一个强健 实用的ajax二级联动菜单(有演示和附源程序打包下载)
前些天在搞后台的时候要用到二级联动的菜单,到网上去找了半天也没找到满意的,不是这错就是那错,在选择的时候有时候不能返回.真是郁闷.
后来就看到有人用ajax写了无限级分类(牛,呵呵,本人看不懂.).就想到我那个后台不也可以用ajax试试,虽然比用javascript的慢点,但我这个实用.强健..不会出错,也不会选择某个大类后再返回无选择状态小类为空的状态.呵呵.
文件目录:如图
主要代码如下:
index.asp
复制代码代码如下:
<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" c />
<title>Ajax的二级联动by啊峰</title>
<script language="javascript" src="js.js"></script>
</head>
<body>
<h2><a href="http://yeahdown.com/">Ajax的二级联动by啊峰</a></h2>
<!--#include file="iconn.asp"-->
<%
Set afeng = Conn.Execute("select bigclassid,bigclassname from bigclass")
%>
<form id="form1" name="form1" method="post" action="">
<div id="bigclass" style="float:left">
<select name="select" >
<option value="0">选择一级分类</option>
<%If Not afeng.Eof then
Do While Not afeng.Eof
bigclassid= afeng("bigclassid")
bigclassname = afeng("bigclassname")%>
<option value="<%=bigclassid%>"><%=bigclassname%></option>
<%afeng.Movenext
Loop
End If
afeng.Close
Set afeng = Nothing
Conn.Close
Set Conn = Nothing%>
</select>
</div>
<div id="subclass" style="float:left"><select name="select2">
<option value="0">选择二级分类</option>
</select>
</div>
</form>
</body>
</html>
getsubcategory.asp文件:
复制代码代码如下:
<%
Response.Charset="GB2312" '设置字符集 原默认为utf-8
bigclassid=safe(request.QueryString("bigclassid")) '非法字符过滤
If bigclassid<>"" Then
Set Re=New RegExp
Re.IgnoreCase=true
Re.Global=false
Re.Pattern = "^[0-9]{1,3}$"
If Not Re.Test(bigclassid) Then
Response.Write "非法参数"
Response.End
End If%>
<!--#include file="iconn.asp"-->
<%On error Resume Next
set p = conn.execute("select * from smallclass where bigclassid="&bigclassid&"")
If Err Then
Err.Clear
Response.Write "查询出错"
Response.End
End If
If Not p.Eof Then
html = "<select name='smallclassid'>"&vbnewline
Do While Not p.Eof
html = html&"<option value='"&p("smallclassid")&"'>"&p("smallclassname")&"</option>"&vbnewline
p.Movenext
Loop
html = html&"</select>"
Else
html = "<select name='smallclassid'><option value='0' selected>暂无小类</option></select>"
End If
p.Close
Set p = Nothing
Conn.Close
Set Conn = Nothing
Response.write html
html = ""
End If
%>
iconn.asp文件:
复制代码代码如下:
<%
Set conn=server.CreateObject("adodb.connection")
db = "$#yeahdown.com@$$$@@%%.asp"
C & Server.MapPath(db)
On Error Resume Next
conn.open ConnStr
If Err Then
Err.Clear
Response.Write "<div id=""error"">连接数据库出错</div>"
Response.End
End If
Function safe(Str)
If Isnull(Str) Then
safe = ""
Exit Function
End If
Str = Replace(Str,Chr(0),"", 1, -1, 1)
Str = Replace(Str, """", """, 1, -1, 1)
Str = Replace(Str,"<","<", 1, -1, 1)
Str = Replace(Str,">",">", 1, -1, 1)
Str = Replace(Str, "script", "script", 1, -1, 0)
Str = Replace(Str, "SCRIPT", "SCRIPT", 1, -1, 0)
Str = Replace(Str, "Script", "Script", 1, -1, 0)
Str = Replace(Str, "script", "Script", 1, -1, 1)
Str = Replace(Str, "object", "object", 1, -1, 0)
