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jQuery+Ajax+PHP实现“喜欢”评级功能代码

WBOYOriginal: 2016-05-25 16:39:491136browse

本文章来给大家介绍一个jQuery+Ajax+PHP实现"喜欢"评级功能代码,用户点击页面中自己喜欢的图片上的红心按钮时，前端页面向后台发送一个ajax请求,后台PHP程序接收请求后，查询IP库中是否已经有该用户的点击记录,如果没有,则将对应的数值+1,同时将该用户IP信息写入IP库,反之则告诉用户已经"喜欢过了".

数据库设计:先准备两张表,pic表保存的是图片信息,包括图片对应的名称、路径以及图片"喜欢"总数,pic_ip则记录用户点击喜欢后的IP数据.

CREATE TABLE IF NOT EXISTS `pic` (  
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  `pic_name` varchar(60) NOT NULL,  
  `pic_url` varchar(60) NOT NULL,  
  `love` int(11) NOT NULL DEFAULT &#39;0&#39;,  
  PRIMARY KEY (`id`)  
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;  
 
CREATE TABLE IF NOT EXISTS `pic_ip` (  
  `id` int(11) NOT NULL AUTO_INCREMENT,  
  `pic_id` int(11) NOT NULL,  
  `ip` varchar(40) NOT NULL,  
  PRIMARY KEY (`id`)  
) ENGINE=MyISAM  DEFAULT CHARSET=utf8

index.php:在index.php中,我们通过PHP读取pic表中的图片信息并展示出来,结合CSS，提升页面展示效果,代码如下:

<!DOCTYPE HTML> 
<html> 
<head> 
<meta charset="utf-8"> 
<meta name="keywords" content="jquery"> 
<meta name="description" content=""> 
<title>jQuery+Ajax+PHP实现"喜欢"评级</title> 
<link rel="stylesheet" type="text/css" href="../css/main.css" /> 
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script> 
<script type="text/javascript"> 
$(function () {
    $("p a").click(function () {
        var love = $(this);
        var id = love.attr("rel");
        love.fadeOut(300);
        $.ajax({
            type : "POST",
            url : "love.php",
            data : "id=" + id,
            cache : false,
            success : function (data) {
                love.html(data);
                love.fadeIn(300);
            }
        });
        return false;
    });
});
</script> 
<style type="text/css"> 
.clear{clear:both} 
.list{width:760px; margin:20px auto} 
.list li{float:left; width:360px; height:280px; margin:10px; position:relative} 
.list li p{position:absolute; top:0; left:0; width:360px; height:24px; line-height:24px; background:#000; opacity:.8;filter:alpha(opacity=80);} 
.list li p a{padding-left:30px; height:24px; background:url(http://pic1.phprm.com/2014/08/27/heart.jpg) no-repeat 4px -1px;color:#fff; font-weight:bold; font-size:14px} 
.list li p a:hover{background-position:4px -25px;text-decoration:none} 
</style> 
</head> 
 
<body> 
 
<div id="main"> 
 
<ul class="list"> 
<?php 
include_once("connect.php"); 
$sql = mysql_query("select * from pic"); 
while($row=mysql_fetch_array($sql)){ 
$pic_id = $row[&#39;id&#39;]; 
$pic_name = $row[&#39;pic_name&#39;]; 
$pic_url = $row[&#39;pic_url&#39;]; 
$love = $row[&#39;love&#39;]; 
 
<li><img src="images/<?php echo $pic_url;" alt="<?php echo $pic_name;"><p><a href="#" title="我喜欢" class="img_on" rel="<?php echo $pic_id;"><?php echo $love;</a></p></li> 
<?php } 
</ul> 
</div> 
 
</body> 
</html>

CSS中,我们将定义鼠标滑向和离开红心按钮的动态效果,并定位按钮的位置,代码如下:

.list{width:760px; margin:20px auto}  
.list li{float:left; width:360px; height:280px; margin:10px; position:relative}  
.list li p{position:absolute; top:0; left:0; width:360px; height:24px; line-height:24px;   
background:#000; opacity:.8;filter:alpha(opacity=80);}  
.list li p a{padding-left:30px; height:24px; background:url(http://pic1.phprm.com/2014/08/27/heart.jpg) no-repeat   
4px -1px;color:#fff; font-weight:bold; font-size:14px}  
.list li p a:hover{background-position:4px -25px;text-decoration:none}

jQuery代码:当用户点击自己喜欢的图片上的红心按钮时,向后台love.php发送ajax请求,请求响应成功后,更新原有的数值,代码如下:

$(function(){  
    $("p a").click(function(){  
        var love = $(this);  
        var id = love.attr("rel"); //对应id  
        love.fadeOut(300); //渐隐效果  
        $.ajax({  
            type:"POST",  
            url:"love.php",  
            data:"id="+id,  
            cache:false, //不缓存此页面  
            success:function(data){  
                love.html(data);  
                love.fadeIn(300); //渐显效果  
            }  
        });  
        return false;  
    });  
});

love.php:后台love.php接收前端的ajax请求，根据提交的图片id值,查找IP表中是否已有该用户ip的点击记录,如果有则告诉用户已"喜欢过了",反之,则进行一下操作.

1、更新图片表中对应的图片love字段值,将数值加1.

2、将该用户IP信息写入到pic_ip表中,用以防止用户重复点击.

3、获取更新后的love值,即喜欢该图片的用户总数,并将该总数输出给前端页面,代码如下:

<?php 
$host="localhost"; 
$db_user="root"; 
$db_pass=""; 
$db_name="demo"; 
$timezone="Asia/Shanghai"; 
 
$link=mysql_connect($host,$db_user,$db_pass); 
mysql_select_db($db_name,$link); 
mysql_query("SET names UTF8"); 
?>

<?php 
include_once("connect.php"); 
$ip = get_client_ip(); 
$id = $_POST[&#39;id&#39;]; 
if(!isset($id) || emptyempty($id)) exit; 
 
$ip_sql=mysql_query("select ip from pic_ip where pic_id=&#39;$id&#39; and ip=&#39;$ip&#39;"); 
$count=mysql_num_rows($ip_sql); 
if($count==0){ 
$sql = "update pic set love=love+1 where id=&#39;$id&#39;"; 
mysql_query( $sql); 
$sql_in = "insert into pic_ip (pic_id,ip) values (&#39;$id&#39;,&#39;$ip&#39;)"; 
mysql_query( $sql_in); 
$result = mysql_query("select love from pic where id=&#39;$id&#39;"); 
$row = mysql_fetch_array($result); 
$love = $row[&#39;love&#39;]; 
echo $love; 
}else{ 
echo "喜欢过了.."; 
} 
//获取用户真实IP 
function get_client_ip() { 
if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown")) 
$ip = getenv("HTTP_CLIENT_IP"); 
else 
if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown")) 
$ip = getenv("HTTP_X_FORWARDED_FOR"); 
else 
if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown")) 
$ip = getenv("REMOTE_ADDR"); 
else 
if (isset ($_SERVER[&#39;REMOTE_ADDR&#39;]) && $_SERVER[&#39;REMOTE_ADDR&#39;] && strcasecmp($_SERVER[&#39;REMOTE_ADDR&#39;], "unknown")) 
$ip = $_SERVER[&#39;REMOTE_ADDR&#39;]; 
else 
$ip = "unknown"; 
return ($ip); 
} 
?>

代码中get_client_ip()函数是用来获取用户的真实IP.

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