javascript省市级联功能实现方法实例详解

2019-11-20 11:26:26

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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。

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