一个强健实用的asp+ajax二级联动菜单(有演示和附源程序打包下载)


答案：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
[复制此代码]CODE:

<%@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=><!--#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: 
[复制此代码]CODE:

<% 
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:  
[复制此代码]CODE:

<% 
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  
[复制此代码]CODE:

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?bi
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一个强健 实用的asp+ajax二级联动菜单(有演示和附源程序打包下载)

一个强健实用的asp+ajax二级联动菜单(有演示和附源程序打包下载)
