В этой галерее мы будем комбинировать свойство z-index и мощь jQuery. Будем изменять значение z-index и тем самым пролистывать изображения, а jquery займется анимацией.

Разметка  HTML

Классы grid_6, grid_3 и т.д. которые используются в Демо - это просто используется CSS фреймворк grid 960 - о котором мы говорили в отдельной статье.

       <div class="grid_6 prefix_1 suffix_1" id="gallery">
          <div id="pictures">
            <img src="images/picture1.png" alt="" />
            <img src="images/picture2.png" alt="" />
            <img src="images/picture3.png" alt="" />
            <img src="images/picture4.png" alt="" />
            <img src="images/picture5.png" alt="" />
          </div>
         
          <div class="grid_3 alpha" id="prev">
            <a href="#previous">&laquo; Назад</a>
          </div>
          <div class="grid_3 omega" id="next">
            <a href="#next">Вперед &raquo;</a>
          </div>
       </div>

CSS

Вот и все стили, что используются непосредственно для работы галереи:

 #gallery { position: relative; }
    #pictures { position: relative; height: 408px; }
    #pictures img { position: absolute; top: 0; left: 0; }
   
    #prev, #next { margin-top: 30px; text-align: center; font-size: 2.0em; }
 
  #loader { position: absolute; top: 0; left:0; height: 458px; width: 100%; background: url(../images/ajax-loader.gif) white no-repeat center center; z-index: 9999; }

javascript

Подключаем jQuery и срипт галереи:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
    <script type="text/javascript" src="js/demo.js"></script>

Вот содержимое файла demo.js:

$(document).ready(function() { //perform actions when DOM is ready
  var z = 0; //for setting the initial z-index's
  var inAnimation = false; //flag for testing if we are in a animation
  var imgLoaded = 0; //for checking if all images are loaded
 
  $('#pictures').append('<div id="loader"></div>'); //append the loader div, it overlaps all pictures
 
  $('#pictures img').each(function() { //set the initial z-index's
    z++; //at the end we have the highest z-index value stored in the z variable
    $(this).css('z-index', z); //apply increased z-index to <img>
   
    $(new Image()).attr('src', $(this).attr('src')).load(function() { //create new image object and have a callback when it's loaded
      imgLoaded++; //one more image is loaded
     
      if(imgLoaded == z) { //do we have all pictures loaded?
        $('#loader').fadeOut('slow'); //if so fade out the loader div
      }
    });
  });

  function swapFirstLast(isFirst) {
    if(inAnimation) return false; //if already swapping pictures just return
    else inAnimation = true; //set the flag that we process a image
   
    var processZindex, direction, newZindex, inDeCrease; //change for previous or next image
   
    if(isFirst) { processZindex = z; direction = '-'; newZindex = 1; inDeCrease = 1; } //set variables for "next" action
    else { processZindex = 1; direction = ''; newZindex = z; inDeCrease = -1; } //set variables for "previous" action
   
    $('#pictures img').each(function() { //process each image
      if($(this).css('z-index') == processZindex) { //if its the image we need to process
        $(this).animate({ 'top' : direction + $(this).height() + 'px' }, 'slow', function() { //animate the img above/under the gallery (assuming all pictures are equal height)
          $(this).css('z-index', newZindex) //set new z-index
            .animate({ 'top' : '0' }, 'slow', function() { //animate the image back to its original position
              inAnimation = false; //reset the flag
            });
        });
      } else { //not the image we need to process, only in/de-crease z-index
        $(this).animate({ 'top' : '0' }, 'slow', function() { //make sure to wait swapping the z-index when image is above/under the gallery
          $(this).css('z-index', parseInt($(this).css('z-index')) + inDeCrease); //in/de-crease the z-index by one
        });
      }
    });
   
    return false; //don't follow the clicked link
  }
 
  $('#next a').click(function() {
    return swapFirstLast(true); //swap first image to last position
  });
 
  $('#prev a').click(function() {
    return swapFirstLast(false); //swap last image to first position
  });
});

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