php+jquery ajax邮箱地址无刷新验证实例

要实现无刷新页面我们一般会用到ajax来实现，以前是使用最原始的js ajax验证现在常用的jquery ajax了只要简单的一句post即可解决了，下面我们看实例

<script>ec(2);</script>

index.php页面

代码如下

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<script><br /> $(document).ready(function(){<br /> $('#username').keyup(username_check);<br /> });<br /> <br /> function username_check(){ <br /> var username = $('#username').val();<br /> if(username == "" || username.length < 4){<br /> $('#username').css('border', '3px #CCC solid');<br /> $('#tick').hide();<br /> }else{</script> jQuery.ajax({    type: "POST",    url: "check.php",    data: 'username='+ username,    cache: false,    success: function(response){ if(response == 1){  //不可以注册  $('#username').css('border', '3px #C33 solid');   $('#tick').hide();  $('#cross').fadeIn();  }else{  $('#username').css('border', '3px #090 solid');  $('#cross').hide();  $('#tick').fadeIn();       } } }); }   } #tick{display:none} #cross{display:none}   Username:

php验证页面，此页面接收到jquery ajax post过来的数据进行验证并返回值

代码如下

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# FileName="Connection_php_mysql.htm" # Type="MYSQL" # HTTP="true" $hostname_lr = "localhost"; $database_lr = "ordersiliconebracelets"; $username_lr = "root"; $password_lr = ""; $lr = mysql_pconnect($hostname_lr, $username_lr, $password_lr) or trigger_error(mysql_error(),E_USER_ERROR); mysql_query("set names utf8;"); //if ($lr) { //echo "非常好,MYSQL连接成功了!"; //} else { //echo "不好意思,失败了！"; //} mysql_select_db($database_lr, $lr); // $username = trim(strtolower($_POST['username'])); $username = mysql_escape_string($username); if (eregi("^[_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3}$",$username)) {  //email通过检查  $query = "SELECT email FROM user WHERE email = '$username' LIMIT 1";  $result = mysql_query( $query );  $num = mysql_num_rows($result);    echo $num; } else { echo "1";//不能注册 } ?>