我可以在這個php/javascript投票代碼上獲得一些幫助嗎？

Question

這是這個問題的延續： Move div based on user voting

我先貼了一個問題，一個未註冊的用戶，再後來註冊的，所以我不能編輯或添加到我原來的問題...

賈斯汀約翰遜真的幫我解決了代碼問題，但是我仍然遇到了一個問題，試圖找出如何整合vote.php頁面。

我不希望在這裏重複提問，我希望有人會看到這個，看看上面的問題（我在「進一步下去」中添加了更多內容，並且1）幫助我解決問題，並且2）賈斯汀的工作 - 因爲我不能再做了，因爲註冊的事情...

謝謝！ 喬爾

Answer 1

的MySQL：

CREATE TABLE song (
    song_id INT UNSIGNED NOT NULL AUTO_INCREMENT, 
    vote INT NOT NULL DEFAULT 0, 
    PRIMARY KEY(song_id) 
); 

的JavaScript：

$(function() { 
    var listContainer = $("#daily-songs"), 
     songs   = []; 
    var songSort = function(a, b) { 
     return +b.vote.text() - +a.vote.text(); 
    }; 

    var submitVote = function(song, delta) { 
     $.post("vote.php", 
      { 
       id: song.node.attr("id").match(/\d+$/)[0], 
       delta: delta, 
      }, 
      function(data) { 
       if (data != 'success') { alert(data); } 
      } 
     ); 

     $.each(songs.sort(songSort), function() { 
      listContainer.append(this.node); 
     }); 
    }; 

    listContainer.find("li").each(function() { 
     var $this = $(this); 
     var song = { 
      node: $this, 
      vote: $this.find(".votes") 
     }; 
     $this.find(".vote-up").click(function() { 
      submitVote(song, 1); 
     }); 
     $this.find(".vote-down").click(function() { 
      submitVote(song, -1); 
     }); 

     songs.push(song); 
    }); 
}); 

PHP：

<?php 

$song_id = !empty($_POST['id']) ? (int)$_POST['id'] : 0; 
$delta = !empty($_POST['delta']) ? (int)$_POST['delta'] : 0; 

if (!$song_id || !$delta || !is_int($song_id) || !is_int($delta)) { 
    die("Invalid parameters"); 
} 

// Make sure the voting value is within the valid range. 
if ($delta != -1 && $delta != 1) { 
    exit("Invalid delta"); 
} 


// Check to see if user has already voted for this song 
session_start(); 
if (isset($_SESSION['voted'])) { 
    exit("You already voted!"); 
} 

// If they haven't voted yet, connect to the database 
// YOU NEED TO CHANGE THIS INFOMATION TO WHATEVER APPLYS TO YOU. 
$dsn = 'mysql:dbname=testdb;host=127.0.0.1'; 
$user = 'dbuser'; 
$password = 'dbpass'; 

try { 
    $dbh = new PDO($dsn, $user, $password); 
} 
catch (PDOException $e) { 
    exit('Connection failed: ' . $e->getMessage()); 
} 


// If the database connection is succesful, update song entry 
// UPDATE daily_song SET votes=votes+$delta WHERE daily_song_id=$songId 
$sth = $dbh->prepare('UPDATE song SET votes = votes + :delta WHERE song_id = :song_id'); 
$sth->bindParam(':delta', $delta); 
$sth->bindParam(':song_id', $song_id); 
if (!$sth->execute()) { 
    exit("Unable to update votes"); 
} 

exit("success");