用JSP实现下拉列表框三级联动效果

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jsp/servlet

JSP SQL Microsoft J#JDBC

一、在数据库数据库中建立三个表
1.city
字段：
districtname，locationid，districtid
2.province
字段：
locationid，locationname
3.village
字段：
villageid,villagename,districtid
二、代码如下：
<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<%@ page import="java.sql.* "%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>jsp实现三级联动的下拉列表框效果</title>
<%
   Connection conn=null;
   Statement stmt=null;
   ResultSet rs=null,rs1=null,rs2=null;
   String sql;
   int count;
   int count2;
   String drivername="com.microsoft.jdbc.sqlserver.SQLServerDriver";
   String url="jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=SJLD";
   try{
    Class.forName(drivername);
    conn=DriverManager.getConnection(url,"sa","");
    stmt=conn.createStatement（）;
    sql="select * from city order by locationid asc";
    rs=stmt.executeQuery(sql);
   }catch(SQLException e){
    System.out.println(e.getMessage());
   }

%>
<script language="javascript">
var onecount;
onecount=0;
subcat=new Array();
<%
count=0;
while(rs.next()){
%>
subcat[<%=count%>]=new Array("<%=rs.getString("districtname")%>","<%=rs.getInt("locationid")%>","<%=rs.getInt("districtid")%>");
<%
count = count + 1 ;

}
rs.close();
rs=null;
%>
onecount=<%=count%>;
function changelocation(locationid){
document.myform.smalllocation.length=0;
var locationid=locationid;
var i;
document.myform.smalllocation.options[0]=new Option('==所选城市的地区==','');
for(i=0;i<onecount;i++){
if (subcat[i][1] == locationid)
{
document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[i][0], subcat[i][2]);
}
}


}
</script>
<%
sql="select * from village order by districtid asc";
rs2=stmt.executeQuery(sql);
%>
<script language="javascript">
var onecount2;
onecount2=0;
subcat2=new Array();
<%
count2=0;
while(rs2.next()){
%>
subcat2[<%=count2%>]=new Array("<%=rs2.getString("villagename")%>","<%=rs2.getInt("districtid")%>","<%=rs2.getInt("villageid")%>");
<%
count2 = count2 + 1 ;

}
rs2.close();
rs2=null;
%>
onecount2=<%=count2%>;
function changelocation2(districtid)
{
document.myform.village.length = 0;

var districtid=districtid;
var j;
document.myform.village.options[0] = new Option('==所选地区的县区==','');
for (j=0;j < onecount2; j++)
{
if (subcat2[j][1] == districtid)
{
document.myform.village.options[document.myform.village.length] = new Option(subcat2[j][0], subcat2[j][2]);
}
}

}
</script>

</head>
<body>
<form name="myform" method="post">
分类：<select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)" size="1">
<option selected>请选择你所在的省份</option>
<%
sql ="select * from province order by locationname asc";
rs1 = stmt.executeQuery(sql);
while(rs1.next()){
%>
<option value="<%=rs1.getInt("locationid")%>"><%=rs1.getString("locationname")%></option>

<% }

rs1.close();
rs1 = null;
conn.close();
conn =null;

%>
</select><select name="smalllocation" onChange="changelocation2(document.myform.smalllocation.options[document.myform.smalllocation.selectedIndex].value)">
<option selected value="">==所有地区==</option>
</select><select name="village" size="1">
<option selected>==所有县区==</option>
</select>
</form>

</body>
</html>

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tomcat线程池配置一 | <select>筛选<table>的简单实现

2009-09-12 16:13
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