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.
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CREATE TABLE IF NOT EXISTS `pic` (
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`id` int(11) NOT NULL AUTO_INCREMENT,
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`pic_name` varchar(60) NOT NULL,
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`pic_url` varchar(60) NOT NULL,
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`love` int(11) NOT NULL DEFAULT '0',
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PRIMARY KEY (`id`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8;
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CREATE TABLE IF NOT EXISTS `pic_ip` (
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`id` int(11) NOT NULL AUTO_INCREMENT,
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`pic_id` int(11) NOT NULL,
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`ip` varchar(40) NOT NULL,
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PRIMARY KEY (`id`)
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) 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:
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<!DOCTYPE HTML>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="keywords" content="jquery">
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<meta name="description" content="">
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<title>jQuery+Ajax+PHP实现"喜欢"评级</title>
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<link rel="stylesheet" type="text/css" href="../css/main.css" />
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<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
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<script type="text/javascript">
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$(function(){
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$("p a").click(function(){
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var love = $(this);
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var id = love.attr("rel");
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love.fadeOut(300);
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$.ajax({
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type:"POST",
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url:"love.php",
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data:"id="+id,
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cache:false,
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success:function(data){
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love.html(data);
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love.fadeIn(300);
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}
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});
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return false;
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});
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});
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</script>
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<style type="text/css">
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.clear{clear:both}
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.list{width:760px; margin:20px auto}
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.list li{float:left; width:360px; height:280px; margin:10px; position:relative}
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.list li p{position:absolute; top:0; left:0; width:360px; height:24px; line-height:24px; background:#000; opacity:.8;filter:alpha(opacity=80);}
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.list li p a{padding-left:30px; height:24px; background:url(images/heart.png) no-repeat 4px -1px;color:#fff; font-weight:bold; font-size:14px}
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.list li p a:hover{background-position:4px -25px;text-decoration:none}
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</style>
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</head>
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<body>
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<div id="main">
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<ul class="list">
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<?php
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include_once("connect.php");
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$sql = mysql_query("select * from pic");
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while($row=mysql_fetch_array($sql)){
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$pic_id = $row['id'];
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$pic_name = $row['pic_name'];
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$pic_url = $row['pic_url'];
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$love = $row['love'];
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?>
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<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 $love;?></a></p></li>
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<?php }?>
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</ul>
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</div>
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</body>
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</html>
CSS中,我们将定义鼠标滑向和离开红心按钮的动态效果,并定位按钮的位置,代码如下:
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.list{width:760px; margin:20px auto}
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.list li{float:left; width:360px; height:280px; margin:10px; position:relative}
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.list li p{position:absolute; top:0; left:0; width:360px; height:24px; line-height:24px;
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background:#000; opacity:.8;filter:alpha(opacity=80);}
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.list li p a{padding-left:30px; height:24px; background:url(images/heart.png) no-repeat
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4px -1px;color:#fff; font-weight:bold; font-size:14px}
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.list li p a:hover{background-position:4px -25px;text-decoration:none}
jQuery代码:当用户点击自己喜欢的图片上的红心按钮时,向后台love.php发送ajax请求,请求响应成功后,更新原有的数值,代码如下:
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$(function(){
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$("p a").click(function(){
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var love = $(this);
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var id = love.attr("rel");
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love.fadeOut(300);
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$.ajax({
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type:"POST",
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url:"love.php",
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data:"id="+id,
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cache:false,
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success:function(data){
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love.html(data);
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love.fadeIn(300);
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}
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});
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return false;
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});
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});
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:
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<?php
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$host="localhost";
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$db_user="root";
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$db_pass="";
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$db_name="demo";
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$timezone="Asia/Shanghai";
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$link=mysql_connect($host,$db_user,$db_pass);
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mysql_select_db($db_name,$link);
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mysql_query("SET names UTF8");
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?>
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<?php
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include_once("connect.php");
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$ip = get_client_ip();
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$id = $_POST['id'];
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if(!isset($id) || emptyempty($id)) exit;
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$ip_sql=mysql_query("select ip from pic_ip where pic_id='$id' and ip='$ip'");
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$count=mysql_num_rows($ip_sql);
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if($count==0){
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$sql = "update pic set love=love+1 where id='$id'";
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mysql_query( $sql);
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$sql_in = "insert into pic_ip (pic_id,ip) values ('$id','$ip')";
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mysql_query( $sql_in);
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$result = mysql_query("select love from pic where id='$id'");
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$row = mysql_fetch_array($result);
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$love = $row['love'];
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echo $love;
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}else{
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echo "喜欢过了..";
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}
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function get_client_ip() {
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if (getenv("HTTP_CLIENT_IP") && strcasecmp(getenv("HTTP_CLIENT_IP"), "unknown"))
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$ip = getenv("HTTP_CLIENT_IP");
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else
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if (getenv("HTTP_X_FORWARDED_FOR") && strcasecmp(getenv("HTTP_X_FORWARDED_FOR"), "unknown"))
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$ip = getenv("HTTP_X_FORWARDED_FOR");
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else
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if (getenv("REMOTE_ADDR") && strcasecmp(getenv("REMOTE_ADDR"), "unknown"))
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$ip = getenv("REMOTE_ADDR");
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else
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if (isset ($_SERVER['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))
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$ip = $_SERVER['REMOTE_ADDR'];
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else
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$ip = "unknown";
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return ($ip);
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}
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?>
代码中get_client_ip()函数是用来获取用户的真实IP.
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