https://www.sense4care.com/wp-content/themes/thecorps/js/jquery.appear.js?ver=2.1.5

1/*
2 * jQuery.appear
3 * https://github.com/bas2k/jquery.appear/
4 * http://code.google.com/p/jquery-appear/
5 * http://bas2k.ru/
6 *
7 * Copyright (c) 2009 Michael Hixson
8 * Copyright (c) 2012-2014 Alexander Brovikov
9 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
10 */
11(function($) {
12 $.fn.appear = function(fn, options) {
13  var settings = $.extend({
14   //arbitrary data to pass to fn
15   data: undefined,
16   //call fn only on the first appear?
17   one: true,
18   // X & Y accuracy
19   accX: 0,
20   accY: 0
21  }, options);
22
23  return this.each(function() {
24   var t = $(this);
25   //whether the element is currently visible
26   t.appeared = false;
27   if (!fn) {
28    //trigger the custom event
29    t.trigger('appear', settings.data);
30    return;
31   }
32
33   var w = $(window);
34   //fires the appear event when appropriate
35   var check = function() {
36    //is the element hidden?
37    if (!t.is(':visible')) {
38     //it became hidden
39     t.appeared = false;
40     return;
41    }
42    //is the element inside the visible window?
43    var a = w.scrollLeft();
44    var b = w.scrollTop();
45    var o = t.offset();
46    var x = o.left;
47    var y = o.top;
48
49    var ax = settings.accX;
50    var ay = settings.accY;
51    var th = t.height();
52    var wh = w.height();
53    var tw = t.width();
54    var ww = w.width();
55
56    if (y + th + ay >= b &&
57     y <= b + wh + ay &&
58     x + tw + ax >= a &&
59     x <= a + ww + ax) {
60
61     //trigger the custom event
62     if (!t.appeared) t.trigger('appear', settings.data);
63    } else {
64     //it scrolled out of view
65     t.appeared = false;
66    }
67   };
68   //create a modified fn with some additional logic
69   var modifiedFn = function() {
70    //mark the element as visible
71    t.appeared = true;
72    //is this supposed to happen only once?
73    if (settings.one) {
74     //remove the check
75     w.unbind('scroll', check);
76     var i = $.inArray(check, $.fn.appear.checks);
77     if (i >= 0) $.fn.appear.checks.splice(i, 1);
78    }
79    //trigger the original fn
80    fn.apply(this, arguments);
81   };
82   //bind the modified fn to the element
83   if (settings.one) t.one('appear', settings.data, modifiedFn);
84   else t.bind('appear', settings.data, modifiedFn);
85   //check whenever the window scrolls
86   w.scroll(check);
87   //check whenever the dom changes
88   $.fn.appear.checks.push(check);
89   //check now
90   (check)();
91  });
92 };
93 //keep a queue of appearance checks
94 $.extend($.fn.appear, {
95  checks: [],
96  timeout: null,
97  //process the queue
98  checkAll: function() {
99   var length = $.fn.appear.checks.length;
100   if (length > 0)
101    while (length--)($.fn.appear.checks[length])();
102  },
103  //check the queue asynchronously
104  run: function() {
105   if ($.fn.appear.timeout) clearTimeout($.fn.appear.timeout);
106   $.fn.appear.timeout = setTimeout($.fn.appear.checkAll, 20);
107  }
108 });
109 //run checks when these methods are called
110 $.each(['append', 'prepend', 'after', 'before', 'attr',
111  'removeAttr', 'addClass', 'removeClass', 'toggleClass',
112  'remove', 'css', 'show', 'hide'
113 ], function(i, n) {
114  var old = $.fn[n];
115  if (old) {
116   $.fn[n] = function() {
117    var r = old.apply(this, arguments);
118    $.fn.appear.run();
119    return r;
120   }
121  }
122 });
123
124})(jQuery);