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Filename : jquery.appear.js
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/*
 * jQuery.appear
 * https://github.com/bas2k/jquery.appear/
 * http://code.google.com/p/jquery-appear/
 * http://bas2k.ru/
 *
 * Copyright (c) 2009 Michael Hixson
 * Copyright (c) 2012-2014 Alexander Brovikov
 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
 */
(function($) {
 $.fn.appear = function(fn, options) {
  var settings = $.extend({
   //arbitrary data to pass to fn
   data: undefined,
   //call fn only on the first appear?
   one: true,
   // X & Y accuracy
   accX: 0,
   accY: 0
  }, options);

  return this.each(function() {
   var t = $(this);
   //whether the element is currently visible
   t.appeared = false;
   if (!fn) {
    //trigger the custom event
    t.trigger('appear', settings.data);
    return;
   }

   var w = $(window);
   //fires the appear event when appropriate
   var check = function() {
    //is the element hidden?
    if (!t.is(':visible')) {
     //it became hidden
     t.appeared = false;
     return;
    }
    //is the element inside the visible window?
    var a = w.scrollLeft();
    var b = w.scrollTop();
    var o = t.offset();
    var x = o.left;
    var y = o.top;

    var ax = settings.accX;
    var ay = settings.accY;
    var th = t.height();
    var wh = w.height();
    var tw = t.width();
    var ww = w.width();

    if (y + th + ay >= b &&
     y <= b + wh + ay &&
     x + tw + ax >= a &&
     x <= a + ww + ax) {

     //trigger the custom event
     if (!t.appeared) t.trigger('appear', settings.data);
    } else {
     //it scrolled out of view
     t.appeared = false;
    }
   };
   //create a modified fn with some additional logic
   var modifiedFn = function() {
    //mark the element as visible
    t.appeared = true;
    //is this supposed to happen only once?
    if (settings.one) {
     //remove the check
     w.unbind('scroll', check);
     var i = $.inArray(check, $.fn.appear.checks);
     if (i >= 0) $.fn.appear.checks.splice(i, 1);
    }
    //trigger the original fn
    fn.apply(this, arguments);
   };
   //bind the modified fn to the element
   if (settings.one) t.one('appear', settings.data, modifiedFn);
   else t.bind('appear', settings.data, modifiedFn);
   //check whenever the window scrolls
   w.scroll(check);
   //check whenever the dom changes
   $.fn.appear.checks.push(check);
   //check now
   (check)();
  });
 };
 //keep a queue of appearance checks
 $.extend($.fn.appear, {
  checks: [],
  timeout: null,
  //process the queue
  checkAll: function() {
   var length = $.fn.appear.checks.length;
   if (length > 0)
    while (length--)($.fn.appear.checks[length])();
  },
  //check the queue asynchronously
  run: function() {
   if ($.fn.appear.timeout) clearTimeout($.fn.appear.timeout);
   $.fn.appear.timeout = setTimeout($.fn.appear.checkAll, 20);
  }
 });
 //run checks when these methods are called
 $.each(['append', 'prepend', 'after', 'before', 'attr',
  'removeAttr', 'addClass', 'removeClass', 'toggleClass',
  'remove', 'css', 'show', 'hide'
 ], function(i, n) {
  var old = $.fn[n];
  if (old) {
   $.fn[n] = function() {
    var r = old.apply(this, arguments);
    $.fn.appear.run();
    return r;
   }
  }
 });

})(jQuery);