Pagination error
Posted: Thu Jun 21, 2012 8:58 pm
I am having problem with pagination in php. I have already spent 3 days on this but i couldn't find the error. So finally decided to ask help from you guys.This pagination script simple queries like Select * from employee. But it gives errors when i use join in mysql query(no errors in 1st page. but when i click paginated pages there is no results and error are there).
errors
1.Notice: Undefined variable: lab_id in F:\xampplite\htdocs\chem\view_all_chemicallab.php on line 71
2.Notice: Undefined variable: lab_id in F:\xampplite\htdocs\chem\view_all_chemicallab.php on line 86
php script
This is my approach
Problem is with lab_id passing (As i think). So i have change this line
errors
1.Notice: Undefined variable: lab_id in F:\xampplite\htdocs\chem\view_all_chemicallab.php on line 71
2.Notice: Undefined variable: lab_id in F:\xampplite\htdocs\chem\view_all_chemicallab.php on line 86
php script
Code: Select all
<?php
require_once('auth.php');
include("config.php");
ini_set('display_errors', 1);
error_reporting(E_ALL);
if (isset($_POST['lab_id']) && is_numeric($_POST['lab_id']))
{
$lab_id = $_POST['lab_id'];
}
$targetpage = "view_all_chemicallab.php";
$limit = 5;
$query = "SELECT COUNT(*) as num FROM chemical
JOIN lab_inventory_chemical ON chemical.chemical_code = lab_inventory_chemical.chemical_code
WHERE lab_inventory_chemical.lab_id= '$lab_id' "; // this is line 71
$total_pages = mysql_fetch_array(mysql_query($query));
$total_pages = $total_pages['num'];
$stages = 3;
$page =isset($_GET['name'])?mysql_escape_string($_GET['page']): '';
if($page){
$start = ($page - 1) * $limit;
}else{
$start = 0;
}
// Get page data
$query1 = "SELECT * FROM chemical
JOIN lab_inventory_chemical ON chemical.chemical_code = lab_inventory_chemical.chemical_code
WHERE lab_inventory_chemical.lab_id='$lab_id' LIMIT $start, $limit"; //this is line 86
$result = mysql_query($query1);
// Initial page num setup
if ($page == 0){$page = 1;}
$prev = $page - 1;
$next = $page + 1;
$lastpage = ceil($total_pages/$limit);
$LastPagem1 = $lastpage - 1;
$paginate = '';
if($lastpage > 1)
{
$paginate .= "<div class='paginate'>";
// Previous
if ($page > 1){
$paginate.= "<a href='$targetpage?page=$prev'>previous</a>";
}else{
$paginate.= "<span class='disabled'>previous</span>"; }
// Pages
if ($lastpage < 7 + ($stages * 2)) // Not enough pages to breaking it up
{
for ($counter = 1; $counter <= $lastpage; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}
}
}
elseif($lastpage > 5 + ($stages * 2)) // Enough pages to hide a few?
{
// Beginning only hide later pages
if($page < 1 + ($stages * 2))
{
for ($counter = 1; $counter < 4 + ($stages * 2); $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}
}
$paginate.= "...";
$paginate.= "<a href='$targetpage?page=$LastPagem1'>$LastPagem1</a>";
$paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";
}
// Middle hide some front and some back
elseif($lastpage - ($stages * 2) > $page && $page > ($stages * 2))
{
$paginate.= "<a href='$targetpage?page=1'>1</a>";
$paginate.= "<a href='$targetpage?page=2'>2</a>";
$paginate.= "...";
for ($counter = $page - $stages; $counter <= $page + $stages; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}
}
$paginate.= "...";
$paginate.= "<a href='$targetpage?page=$LastPagem1'>$LastPagem1</a>";
$paginate.= "<a href='$targetpage?page=$lastpage'>$lastpage</a>";
}
// End only hide early pages
else
{
$paginate.= "<a href='$targetpage?page=1'>1</a>";
$paginate.= "<a href='$targetpage?page=2'>2</a>";
$paginate.= "...";
for ($counter = $lastpage - (2 + ($stages * 2)); $counter <= $lastpage; $counter++)
{
if ($counter == $page){
$paginate.= "<span class='current'>$counter</span>";
}else{
$paginate.= "<a href='$targetpage?page=$counter'>$counter</a>";}
}
}
}
// Next
if ($page < $counter - 1){
$paginate.= "<a href='$targetpage?page=$next'>next</a>";
}else{
$paginate.= "<span class='disabled'>next</span>";
}
$paginate.= "</div>";
}
// get results from database
// $result = mysql_query("SELECT * FROM members")
// or die(mysql_error());
// display data in table
echo "<div>";
echo "<table id='table1'>";
echo "<tr> <th>Chemical Name</th> <th>Chemical Code</th> <th>Type</th> <th>Edit</th><th>Delete</th><th>Stock</th> </tr>";
// loop through results of database query, displaying them in the table
while($row = mysql_fetch_array( $result ))
{
// echo out the contents of each row into a table
echo "<tr>";
echo '<td>'. $row['name'] . '</td>';
echo '<td>' . $row['chemical_code'] . '</td>';
echo '<td>' . $row['type'] . '</td>';
echo '<td><a href="editchemical.php?chemical_code=' . $row['chemical_code'] . '">Edit</a></td>';
echo "<td><a href=\"delete_chemical.php?chemical_code=" . $row['chemical_code'] ."\" * onclick=\"return confirm('Are you sure you want to delete?')\">Delete</a></td>";
echo '<td><a href="stock_chemical.php?chemical_code=' . $row['chemical_code'] . '">Stock</a></td>';
echo "</tr>";
}
echo "</table>";
echo $paginate;
echo "</div>";
?>This is my approach
Problem is with lab_id passing (As i think). So i have change this line
to this$targetpage = "view_all_chemicallab.php";
reason for this is as i think when i click on paginated pages it goes as GET method and i am posting lab_id in the beginning so better to use REQUEST which suits for both methods. But problem is still there Your help is highly appreciated. Thanks in advance$targetpage = "view_all_chemicallab.php?lab_id={$_REQUEST['lab_id']}";
but still i couldn't make this script work for POST $lab_id value 
