用户注册演示程序 <! doctype html public "- w3c dtd html 4 0 en" "http: www w3 org tr rec-html140 strict dtd"> <html> <head> <meta http-equiv="content-type" content="text html; charset=gb2312"> <title>ajax用户注册演示程序< title> <script language="网页特效" type="text 网页特效"> <!-- 创建函数 function createxmlhttp() { var request; var browser = navigator appname
用户注册演示程序
<! doctype html public "-//w3c//dtd html 4.0//en"
"http://www.w3.org/tr/rec-html140/strict.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>ajax用户注册演示程序</title>
<script language="网页特效" type="text/网页特效">
<!--
//创建函数
function createxmlhttp() 
{
  var request;
  var browser = navigator.appname;
  //使用ie,则使用xmlhttp对象
  if(browser == "microsoft internet explorer") 
  {
    var arrversions = ["microsoft.xmlhttp", "msxml2.xmlhttp.4.0",
      "msxml2.xmlhttp.3.0", "msxml2.xmlhttp","msxml2.xmlhttp.5.0"];
    for (var i=0; i < arrversions.length; i++) 
    {
      try 
      {
 //从中找到一个支持的版本并建立xmlhttp对象
        request = new activexobject(arrversions[i]); 
        return request;
      } 
      catch (exception)
      {
        //忽略,继续
      }
    }
  }
  else
  {
    //否则返回一个xmlhttprequest对象
    request = new xmlhttprequest(); 
    if(request.overridemimetype)
    {
    request.overridemimetype('text/xml');
   }
    return request;
  }   
}
//全局xmlhttp对象实例变量
var http = createxmlhttp();
//发送请求
function chkuser()
{
  var url = "check.php教程";    //请求"checkusername" servlet
  var name = document.getelementbyid("username").value;   
  url += ("?username="+escape(name)+"&oprate=chkuser");
  http.open("get",url,true);
  http.onreadystatechange = processhttpresponse;
  http.send(null);
  return ;
}
//处理响应
function processhttpresponse()
{
  if(http.readystate == 4)
  {
    if(http.status == 200)
    {
     var xmldocument = http.responsexml;
     if(http.responsetext!="该用户名有效,可以使用!")
      {
 //返回的信息动态显示
      document.getelementbyid("showstr").style.display = "";
      document.getelementbyid("username").style.background= "#ff0000";
      document.getelementbyid("showstr").innertext = http.responsetext;
     }
      else
      {
      document.getelementbyid("username").style.background= "#ffffff";
      document.getelementbyid("showstr").style.display = "";
        document.getelementbyid("showstr").innertext = http.responsetext;
     }
    }
    else
    {
    alert("你所请求的页面发生异常,可能会影响你浏览该页的信息!");
    alert(http.status);
    }
  }
}
//检验输入密码
function chkpassword()
{
  var m=document.form1;
  if(m.password.value.length>20 || m.password.value.length<6 )
  {
    document.getelementbyid("passwordstr").style.display = "";
   document.getelementbyid("password").style.background= "#ff0000";
   document.getelementbyid("passwordstr").innertext = "对不起,密码必须为英文字母、数字或下划线,长度为6~20!";
   }
   else
   {
    document.getelementbyid("password").style.background= "#ffffff";
    document.getelementbyid("passwordstr").style.display = "none";
   }
}
//验证两次密码是否一致
function chkconfirmpassword()
{
   var m=document.form1;
  if (m.password.value != m.confirmpassword.value)
  {
   document.getelementbyid("confirmpasswordstr").style.display = "";
   document.getelementbyid("confirmpassword").style.background= "#ff0000";
   document.getelementbyid("confirmpasswordstr").innertext = "对不起,密码与重复密码不一致!";
  }
  else
  {
   document.getelementbyid("confirmpassword").style.background= "#ffffff";
   document.getelementbyid("confirmpasswordstr").style.display = "none";
  }
} 
//验证email是否有效
function chkemail()
{
   var m=document.form1;
   var email = m.email.value;  
   //正则表达式
  var regex = /^([a-za-z0-9_-])+@([a-za-z0-9_-])+(.[a-za-z0-9_-])+/;    
  var flag = regex.test(email);         
  if(!flag)    
  {
     document.getelementbyid("emailstr").style.display = "";
   document.getelementbyid("email").style.background= "#ff0000";
   document.getelementbyid("emailstr").innertext = "对不起,邮箱地址无效!";  
  }    
  else    
  { 
     document.getelementbyid("email").style.background= "#ffffff";
   document.getelementbyid("emailstr").style.display = "none";  
  }
   
