https://bawaslu.go.id/themes/custom/progressive/js/jquery.appear.js?v=1.x

1/*
2 * jQuery.appear
3 * https://github.com/bas2k/jquery.appear/
4 * http://code.google.com/p/jquery-appear/
5 *
6 * Copyright (c) 2009 Michael Hixson
7 * Copyright (c) 2012 Alexander Brovikov
8 * Licensed under the MIT license (http://www.opensource.org/licenses/mit-license.php)
9 */
10(function($) {
11	$.fn.appear = function(fn, options) {
12
13		var settings = $.extend({
14
15			//arbitrary data to pass to fn
16			data: undefined,
17
18			//call fn only on the first appear?
19			one: true,
20
21			// X & Y accuracy
22			accX: 0,
23			accY: 0
24
25		}, options);
26
27		return this.each(function() {
28
29			var t = $(this);
30
31			//whether the element is currently visible
32			t.appeared = false;
33
34			if (!fn) {
35
36				//trigger the custom event
37				t.trigger('appear', settings.data);
38				return;
39			}
40
41			var w = $(window);
42
43			//fires the appear event when appropriate
44			var check = function() {
45
46				//is the element hidden?
47				if (!t.is(':visible')) {
48
49					//it became hidden
50					t.appeared = false;
51					return;
52				}
53
54				//is the element inside the visible window?
55				var a = w.scrollLeft();
56				var b = w.scrollTop();
57				var o = t.offset();
58				var x = o.left;
59				var y = o.top;
60
61				var ax = settings.accX;
62				var ay = settings.accY;
63				var th = t.height();
64				var wh = w.height();
65				var tw = t.width();
66				var ww = w.width();
67
68				if (y + th + ay >= b &&
69					y <= b + wh + ay &&
70					x + tw + ax >= a &&
71					x <= a + ww + ax) {
72
73					//trigger the custom event
74					if (!t.appeared) t.trigger('appear', settings.data);
75
76				} else {
77
78					//it scrolled out of view
79					t.appeared = false;
80				}
81			};
82
83			//create a modified fn with some additional logic
84			var modifiedFn = function() {
85
86				//mark the element as visible
87				t.appeared = true;
88
89				//is this supposed to happen only once?
90				if (settings.one) {
91
92					//remove the check
93					w.unbind('scroll', check);
94					var i = $.inArray(check, $.fn.appear.checks);
95					if (i >= 0) $.fn.appear.checks.splice(i, 1);
96				}
97
98				//trigger the original fn
99				fn.apply(this, arguments);
100			};
101
102			//bind the modified fn to the element
103			if (settings.one) t.one('appear', settings.data, modifiedFn);
104			else t.bind('appear', settings.data, modifiedFn);
105
106			//check whenever the window scrolls
107			w.scroll(check);
108
109			//check whenever the dom changes
110			$.fn.appear.checks.push(check);
111
112			//check now
113			(check)();
114		});
115	};
116
117	//keep a queue of appearance checks
118	$.extend($.fn.appear, {
119
120		checks: [],
121		timeout: null,
122
123		//process the queue
124		checkAll: function() {
125			var length = $.fn.appear.checks.length;
126			if (length > 0) while (length--) ($.fn.appear.checks[length])();
127		},
128
129		//check the queue asynchronously
130		run: function() {
131			if ($.fn.appear.timeout) clearTimeout($.fn.appear.timeout);
132			$.fn.appear.timeout = setTimeout($.fn.appear.checkAll, 20);
133		}
134	});
135
136	//run checks when these methods are called
137	$.each(['append', 'prepend', 'after', 'before', 'attr',
138		'removeAttr', 'addClass', 'removeClass', 'toggleClass',
139		'remove', 'css', 'show', 'hide'], function(i, n) {
140		var old = $.fn[n];
141		if (old) {
142			$.fn[n] = function() {
143				var r = old.apply(this, arguments);
144				$.fn.appear.run();
145				return r;
146			}
147		}
148	});
149
150})(jQuery);