jQuery+Ajax+PHP實現(xiàn)“喜歡”評級功能代碼

2024-05-04 21:48:32

字體：大中小

供稿：網(wǎng)友

本文章來給大家介紹一個jQuery+Ajax+PHP實現(xiàn)“喜歡”評級功能代碼,用戶點擊頁面中自己喜歡的圖片上的紅心按鈕時，前端頁面向后臺發(fā)送一個ajax請求,后臺PHP程序接收請求后，查詢IP庫中是否已經(jīng)有該用戶的點擊記錄,如果沒有,則將對應(yīng)的數(shù)值+1,同時將該用戶IP信息寫入IP庫,反之則告訴用戶已經(jīng)“喜歡過了”.

數(shù)據(jù)庫設(shè)計:先準備兩張表,pic表保存的是圖片信息,包括圖片對應(yīng)的名稱、路徑以及圖片“喜歡”總數(shù),pic_ip則記錄用戶點擊喜歡后的IP數(shù)據(jù).

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 '0',

  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,我們通過PHP讀取pic表中的圖片信息并展示出來,結(jié)合CSS，提升頁面展示效果,代碼如下:

<!DOCTYPE HTML>

<html>

<head>

<meta charset="utf-8">

<meta name="keywords" content="jquery">

<meta name="description" content="">

<title>jQuery+Ajax+PHP實現(xiàn)"喜歡"評級</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(images/heart.png) 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['id'];

$pic_name = $row['pic_name'];

$pic_url = $row['pic_url'];

$love = $row['love'];

?>

<li><img src="images/<?php echo $pic_url;?>" alt="<?php echo $pic_name;?>"><p><a href="#" title="我喜歡" class="img_on" rel="<?php echo $pic_id;?>"><?php echo $love;?></a></p></li>

<?php }?>

</ul>

//開源代碼Vevb.com

</div>

</body>

</html>

CSS中,我們將定義鼠標滑向和離開紅心按鈕的動態(tài)效果,并定位按鈕的位置,代碼如下:

.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(images/heart.png) 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代碼:當(dāng)用戶點擊自己喜歡的圖片上的紅心按鈕時,向后臺love.php發(fā)送ajax請求,請求響應(yīng)成功后,更新原有的數(shù)值,代碼如下:

$(function(){

    $("p a").click(function(){

        var love = $(this);

        var id = love.attr("rel"); //對應(yīng)id

        love.fadeOut(300); //漸隱效果

        $.ajax({

            type:"POST",

            url:"love.php",

            data:"id="+id,

            cache:false, //不緩存此頁面

            success:function(data){

                love.html(data);

                love.fadeIn(300); //漸顯效果

            }

        });

        return false;

    });

});

love.php:后臺love.php接收前端的ajax請求，根據(jù)提交的圖片id值,查找IP表中是否已有該用戶ip的點擊記錄,如果有則告訴用戶已“喜歡過了”,反之,則進行一下操作.

1、更新圖片表中對應(yīng)的圖片love字段值,將數(shù)值加1.

2、將該用戶IP信息寫入到pic_ip表中,用以防止用戶重復(fù)點擊.

3、獲取更新后的love值,即喜歡該圖片的用戶總數(shù),并將該總數(shù)輸出給前端頁面,代碼如下:

<?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");

//開源代碼Vevb.com

$ip = get_client_ip();

$id = $_POST['id'];

if(!isset($id) || emptyempty($id)) exit;

$ip_sql=mysql_query("select ip from pic_ip where pic_id='$id' and ip='$ip'");

$count=mysql_num_rows($ip_sql);

if($count==0){

$sql = "update pic set love=love+1 where id='$id'";

mysql_query( $sql);

$sql_in = "insert into pic_ip (pic_id,ip) values ('$id','$ip')";

mysql_query( $sql_in);

$result = mysql_query("select love from pic where id='$id'");

$row = mysql_fetch_array($result);

$love = $row['love'];

echo $love;

}else{

echo "喜歡過了..";

}

//獲取用戶真實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['REMOTE_ADDR']) && $_SERVER['REMOTE_ADDR'] && strcasecmp($_SERVER['REMOTE_ADDR'], "unknown"))

$ip = $_SERVER['REMOTE_ADDR'];

else

$ip = "unknown";

return ($ip);

}

?>