}
//提交检查函数 
function submitcheck()
{
  var m=document.form1; 
  if(m.username.value.length==0)
  {
   alert("对不起,用户名必须为英文字母、数字或下划线,长度为5~20。");
   m.username.focus();
   return false;
  }
  if(m.password.value.length==0)
  {
   alert("对不起,密码必须为英文字母、数字或下划线,长度为5~20。");
   m.password.focus();
   return false;
  }
  if (m.password.value != m.confirmpassword.value)
  {
   alert("对不起,密码与重复密码不一致!");
   m.confirmpassword.focus();
   return false;
  } 
  if(m.email.value.length==0)
  {
   alert("对不起,邮箱地址不能为空!!");
   m.email.focus();
   return false; 
  }
  m.submit();
}
//--> 
</script>
<body >
<form name="form1" method="post" action="register.php">
<h3 align="center">ajax用户注册程序</h3>
<table align="center" width="500" border="1" >
  <tr>
    <td><font color="red">*</font></td>
    <td width="100">用户帐号:</td>
    <td><input type="text" name="username" maxlength="20" style="background=#ffffff" onblur="chkuser()"></td>
    <td><div id="showstr" style="background-color:#ff9900;display:none"></div></td>
  </tr>
  <tr>
    <td><font color="red">*</font></td>
    <td>用户密码:</td>
    <td align="left"><input type="password" name="password" maxlength="22" style="background=#ffffff" onblur="chkpassword()"/> </td>
    <td><div id="passwordstr" style="background-color:#ff9900;display:none"></div></td>
  </tr>
  <tr>
    <td><font color="red">*</font></td>
    <td>确认密码:</td>
    <td><input type="password" name="confirmpassword" maxlength="20" style="background=#ffffff" onblur="chkconfirmpassword()"/></td>
    <td><div id="confirmpasswordstr" style="background-color:#ff9900;display:none"></div></td>
  </tr>
  <tr>
    <td><font color="red">*</font></td>
    <td>email:</td>
    <td><input type="text" name="email" maxlength="100"  style="background=#ffffff" onblur="chkemail()"></td>
    <td><div id="emailstr" style="background-color:#ff9900;display:none"></div></td>
  </tr>
</table>
<div align="center"> 
  
   <input type="button" name="ok" value=" 确定 " onclick="submitcheck()">
   <input type="reset" name="reset" value=" 取消 ">
  </form>
</div>
</body>
</html>reg.php检测程序
<?php
header("content-type:text/html;charset=gb2312");
@mysql教程_connect('localhost','root','ebaeba') or die("数据库教程服务器连接失败");
@mysql_select_db("test") or die("数据库不存在或不可用");
 
$uname = $_get['username'];
//下面进行数据库查询  查找是不是有这一个用户
//如果没有查找到这个用户名
 
$sql="select * from t1 where name='".$uname."'";
$query=mysql_query($sql);
$row=mysql_fetch_object($query);
if(strlen($uname)<6||strlen($uname)>20)
{
   $msg="用户名必须是6至20个字符.";
}
else
{
 
   if($row==false)
   {
      $msg="该用户名有效,可以使用!";
   }
   else
   {
      $msg="对不起,此用户名已经存在,请更换用户名注册!";
   }
}
echo $msg ;
?>


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