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How to Make Image Gallery in PHP with AJAX and Light-box

Discussion in 'PHP' started by ManzZup, Dec 26, 2010.

  1. ManzZup

    ManzZup New Member

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    Article is about making a simple yet powerful Gallery system using PHP, AJAX and Lightbox

    Background



    Some days ago i started ma new project im building our site (for the 4th time) :D Thought to do a real difference so everything i needed to code by me. Hope this will help you too.

    The Code



    [​IMG]

    Let's get started.

    Steps:
    1. Make a simple php script that can retrieve the records about images from the database and do the dynamic page breaking.
    2. Adding the lightbox to have a little show off :D
    3. Adding the AJAX part
    PHP script

    First thing we need is to make a php script that can retrieve all the records about the images and do page breaking. Here i used to store the info in a database rather than reading directly from a folder. This makes it possible for me to add an image description. So, when i retrieve the images possibly i want to do the dynamic page breaking, adding the pages automatically so there's no mess there.

    First make a folder name "res" and add some pics to it.

    Then in your database make a new table "images"

    Add 3 fields,
    *ID [auto increment],
    *Img - path to the image
    *Desc - Description of the image

    After add some record to it

    I added 10 for the testing purposes

    Now the php script

    Make a file named view.php

    NOTE: I have used CSS styling here so be patient to see the CSS style after this code :D

    [view.php]
    PHP:

    <?php

    $start 
    1;     // This is the variable that stores the current page of the gallery. Default its set to 1 to prevent errors

    $page_name "view.php"//The name if added to make things easier

    if(isset($_GET['q']))$start $_GET['q']; //Check weather a variable is passed to page, if so it become the current page number.

    $limit 5;  //Number of pictures that should be shown per page
    $eu = (($start-1) * $limit);  //Get the offset to be used in Mysql query, dont bother about it :D

    $conn mysql_connect(db_host,db_user,db_pwd);   //Connecting to the databse, put the necessary variables. Ex: db_host replace with "127.0.0.1"

    if(!($conn)) echo "Failed To Connect To The Database!";
    else{
        
        if(
    mysql_select_db(db_name,$conn)){  //Check weather databse exists

    //From here we first do the page breaking as it takes the big deal of the script

        
    $no mysql_num_rows(mysql_query("SELECT * FROM images")); //Count number of rows

        
    $max ceil($no/$limit);  //Divide it by the limit and round off to detemine the number of pages


    $nav "";    //This variable determines the pages
        
    for($page 1$page <= $max$page++)   //Loop to get the pages
    {
       if (
    $page == $start)
       {
          
    $nav .= "<span class=\"sel\"> $page </span>"// no need to create a link if the start page == current page
       
    }
       else
       {
          
    $nav .= " <a href=\"$page_name?q=$page\">$page</a> "//Else add the page number, here the link of <a href> is the same page passed with argument of page number ('q')

       

    }
    if(
    $start 1){     //Above codes make a complete thing but its rather good to add these, the professional features. This add [Prev] and [First].

        
    $page $start 1;
        
    $prev " <a href=\"$page_name?q=$page\">[Prev]</a> ";
        
    $first " <a href=\"$page_name?q=1\" \">[First]</a> ";
    }else{
        
    $prev  '&nbsp;';
        
    $first  '&nbsp;';
    }

    if(
    $start $max){   //This adds the [Next] and [Last] i think the code is pretty understandable.
        
    $page $start +1;
        
    $next " <a href=\"$page_name?q=$page\">[Next]</a> ";
        
    $last " <a href=\"$page_name?q=$max\">[Last]</a> ";
    }else{
        
    $next  '&nbsp;';
        
    $last  '&nbsp;';
    }

    echo 
    "<div id=\"nav\">".$first$prev$nav$next$last."</div>";  //Now we write the navigation bar.
    echo "<br />";

    //Right. Heyy what about the images?? Ohh :D here it comes

        
    $result mysql_query("SELECT * FROM images LIMIT $eu,$limit");
    //In the above query the records are called from a specific no of records($limit) starting by a specified point($eu) ex: "SELECT * FROM images LIMIT 10,20" is thats what passed, Mysql will return records starting from the 10th records (including 10th) another 20 mean 10-39. This way page breaking is pretty simple :D



        
    while($rows mysql_fetch_array($result)){
            
    $img $rows['Img'];       //get the img URL
            
    $test getimagesize($img); //This is optional but you may need
            
    $desc "Description :" .$rows['Desc']. "<br />".
                    
    "File Name :" .basename($img) ."<br />"
                    
    "Diemensions :" .$test[0]. "x" .$test[1]. "<br />".
                    
    "File Size :" .ceil(filesize($img)/1024). "KB";
                     
    //Above whole of it was about makign a nice description of the image.

            
    echo "<a href=\"".$img."\" rel=\"lightbox[gal]\" title=\"".$desc."\"><img src=\"" .$img"\"/></a>";
                   
    //Add the images, looping though the records
                   //AURAH! php done :D
        
    }
        
        
       }    
    }

    ?>
    Just dont run before adding the CSS style

    [style.css]
    HTML:
    img{
    	height:25%;
        padding:10px;
    	border:2px solid #666;
    	margin:5px;
    }
    
    #nav{
    	left:0;
    	text-align:center;
    	font-family:"calibri";
    	font-size:18px;
    	text-decoration:none
    }
    #nav .sel{font-size:22px}
    
    A:link,A:visited,A:active, A:hover { text-decoration: none; color:#333}
    
    And add this to attach the CSS style Add to the bottom of view.php
    .....
    ?>
    HTML:
    <html>
    <head>
    <link href="style.css" rel="stylesheet" type="text/css">
    </head>
    </html>
    
    Now you'll see a pretty much good :D gallery.

