPTION value="辽宁省">辽宁省</OPTION>
 <OPTION value="山东省">山东省</OPTION>
 <OPTION value="山西省">山西省</OPTION>
 </select>
 <select name="selcity">
 <option>请选择城市</option>
 </select>
</form>
</html>

希望本文所述对大家JavaScript程序设计有所帮助。