Ajax Next / Previous Picture (jQuery / PHP)

If you are looking for a simple script to navigate next / previous image without refreshing page, this example will do exactly that using jQuery Ajax and PHP.

SQL Tabe

Following SQL code creates a table named "pictures" with 3 columns (id, PictureTitle, PictureName) and inserts pictures data into the table.
MYSQL
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CREATE TABLE IF NOT EXISTS `pictures` ( `id` int(11) NOT NULL AUTO_INCREMENT, `PictureTitle` varchar(60) NOT NULL, `PictureName` varchar(60) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=6 ; INSERT INTO `pictures` (`id`, `PictureTitle`, `PictureName`) VALUES (1, 'Benjamin Button', 'benjamin_button.jpg'), (2, 'Liv Taylor', 'liv-taylor.jpg'), (3, 'Macro Shot 1', 'pic1.jpg'), (4, 'Macro Shot 2', 'pic2.jpg'), (5, 'Sweets', 'mysweets.jpg');

Index Page

A picture will be loaded primarily, and then user can navigate to next / previous images without refreshing the page. Below is the jQuery code that sends Ajax request to getpicture.php to fetch picures.
jQuery
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$(document).ready(function() { $.post( "getpicture.php", { pic: "1"}, function( data ) { $("#picture").html( data ); }); $("#picture").on("click",".get_pic", function(e){ var picture_id = $(this).attr(\'data-id\'); $("#picture").html("<div style=\"margin:50px auto;width:50px;\"><img src=\"loader.gif\" /></div>"); $.post( "getpicture.php", { pic: picture_id}, function( data ) { $("#picture").html( data ); }); return false; }); });

getpicture.php

File gets image id from index.php, and gets image information from database, creates next/previous buttonĀ returns image data back to index.php. Replace xxxxx with your MySQL username, password and database name.
PHP
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$username = "root"; //mysql username $password = ""; //mysql password $hostname = "localhost"; //hostname $databasename = 'test'; //databasename //get pic id from ajax request if(isset($_POST["pic"]) && is_numeric($_POST["pic"])) { $current_picture = filter_var($_POST["pic"], FILTER_SANITIZE_NUMBER_INT); }else{ $current_picture=1; } //Connect to Database $mysqli = new mysqli($hostname, $username, $password, $databasename); if ($mysqli->connect_error){ die('Error : ('. $mysqli->connect_errno .') '. $mysqli->connect_error); } //get next picture id $result = $mysqli->query("SELECT id FROM pictures WHERE id > $current_picture ORDER BY id ASC LIMIT 1")->fetch_object(); if($result){ $next_id = $result->id; } //get previous picture id $result = $mysqli->query("SELECT id FROM pictures WHERE id < $current_picture ORDER BY id DESC LIMIT 1")->fetch_object(); if($result){ $prev_id = $result->id; } //get details of current from database $result = $mysqli->query("SELECT PictureTitle, PictureName FROM pictures WHERE id = $current_picture LIMIT 1")->fetch_object(); if($result){ //construct next/previous button $prev_button = (isset($prev_id) && $prev_id>0)?'<a href="#" data-id="'.$prev_id.'" class="get_pic"><img src="prev.png" border="0" /></a>':''; $next_button = (isset($next_id) && $next_id>0)?'<a href="#" data-id="'.$next_id.'" class="get_pic"><img src="next.png" border="0" /></a>':''; //output html echo '<table width="500" border="0" cellpadding="5" cellspacing="0">'; echo '<tr>'; echo '<td><table width="100%" border="0" cellpadding="5" cellspacing="0">'; echo '<tr>'; echo '<td width="10%">'.$prev_button.'</td>'; echo '<td width="80%" align="center"><h3>'.$result->PictureTitle.'</h3></td>'; echo '<td width="10%">'.$next_button.'</td>'; echo '</tr>'; echo '</table></td>'; echo '</tr>'; echo '<tr>'; echo '<td align="center"><img src="pictures/'.$result->PictureName.'" /></td>'; echo '</tr>'; echo '</table>'; }
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