在一個(gè)jsp頁(yè)面實(shí)現二級下拉框聯(lián)動(dòng)，實(shí)時(shí)讀取數據庫數據，這個(gè)方法非常使用，只需要修改很小的地方就可以使用。設計的文件，serch.jsp，main.js，bytetostr.js，
先講一下main.js，這是javascript，其中注意修改jsp頁(yè)面名稱(chēng)。
function findObject(fName,initValue)...{
var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
xmlhttp.open("POST","searchmx.jsp?findObject="+fName+"&initValue="+initValue,false);//注意修改jsp頁(yè)面
xmlhttp.send();
document.getElementById(fName).innerHTML=bytes2BSTR(xmlhttp.responsebody); //bytes2BSTR函數在bytetostr.js中
}
其次為bytetostr.js，這是vbscript，這個(gè)不需要修改任何內容，他的主要功能就是讀取數據轉換字符串用的。
Function bytes2BSTR(vIn)
dim i
strReturn = ""
For i = 1 To LenB(vIn)
ThisCharCode = AscB(MidB(vIn,i,1))
If ThisCharCode < &H80 Then
strReturn = strReturn & Chr(ThisCharCode)
Else
NextCharCode = AscB(MidB(vIn,i+1,1))
strReturn = strReturn & Chr(CLng(ThisCharCode) * &H100 + CInt(NextCharCode))
i = i + 1
End If
Next
bytes2BSTR = strReturn
End Function
接下來(lái)就是serch.jsp頁(yè)面，只需要修改div中的id為你想要的名字，再將一開(kāi)始的包更換一下，已經(jīng)sql語(yǔ)句改下就可以了，有不明白的可以參與討論
<%@ page contentType="text/html; charset=gb2312" language="java" import="com.sjth.zdsygl.vo.*,com.sjth.zdsygl.biz.*,java.util.*,com.sjth.zdsygl.jdbc.*, java.sql.ResultSet"%>//導入相應的包
<%
//這部分代碼用于執行查詢(xún)數據庫，返回字符串
if (request.getParameter("findObject")!=null)...{
if (request.getParameter("findObject").equals("hy_dm"))...{
DBConnect conn = null;
ResultSet rs = null;
try...{
out.print("<select name=‘hy_dm‘ onchange="javascript:findObject(‘hymx_dm‘,this.value)">");
String sql = "select * from dm_hy group by left(hy_dm,7)";
conn = new DBConnect();
conn.setPstmt(sql);
rs = conn.executeQuery(sql);
while(rs.next())...{
out.print("<option value=‘"+rs.getString("hy_dm")+"‘>"+rs.getString("hy_mc")+"</option>");
}
out.print("</select>");
}
catch (Exception e)...{
}
finally...{
try...{
if (rs != null)
rs.close();
if (conn != null)
conn.close();
}
catch (Exception e)...{
e.printStackTrace();
}
}
}
if (request.getParameter("findObject").equals("hymx_dm"))...{
DBConnect conn = null;
ResultSet rs = null;
try...{
out.print("<select name=‘hymx_dm‘ >");
String sql = null;
if (request.getParameter("initValue").equals(""))...{
sql = "select * from dm_hy";
}
else...{
sql = "select * from dm_hy where hy_dm like ‘"+request.getParameter("initValue")+"%‘";
}
conn = new DBConnect();
conn.setPstmt(sql);
rs = conn.executeQuery(sql);
while(rs.next())...{
out.print("<option value=‘"+rs.getString("hy_dm")+"‘>"+rs.getString("hy_mc")+"</option>");
}
out.print("</select>");
}
catch (Exception e)...{
}
finally...{
try...{
if (rs != null)
rs.close();
if (conn != null)
conn.close();
}
catch (Exception e)...{
e.printStackTrace();
}
}
}
return;
}
%>
<html>
<head>
<link href=" <script language=vbscript src="css/bytetostr.js"></script>
<script language=javascript src="css/main.js"></script>//導入兩個(gè)js文件
</head>
<body>
<div>所屬行業(yè)：</div>
<div id="hy_dm"></div> //用來(lái)顯示返回的字符串
<div >所屬明細行業(yè)：</div>
<div id="hymx_dm"></div>//用來(lái)顯示返回的字符串
</body>
</html>
<script language="javascript">
findObject("hy_dm","");
findObject("hymx_dm","");//這兩條是頁(yè)面執行是調用
</script>
歡迎大家討論
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