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php+ajax registration real-time verification function

高洛峰Original: 2016-12-23 17:35:561363browse

ajax’s real-time verification technology is already very mature. On some standardized websites, if there is a template for registration verification, it will definitely involve ajax’s non-refresh verification. This is great in the user registration experience. Compared with one that cannot The verification mode that connects to the background without refreshing in real time requires going back to refresh, which is very unfriendly to the user experience.

The ajax model is a requirement for almost all site applications. As a front-end non-refresh verification, ajax can be used in combination with all back-end languages, such as asp+ajax, php+ajax, .net+ajax, etc., which are mainly explained here It is the registration verification of php+ajax.

The following verification is a complete example. When we register on the website, when entering the user name, we must first perform a non-refresh verification to verify whether there is data with the same name in the background database. If it exists, there will be no refresh display. A prompt that the username has been occupied. A total of four files are involved here.

ajax.js: The core file of ajax technology. It is mainly used to display verification prompts from time to time. This file usually does not need to be modified, and only needs to be called by the front end.

var xmlHttp
function showHint(str)
{
if (str.length==0)
 { 
 document.getElementById("txtHint").innerHTML=""
 return
 }
xmlHttp=GetXmlHttpObject()
if (xmlHttp==null)
 {
 alert ("Browser does not support HTTP Request")
 return
 } 
xmlHttp.onreadystatechange=stateChanged 
 
var geturl="conn.php?q="+str
//sid是增加一个随机数 防止页面启用缓存技术·
geturl=geturl+"&sid="+Math.random()
geturl=encodeURI(geturl);
geturl=encodeURI(geturl); 
xmlHttp.open("GET",geturl,true)
xmlHttp.send(null)
} 
function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 { 
 document.getElementById("txtHint").innerHTML=xmlHttp.responseText 
 } 
}
function GetXmlHttpObject()
{
var xmlHttp=null;
try
 {
 // Firefox, Opera 8.0+, Safari
 xmlHttp=new XMLHttpRequest();
 }
catch (e)
 {
 // Internet Explorer
 try
 {
 xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
 }
 catch (e)
 {
 xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
 }
 }
return xmlHttp;
}

conn.php: This is the configuration file of the website. To configure your local mysql username and password, you need to configure the connection between PHP and the database. You can refer to the article on PHP+MYSQL database connection. In addition, you need to process the received data. Perform real-time display. If there are multiple documents to be verified, just perform multiple acceptance and verification here.

<?php
$q=$_GET["q"];
$q = urldecode($q);
 
if (strlen($q) > 0)
{
 $conn = @mysql_connect("localhost","root","1010") or die ("MySql连接错误");
 mysql_select_db("xin",$conn);
 mysql_query("set names &#39;utf8&#39;");
  
 $sql = "SELECT username FROM message WHERE username = &#39;$q&#39;";
 $query = mysql_query($sql);
 @$row = mysql_fetch_array($query);
  
 if(!empty($row[&#39;username&#39;]))
 {
 $response = "<font color=red>已经被注册！</font>";
 }else
 {
 $response = "<font color=blue>恭喜！可以注册！</font>";
 }
  
 echo $response;
}
 
?>

index.html: This is the front-end file. This file is relatively simpler. It calls the ajax.js processing file and submits the file to be submitted for non-refresh verification to conn.php and the background for connection.

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<script src="ajax.js"></script> 
</head>
<body bgcolor="#999999">
<center>
<form> 
<table>
 <tr>
 <td>用户名：</td>
 <td><input type="text" id="txt1" onKeyUp="showHint(this.value)"></td>
 </tr>
 <tr align="center">
 <td colspan="2"><span id="txtHint"></span></td>
 </tr>
</table>
</form>
</center>
</body>
</html>

Library.txt: This is the SQL database file. Just import this file into the mysql database.

DROP DATABASE IF EXISTS `xin`;
CREATE DATABASE `xin` /*!40100 DEFAULT CHARACTER SET utf8 */;
USE `xin`;
 
 
CREATE TABLE `message` (
 `id` int(11) NOT NULL auto_increment,
 `username` varchar(20) default NULL,
 PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

Save these files in the root directory where PHP files can be run. The test URL is localhost/index.html. The following is the complete set of files packaged and downloaded. Try to modify it to the registration module you need, such as adding Password, name, etc.

The above is the entire content of this article. I hope it will be helpful to everyone’s learning. I also hope that everyone will support the PHP Chinese website.

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