Very practical ajax user registration module-JS Tutorial-php.cn

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The use of ajax technology in website design It is already very common, especially in interactive websites, ajax technology is even more indispensable. Ajax technology can be seen in almost all interactive website applications, large websites such as membership registration, small websites such as non-refresh Pagination technology gives website visitors a better user experience. In local website design, if there is an error in browsing a certain part, there is no need to refresh the entire web page. The most widely used part is the no-refresh verification of member registration, etc., no refresh Pagination, view more without refreshing, query whether the content in the database exists without refreshing, etc.

The following is the ajax user registration module. This ajax registration module is very practical. You only need to expand it according to your own needs. The check.php file is a query data file, just change the query content to your own. It should be easy to understand. You can download and verify it if necessary.

check.php

<?php
header("Content-Type:text/html;charset=gb2312");
@mysql_connect(&#39;localhost&#39;,&#39;root&#39;,&#39;ebaeba&#39;) or die("数据库服务器连接失败");
@mysql_select_db("test") or die("数据库不存在或不可用");



$uname = $_GET[&#39;userName&#39;];
//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



$sql="select * from t1 where name=&#39;".$uname."&#39;";
$query=mysql_query($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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reg.php

<%@page language="java" contentType="text/html;charset=gb2312"%>
<! 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="javascript" type="text/javascript">
<!--
//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(&#39;text/xml&#39;);
 　 }
 return request;
 } 
}
//全局XMLHTTP对象实例变量
var http = createXMLHTTP();
//发送请求
function chkUser()
{
 var url = "check.php"; //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><p id="showStr" style="background-color:#FF9900;display:none"></p></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><p id="passwordStr" style="background-color:#FF9900;display:none"></p></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><p id="confirmPasswordStr" style="background-color:#FF9900;display:none"></p></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><p id="emailStr" style="background-color:#FF9900;display:none"></p></td>
 </tr>
</table>
<p align="center"> 
 
　 <input type="button" name="ok" value=" 确定 " onClick="SubmitCheck()">
　 <input type="reset" name="reset" value=" 取消 ">
 </form>
</p>
</body>
</html>

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The above is what I compiled for everyone. I hope it will be useful to you in the future. Everyone is helpful.

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