Str = Replace(Str, "OBJECT", "OBJECT", 1, -1, 0)
Str = Replace(Str, "Object", "Object", 1, -1, 0)
Str = Replace(Str, "object", "Object", 1, -1, 1)
Str = Replace(Str, "applet", "applet", 1, -1, 0)
Str = Replace(Str, "APPLET", "APPLET", 1, -1, 0)
Str = Replace(Str, "Applet", "Applet", 1, -1, 0)
Str = Replace(Str, "applet", "Applet", 1, -1, 1)
Str = Replace(Str, "[", "[")
Str = Replace(Str, "]", "]")
Str = Replace(Str, """", "", 1, -1, 1)
Str = Replace(Str, "=", "=", 1, -1, 1)
Str = Replace(Str, "'", "''", 1, -1, 1)
Str = Replace(Str, "select", "select", 1, -1, 1)
Str = Replace(Str, "execute", "execute", 1, -1, 1)
Str = Replace(Str, "exec", "exec", 1, -1, 1)
Str = Replace(Str, "join", "join", 1, -1, 1)
Str = Replace(Str, "union", "union", 1, -1, 1)
Str = Replace(Str, "where", "where", 1, -1, 1)
Str = Replace(Str, "insert", "insert", 1, -1, 1)
Str = Replace(Str, "delete", "delete", 1, -1, 1)
Str = Replace(Str, "update", "update", 1, -1, 1)
Str = Replace(Str, "like", "like", 1, -1, 1)
Str = Replace(Str, "drop", "drop", 1, -1, 1)
Str = Replace(Str, "create", "create", 1, -1, 1)
Str = Replace(Str, "rename", "rename", 1, -1, 1)
Str = Replace(Str, "count", "count", 1, -1, 1)
Str = Replace(Str, "chr", "chr", 1, -1, 1)
Str = Replace(Str, "mid", "mid", 1, -1, 1)
Str = Replace(Str, "truncate", "truncate", 1, -1, 1)
Str = Replace(Str, "nchar", "nchar", 1, -1, 1)
Str = Replace(Str, "char", "char", 1, -1, 1)
Str = Replace(Str, "alter", "alter", 1, -1, 1)
Str = Replace(Str, "cast", "cast", 1, -1, 1)
Str = Replace(Str, "exists", "exists", 1, -1, 1)
Str = Replace(Str,Chr(13),"<br>", 1, -1, 1)
safe = Replace(Str,"'","''", 1, -1, 1)
End Function
%>
最后一个js.js
复制代码代码如下:
function createxmlhttp()
{
xmlhttpobj = false;
try{//创建对象，一个一个的试，哎，要是能统一标准都好。。
xmlhttpobj = new XMLHttpRequest;
}catch(e){
try{
xmlhttpobj=new ActiveXObject("MSXML2.XMLHTTP");
}catch(e2){
try{
xmlhttpobj=new ActiveXObject("Microsoft.XMLHTTP");
}catch(e3){
xmlhttpobj = false;
}
}
}
return xmlhttpobj;
}
function getsubcategory(bigclassid){
if(bigclassid==0){
document.getElementById("subclass").innerHTML="<select name='smallclassid'><option value='0' selected>选择二级分类</option></select>";
return;
};
var xmlhttpobj = createxmlhttp();
if(xmlhttpobj){//如果创建对象xmlhttpobj成功
xmlhttpobj.open('get',"getsubcategory.asp?bigclassid="+bigclassid+"&number="+Math.random(),true);//get方法 加个随机数。
xmlhttpobj.send(null);
xmlhttpobj.onreadystatechange=function(){//客户端监控函数
if(xmlhttpobj.readystate==4){//服务器处理请求完成
if(xmlhttpobj.status==200){
//alert('ok');
var html = xmlhttpobj.responseText;//获得返回值
document.getElementById("subclass").innerHTML=html;
}else{
document.getElementById("subclass").innerHTML="对不起，您请求的页面有问题...";
}
}else{
document.getElementById("subclass").innerHTML="加载中，请梢候...";//服务器处理中
}
}
}
}
