PHP+Ajax detects whether a username or email already exists when registering. Ajax tutorial_PHP tutorial

PHP+Ajax detects whether an example tutorial already exists when registering by user name or email, ajax example tutorial

PHP+Ajax detecting whether the username or email already exists when registering is a common and important function in forums or membership systems. This article briefly describes the implementation method of this function in the form of examples. The specific steps are as follows:

1. PHP detection page

The check.php page code is as follows:

<script type="text/javascript" src="jiance.js"></script>
<form name="myform" action="" method="get">
 用户名：<input name="user" value="" type="text" onblur="funtest100()" />
 <div id="test100"></div>
</form>

2. Ajax verification page

The check.js page code is as follows:

var xmlHttp;
function S_xmlhttprequest(){
  if(window.ActiveXobject){
    xmlHttp = new ActiveXObject('Microsoft.XMLHTTP');
  }else if(window.XMLHttpRequest){
    xmlHttp = new XMLHttpRequest();
  }
}
function funtest100(){
  var f = document.getElementsByTagName_r('form')[0].user.value;//获取文本框内容
  S_xmlhttprequest();
  xmlHttp.open("GET","jcfor.php?id="+f,true);//找开请求
  xmlHttp.onreadystatechange = byphp;//准备就绪执行
  xmlHttp.send(null);//发送
}
function byphp(){
  //判断状态
  if(xmlHttp.readyState==1){//Ajax状态
    document.getElementByIdx_x_x('test100').innerHTML = "正在加载";
  }
  if(xmlHttp.readyState==4){//Ajax状态
    if(xmlHttp.status==200){//服务器端状态
      var bytest100 = xmlHttp.responseText;
      //alert(bytest100);
      document.getElementByIdx_x_x('test100').innerHTML = bytest100; 
    }  
  }
}

3. PHP verification page

chkfor.php page code is as follows:

<&#63;php
 if($_GET[id]){
    sleep(1);
    $conn=mysql_connect('localhost','root','');
    mysql_select_db('test',$conn);
    $sql="SELECT * FROM `user` WHERE `name`='$_GET[id]'";
    $q=mysql_query($sql);
 
    if(is_array(mysql_fetch_row($q))){
      echo "用户名已经存在"; 
    }else{
      echo "用户名可以使用"; 
    }
 }  
&#63;>

I hope the examples described in this article will be helpful to everyone in PHP program development.

That friend has PHP+AJAX code to verify username

Files include:

userreg.html (registration page)
ajaxreg .js (AJAX script and real-time verification JS script)
checkuserreg.php (connect to the database and check whether the user name has been Registration page)
userreg.html (Registration page) Copy PHP content to clipboard
PHP code:






xx.php
$username=$_POST['username'];
$sql="select * from user where username=$username";
$handle=mysql_query($sql);
$num=mysql_num_rows($handle);
if($num>0){
$flag=1;
}else{
$flag=0;
}
exit($flag);

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