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。
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