Chciałbym ograniczyć możliwość głosowania do jednego. Teraz skrypt działa tak, że głosować można bez końca.
glosowanie.php
<?php
session_start();
ob_start();
require_once('connect.php');
require_once('functions.php');
?>
<?php
function getAllVotes($id)
{
/**
Returns an array whose first element is votes_up and the second one is votes_down
**/
$votes = array();
$q = "SELECT * FROM shity WHERE id = $id";
$r = mysql_query($q);
if(mysql_num_rows($r)==1)//id found in the table
{
$row = mysql_fetch_assoc($r);
$votes[0] = $row['votes_up'];
$votes[1] = $row['votes_down'];
}
return $votes;
}
function getEffectiveVotes($id)
{
/**
Returns an integer
**/
$votes = getAllVotes($id);
$effectiveVote = $votes[0] - $votes[1];
return $effectiveVote;
}
$id = $_POST['id'];
$action = $_POST['action'];
//get the current votes
$cur_votes = getAllVotes($id);
//ok, now update the votes
if (isset($_SESSION['user_id']) and isset($_SESSION['login'])){
if($action=='vote_up') //voting up
{
$votes_up = $cur_votes[0]+1;
$q = "UPDATE shity SET votes_up = $votes_up WHERE id = $id";
}
elseif($action=='vote_down') //voting down
{
$votes_down = $cur_votes[1]+1;
$q = "UPDATE shity SET votes_down = $votes_down WHERE id = $id";
}
}
$r = mysql_query($q);
if($r) //voting done
{
$effectiveVote = getEffectiveVotes($id);
echo $effectiveVote." votes";
}
elseif(!$r) //voting failed
{
echo "Zaloguj się!";
}
?>
index.php
<?php
session_start();
ob_start();
require_once('connect.php');
require_once('functions.php');
?>
<html>
<head>
<title>Votes</title>
<style type='text/css'>
.entry {
width: 710px;
background: #ffffff;
padding:8px;
border:1px solid #bbbbbb;
margin:5px auto;
-moz-border-radius:8px;
}
span.link a {
font-size:150%;
color: #000000;
text-decoration:none;
}
a.vote_up, a.vote_down {
display:inline-block;
background-repeat:none;
background-position:center;
height:16px;
width:16px;
margin-left:4px;
text-indent:-900%;
}
a.vote_up {
background:url("images/thumb_up.png");
}
a.vote_down {
background:url("images/thumb_down.png");
}
</style>
<script type='text/javascript' src='jquery.pack.js'></script>
<script type='text/javascript'>
$(function(){
$("a.vote_up").click(function(){
//get the id
the_id = $(this).attr('id');
// show the spinner
$(this).parent().html("<img src='images/spinner.gif'/>");
//fadeout the vote-count
$("span#votes_count"+the_id).fadeOut("fast");
//the main ajax request
$.ajax({
type: "POST",
data: "action=vote_up&id="+$(this).attr("id"),
url: "glosowanie.php",
success: function(msg)
{
$("span#votes_count"+the_id).html(msg);
//fadein the vote count
$("span#votes_count"+the_id).fadeIn();
//remove the spinner
$("span#vote_buttons"+the_id).remove();
}
});
});
$("a.vote_down").click(function(){
//get the id
the_id = $(this).attr('id');
// show the spinner
$(this).parent().html("<img src='images/spinner.gif'/>");
//the main ajax request
$.ajax({
type: "POST",
data: "action=vote_down&id="+$(this).attr("id"),
url: "votes.php",
success: function(msg)
{
$("span#votes_count"+the_id).fadeOut();
$("span#votes_count"+the_id).html(msg);
$("span#votes_count"+the_id).fadeIn();
$("span#vote_buttons"+the_id).remove();
}
});
});
});
</script>
</head>
<body>
<?php
/**
Display the results from the database
**/
$q = "SELECT * FROM baza";
$r = mysql_query($q);
if(mysql_num_rows($r)>0): //table is non-empty
while($row = mysql_fetch_assoc($r)):
$net_vote = $shit['votes_up'] - $shit['votes_down']; //this is the net result of voting up and voting down
?><?php endwhile; ?>
<div class='entry'>
<span class='link'>
<a href='<?php echo $row['link']; ?>'> <?php echo $row['title']; ?> </a>
</span>
<span class='votes_count' id='votes_count<?php echo $shit['id']; ?>'><?php echo $net_vote." votes"; ?></span>
<span class='vote_buttons' id='vote_buttons<?php echo $shit['id']; ?>'>
<a href='java script:;' class='vote_up' id='<?php echo $shit['id']; ?>'>Vote Up!</a>
<a href='java script:;' class='vote_down' id='<?php echo $shit['id']; ?>'>Vote Down!</a>
</span>
</div>
<?php
endif;
?>
Tylko zalogowany może głosować, jak teraz zrobić, aby sprawdzało, zapisywało adres IP osoby, która glosowala w danym artykule, oraz cookies? i zabraniała ponownego glosowania?