一個強健實用的asp+ajax二級聯動菜單(有示範和附來源程式打包下載)

最後更新：2018-12-08 來源：互聯網

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一個強健實用的ajax二級聯動菜單(有示範和附來源程式打包下載)

前些天在搞背景時候要用到二級聯動的菜單,到網上去找了半天也沒找到滿意的,不是這錯就是那錯,在選擇的時候有時候不能返回.真是鬱悶.
後來就看到有人用ajax寫了無限級分類(牛,呵呵,本人看不懂.).就想到我那個後台不也可以用ajax試試,雖然比用javascript的慢點,但我這個實用.強健..不會出錯,也不會選擇某個大類後再返回無選擇狀態小類為空白的狀態.呵呵.
檔案目錄:
主要代碼如下:
index.asp 複製代碼代碼如下:<%@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的二級聯動by啊峰</title>
<script language="javascript" src="js.js"></script>
</head>
<body>
<h2><a href="http://yeahdown.com/">Ajax的二級聯動by啊峰</a></h2>

<%
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">選擇一級分類</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">選擇二級分類</option>
</select>
</div>
</form>
</body>
</html>

getsubcategory.asp檔案: 複製代碼代碼如下:<%
Response.Charset="GB2312" '設定字元集原預設為utf-8
bigclassid=safe(request.QueryString("bigclassid")) '非法字元過濾
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 "非法參數"
Response.End
End If%>

<%On error Resume Next
set p = conn.execute("select * from smallclass where bigclassid="&bigclassid&"")
If Err Then
Err.Clear
Response.Write "查詢出錯"
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>暫無小類</option></select>"
End If
p.Close
Set p = Nothing
Conn.Close
Set Conn = Nothing
Response.write html
html = ""
End If
%>

iconn.asp檔案: 複製代碼代碼如下:<%
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"">串連資料庫出錯</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
%>

最後一個js.js 複製代碼代碼如下:function createxmlhttp()
{
xmlhttpobj = false;
try{//建立對象，一個一個的試，哎，要是能統一標準都好。。
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>選擇二級分類</option></select>";
return;
};
var xmlhttpobj = createxmlhttp();
if(xmlhttpobj){//如果建立對象xmlhttpobj成功
xmlhttpobj.open('get',"getsubcategory.asp?bigclassid="+bigclassid+"&number="+Math.random(),true);//get方法加個隨機數。
xmlhttpobj.send(null);
xmlhttpobj.onreadystatechange=function(){//用戶端監控函數
if(xmlhttpobj.readystate==4){//伺服器處理請求完成
if(xmlhttpobj.status==200){
//alert('ok');
var html = xmlhttpobj.responseText;//獲得傳回值
document.getElementById("subclass").innerHTML=html;
}else{
document.getElementById("subclass").innerHTML="對不起，您請求的頁面有問題...";
}
}else{
document.getElementById("subclass").innerHTML="載入中，請梢候...";//伺服器處理中
}
}
}
}

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