PHP+Ajax检测用户名或邮件注册时是否已经存在实例教程_php技巧

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Release: 2016-05-16 20:36:59
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PHP+Ajax检测用户名或邮件注册时是否已经存在是论坛或会员系统中常见的一个重要功能。本文就以实例形式简单描述这一功能的实现方法。具体步骤如下:

一、PHP检测页面

check.php页面代码如下:

<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>

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二、Ajax验证页面

check.js页面代码如下:

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&#63;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; 
    }  
  }
}

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三、PHP验证页面

chkfor.php页面代码如下:

<&#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;>

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希望本文所述实例对大家PHP程序开发有所帮助。

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