PHP Ajax User Registration detection code

Last Update:2017-02-28 Source: Internet

Author: User

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In fact, as long as the implementation of a simple Ajax detection user name, the normal point to be divided into three files. I have a simple point here:

The first one: index. PHP
<! DOCTYPE HTML PUBLIC "-//W3C//DTD XHTML 1.0 transitional//en" "http://www.hake.cc/TR/xhtml1/DTD/ Xhtml1-transitional.dtd ">
<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 "/>
<title> Untitled Document </title>
<script language= "javascript" src=http://www.phpzy.com/phpjichu/"Ajax.js" ></script>

<body>
<table align= "center"
<tr>
     <td width= "25%" class = "ALTBG1" > Username <font color= "Red" >*</FONT>
    <input size= "name=" id = "username" type= "text" value= "onblur=" Startrequest (document.getElementById (' username '). value); "/>       <br/></td>
               <td></td>
                           <td id= "Ckuser" ></td>
</tr>
</table>
</body>
The second to use Js:ajax.js
[php ]

var xmlHttp;
function Createxmlhttprequest ()
{
if (window. XMLHttpRequest)
{
XmlHttp = new XMLHttpRequest ();//mozilla browser
}
else if (window. ActiveXObject)
{
Try
{
XmlHttp = new Activex0bject ("Msxml2.xmlhttp");//ie old version
}
catch (E)
{}
Try
{
XmlHttp = new ActiveXObject ("Microsoft.XMLHTTP");
}
catch (E)
{}
if (!xmlhttp)
{
Window.alert ("Cannot create XMLHttpRequest object instance");
return false;
}
}
}

function Startrequest (username)
{
Createxmlhttprequest ()//Special series

Xmlhttp.open ("Get", "ckuser.php?name=" +username,true);
Xmlhttp.onreadystatechange = Handlestatechange;
Xmlhttp.send (NULL);
}

[/php]

The third file is the PHP file: ckuser.php
<?php
        require_once ("conn.php");
   $username = $_get["name"];
        $query = "SELECT id from user where username= '". $username. "';";
        $res =mysql_query ($query);
                if (mysql_num_ Rows ($res)!=0)
                {
             echo "true";
               }else
                        {
                            echo "false";
                        }

?>
The last one is the database link file conn.php

<?php
$conn =mysql_connect ("localhost", "root", "l1314520") or Die ("Database Server connection Error". Mysql_error ());
mysql_select_db ("Test", $conn) or Die ("Database access Error". Mysql_error ());
mysql_query ("Set character set gb2312");
mysql_query ("Set names gb2312");
?>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

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PHP Ajax User Registration detection code

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