jsp中select的onchange事件用法实例

本文实例讲述了jsp中select的onchange事件用法。分享给大家供大家参考，具体如下：

<script language = "JavaScript">
 var onecount;
 onecount=0;
 subcat = new Array();
 <%
 int count = 0;
 java.sql.ResultSet rs1 = DBManage.executeQuery("select hydm,zhydm,zhymc from zhy ");//读取数据
 while(rs1.next())
 {
 String selhydm=rs1.getString("hydm").trim();
 String zhydm=rs1.getString("zhydm").trim();
 String zhymc=rs1.getString("zhymc").trim();
 %>
 subcat[<%=count%>] = new Array("<%=zhydm%>","<%=selhydm%>","<%=zhymc%>");//产生数组
 <%
 count = count + 1;
 }
 if(rs1!=null) DBManage.closeCOnn();
 %>
 onecount=<%=count%>;
 function changelocation(id)
 {
 document.form1.selzhy.length = 0;
 var hydm=id;
 var i;
 document.form1.selzhy.options[0] = new Option('选择子行业分类','');
 for (i=0;i < onecount; i++)
 {
 if (subcat[i][1] == hydm)
 {
 document.form1.selzhy.options[document.form1.selzhy.length] = new Option(subcat[i][2], subcat[i][0]);
 }
 }
 }
</script>
<table width="500" border="0" cellspacing="0" cellpadding="0" align="center">
 <tr>
 <td width="180" height="20" align="right">选择行业分类:</td>
 <td width="320">
 <select name="selhy" onChange="changelocation(document.form1.selhy.options[document.form1.selhy.selectedIndex].value)" size="1" >
 <option value="2">请选择行业分类</option>
 <%
 rs = DBManage.executeQuery("select * from hy");
 while(rs.next())
 {
  String hydm=rs.getString("hydm").trim();
  String hymc=rs.getString("hymc").trim();
 %>
 <option value="<%=hydm%>"><%=hymc%></option>
 <%
 }
 if(rs!=null) DBManage.closeCOnn();
 %>
 </select>
 </td>
 </tr>
 <tr>
 <td height="20" align="right">选择子行业分类:</td>
 <td>
 <select name="selzhy" >
 <option value="" selected>请选择子行业分类</option>
 </select>
 </td>
 </tr>
</table>

<form name=form1>
 <select name=province onchange="cityName(this.selectedIndex)">
  <option value="">请选择省名</option>
 </select>
 <select name=city>
  <option value="">请选择城名</option>
 </select>
 </form> 

 <script language=javascript>
 var city1 = ["杭州", "宁波", "温州", "绍兴", "金华", "湖州"];
 var city2 = ["南京", "苏州", "无锡", "常州", "镇江", "徐州"];
 var city3 = ["合肥", "翕县", "黄山", "祁门", "休宁"];
 var city4 = ["南昌", "九江", "赣州", "上饶", "新余", "景德镇"];
 var provinceName = ["浙江", "江苏", "安徽", "江西"];
 function province()
 {
   var e = document.form1.province;
   for (var i=0; i<provinceName.length; i++)
    e.options.add(new Option(provinceName[i], provinceName[i]));
 }
 function cityName(n)
 {
   var e = document.form1.city;
   for (var i=e.options.length; i>0; i--)  e.remove(i);
   if (n == 0) return;
   var a = eval("city"+ n); //得到城市的数组名
   for (var i=0; i<a.length; i++) e.options.add(new Option(a[i], a[i]));
 }
 function window.onload()
 {
   province(); //初始时给省名下拉菜单赋内容
 }
 </script>

希望本文所述对大家JSP程序设计有所帮助。