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。