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Detailed explanation of examples of implementation methods of javascript province and city cascade functions_javascript skills

WBOY
WBOYOriginal
2016-05-16 15:36:041343browse

The example in this article describes the implementation method of JavaScript province and city cascading function. Share it with everyone for your reference, the details are as follows:

Initial implementation method: 

<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>

Improved implementation method: 

<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>

Improvement method 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>

I hope this article will be helpful to everyone in JavaScript programming.

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