    Adding lightbox

    Light box is a very attrtactive feature used in many things today. In the code above you'll notice that the <img /> tag is full of other things which of course related to the lightbox. So first Download Lightbox.

    Now extract all the directory where you have the view.php but DONT extract the index.html.

    Now we have to do the linking of the Lightbox.

    Modify the HTML code like this:
    HTML:
    <html>
    <head>
    <script type="text/javascript" src="js/prototype.js"></script>
    <script type="text/javascript" src="js/scriptaculous.js?load=effects,builder"></script>
    <script type="text/javascript" src="js/lightbox.js"></script>
    <link rel="stylesheet" href="css/lightbox.css" type="text/css" media="screen" />
    <link href="style.css" rel="stylesheet" type="text/css">
    </head>
    </html>
    

    Now you click on images and SEE A WONDER :DD

    Adding AJAX

    AJAX(Asynchronous JavaScript and XML_) is an attractive technology ijmplemented by many popular sites.

    ex: in facebook the images load when browsing a Gallery without loading pages seperately. This allows easy navigation to the user. Adding AJAX is pretty much simple in our case.

    Make a new file called inidex.php

    This is the page that user first sees

    Heres the code for it

    [index.php]
    PHP:
    <html>
    <
    head>
    <
    title>My Gallery</title>

    <
    script type="text/javascript">
    function 
    init(){
        
    view(1);
    }
    function 
    view(no){

    xmlhttp = new XMLHttpRequest();  //Make a new XML request. It is used to send the AJAX requests.
    xmlhttp.onreadystatechange=function() //This function retrieves the response from the page and shows it in the content area

      
    {
      if (
    xmlhttp.readyState==&& xmlhttp.status==200)
        {
        
    document.getElementById("load_area").innerHTML=xmlhttp.responseText;
        }else{
            
    document.getElementById("load_area").innerHTML "Loading please wait ....";
        }
      }
        
    xmlhttp.open("GET","view.php?q="+no,true); //Here the resource path is view.php we made before. But now we have to adjust the code of view.php to suit with AJAX

        
    xmlhttp.send();
    }
          
    window.onload init;  //At loading we load the 1st set of images to prevent errors
    </script>

    <!-- the Lightbox part should be added to this -->
    <script type="text/javascript" src="js/prototype.js"></script>
    <script type="text/javascript" src="js/scriptaculous.js?load=effects,builder"></script>
    <script type="text/javascript" src="js/lightbox.js"></script>
    <link rel="stylesheet" href="css/lightbox.css" type="text/css" media="screen" />
    <link href="style.css" rel="stylesheet" type="text/css">

    </head>
    <div id="load_area">
    </div>
    </html>
    Here's how the view.php should be edited

    [view.php]
    PHP:

    ...
    .
    .

    else
       {
          
    $nav .= " <a href=\"#$page\" onClick=\"view($page)\">$page</a> "//Note that Onclick event is added to call the javascript function when the link is clicked

       

    ...
    ..
        
    $prev " <a href=\"#$page\" onClick=\"view($page)\">[Prev]</a> ";
        
    $first " <a href=\"#1\" onClick=\"view(1)\">[First]</a> ";
    ...
    .
    ..
         
    $next " <a href=\"#$page\" onClick=\"view($page)\">[Next]</a> ";
         
    $last " <a href=\"#$max\" onClick=\"view($max)\">[Last]</a> ";
    ..
    ..
    in style.css
    img{ replaced with #load_area img{

    VIOLAAAAAHH!!!!!
    DONE it

    You'have sucessfully made an Ajax+Lightbox+php Gallery

    Alter things to make it more attractive.

    [​IMG]

    [​IMG]
     
  2. keyideas

    keyideas New Member

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    Hello ManzZup,

    You have share a very useful tips to me. I was really searching this script as I developing an image gallery where this script is to used.

    Thanks,
     
  3. ManzZup

    ManzZup New Member

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    your welcome :)
    please ask for any other details
     
  4. eBiz

    eBiz New Member

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    Thanks a lot.
    For this knowledge.

    I have not tried. But I think there must be certain benefits in the future.
     
  5. adammarleymtts

    adammarleymtts Banned

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    Wow this is a great post. And this is very interesting and useful. I would like to work on this. Thanks for sharing it with us.
     
  6. ManzZup

    ManzZup New Member

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    thank you guys :)
     
  7. neerjasoftwares

    neerjasoftwares New Member

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    With following through your beneficail advice, I started using it but I am having a little bit problem in doing so. Some images are showing up in one browser but some got blind in the other. As you can see my Services page, where I used some of the images
    Please sir help me for this at the earliest....In need of your reply at the urgent.
     
  8. ManzZup

    ManzZup New Member

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    i think you would be receiving problems with some older browsers [specially IE6/7] but i have tested on most of the newer ones without any prblem
    can you direct me a link to check up the problem and state the browsers you were testing this on?
     

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