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.

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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.

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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.

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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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