ASP判断学号是否存在

 js代码（同页） 

 

< script language = javascript >
function  check_user(form) ... {
u_no=form.s_no.value;
if (u_no==null||u_no=='')...{
alert("请您输入学号");
return false;
}
infoBoard=document.getElementById("checkInfo");
infoBoard.innerText='查询中...';
myurl="http://192.168.1.6/stu/admin/cuno.asp?u_no="+u_no;
retCode=openUrl(myurl);
switch(retCode)...{
case "-2":
infoBoard.innerHTML='抱歉,查询失败';break;
case "1":
infoBoard.innerHTML=''+u_no+'可以使用';break;
case "0":
infoBoard.innerHTML='抱歉，学号'+u_no+'已经被使用';
}
return;
}

function  openUrl(url) ... {
var objxml=new ActiveXObject("Microsoft.XMLHttp")
objxml.open("GET",url,false);
objxml.send();
retInfo=objxml.responseText;
if (objxml.status=="200")...{
return retInfo;
}
else...{
return "-2";
}
}
script >

 

文本框代码（同页）

 

< input  type ="text"  name ="s_no"  size ="20"  onblur ="check_user(this.form);" >< span  id ="checkInfo" > span >

 

判断页（cuno.asp）

 

< ! -- #include file = " ../include/conn.asp " -->  
< % 
u_no = request.querystring( " u_no " ) 
Set  rs  =  Server.CreateObject ( " ADODB.Recordset " ) 
sql  =   " Select * from stubasic where s_no=' " & u_no & " ' "  
rs.Open sql,conn, 1 , 1  
if  rs.eof  and  rs.bof  then  
Response.write  " 1 "
else  
Response.write  " 0 "
end   if  
rs.close 
set  rs = nothing  
% >