extra pagination links don't show query results

turpentyne · August 28, 2010

I've got a page with pagination set up, but I can't figure out where I went wrong with the links at the bottom.

When I do a search, it generates the proper number of links, but clicking on the links goes to a page with a whole row of 20 links at the bottom and no results on the page. (my search should show 3 pages with 2 records on each page)

I've looked through the tutorial here and one in a book on pagination. Not seeing what's wrong. I'd narrow this down if I knew where it was causing the problem. pagination links are at the very bottom of the code.



<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html><head>
<meta content="text/html; charset=ISO-8859-1" http-equiv="content-type"><title>search.html</title></head>
<body>
<center>
<p>The results of your search:</p>
<br>
</center>
require ('databaseconnect.php');

$select = mysql_select_db($db, $con);
if(!$select){
die(mysql_error());
}

$display = 2;

if (isset($_GET['np'])) {
   $num_pages = $_GET['np'];
} else { 
$data = "SELECT COUNT(*)
                    FROM
                        descriptors
                    LEFT JOIN
                        plantae ON (descriptors.plant_id = plantae.plant_name)
                    WHERE
                        `leaf_shape` LIKE '%$select1%'
                        AND `leaf_venation` LIKE '%$select3%'
                        AND `leaf_margin` LIKE '%$select4%'";
                    
  
$result = mysql_query ($data);
if (!$result) {
    die("Oops, my query failed.  The query is: <br>$data<br>The error is:<br>".mysql_error());
} 


$row = mysql_fetch_array($result, MYSQL_NUM);
// row 41
$num_records = $row[0];

if ($num_records > $display) {
   $num_pages = ceil ($num_records/$display);
} else {
$num_pages = 1;
}
}
if (isset($_GET['s'])) {
   $start = $_GET['s'];
} else {
    $start = 0;
}

if(isset($_POST[submitted])) {
// Now collect all info into $item variable
$shape = $_POST['select1'];
$color = $_POST['select2'];
$vein = $_POST['select3'];
$margin = $_POST['select4'];




// This will take all info from database where row tutorial is $item and collects it into $data variable row 55

$data = mysql_query("SELECT
                        `descriptors`.*
                        ,`plantae`.*
                    FROM
                        `descriptors`
                    LEFT JOIN
                        `plantae` ON (`descriptors`.`plant_id` = `plantae`.`plant_name`)
                    WHERE
                        `leaf_shape` LIKE '%$select1%'
                        AND `leaf_venation` LIKE '%$select3%'
                        AND `leaf_margin` LIKE '%$select4%'
                    ORDER BY `plantae`.`scientific_name` ASC LIMIT $start, $display");



//chs added this in... row 72
echo '<table align="center" cellspacing="0" cellpading-"5">
<tr>
<td align="left"><b></b></td>
<td align="left"><b></b></td>
<td align="left"><b>Leaf margin</b></td>
<td align="left"><b>Leaf venation</b></td>
</tr>
';

// This creates a loop which will repeat itself until there are no more rows to select from the database. We getting the field names and storing them in the $row variable. This makes it easier to echo each field.

while($row = mysql_fetch_array($data)){
echo '<tr>
<td align="left"> <a href="link.php">View plant</a>    </td>
<td align="left"> <a href="link.php">unknown link</a>   </td>
<td align="left">' . $row['scientific_name'] . '</td>
<td align="left">' . $row['common_name'] . '</td>
<td align="left">' . $row['leaf_shape'] . '</td>
</tr>';
}
echo '</table>';
}
if ($num_pages > 1) {
echo '<br /><p>';
$current_page = ($start/$display) + 1;
// row 100
if ($current_page != 1) {
echo '<a href="leafsearch2a.php?s=' . ($start - $display) . '&np=;' . $num_pages . '">Previous</a> ';
}

for ($i = 1; $i <= $num_pages; $i++) {
if($i != $current_page) {
echo '<a href="leafsearch2a.php?s=' . (($display * ($i - 1))) . '$np=' . $num_pages . '">' . $i . '</a>';
} else {
echo $i . ' ';
}
}

if ($current_page != $num_pages) {
echo '<a href="leafsearch2a.php?s=' . ($start + $display) . '$np=' . " " . $num_pages . '">  Next</a>';
}
} 
?>

</body></html>

Rifts · August 28, 2010

Hey I know this isnt an answer to your question but this may help

http://php.about.com/od/phpwithmysql/ss/php_pagination.htm

also you might get an answer quick if you use

tags instead of

turpentyne · September 4, 2010

I'm still completely lost on this. I've looked at tutorials. I've read books. I'm missing something and I don't know what.

The best guess I can come up with is that the _post variables that were searched for do not pass through correctely (or at all?) when I click on the pagination links on the bottom. I've had the same thing happen on a couple different scripts.

please please, can somebody help? I'm struggling to understand what I'm doing here.

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