https://www.wagnaria.com/assets/js/jquery.exscrollevent.js

1/*
2 * 	exScrollEvent 1.0.0 - jQuery plugin
3 *	written by Cyokodog	
4 *
5 *	Copyright (c) 2009 Cyokodog (http://d.hatena.ne.jp/cyokodog/)
6 *	Dual licensed under the MIT (MIT-LICENSE.txt)
7 *	and GPL (GPL-LICENSE.txt) licenses.
8 *
9 *	Built for jQuery library
10 *	http://jquery.com
11 *
12 *
13 *      2013.09 add scrollYdown scrollYup
14 *
15 */
16(function($j){
17	$j.ex = $j.ex || {};
18	$j.ex.scrollEvent = function( target , config ){
19		var o = this;
20		if( typeof config == 'function') config = {
21			callback : config
22		}
23		var c = o.config = $j.extend({},$j.ex.scrollEvent.defaults,config,{
24			target : target
25		});
26		c.status = 0;
27		c.scroll = o.getPos();
28		c.target.scroll(function( evt ){
29			if (o.isMove()) {
30				c.status = (c.status == 0 ? 1 : (c.status == 1 ? 2 : c.status) );
31				c.callback( evt , c );
32			}
33			if(c.tm) clearTimeout(c.tm);
34			c.tm = setTimeout(function(){
35				o.isMove();
36				c.status = 0;
37				c.callback( evt , c );
38			},c.delay);
39		});
40	}
41	$j.extend($j.ex.scrollEvent.prototype,{
42		isMove : function(){
43			var o = this, c = o.config;
44			var pos = o.getPos();
45			var scrollYdown = (pos.top != c.scroll.top && pos.top > c.scroll.top);
46			var scrollYup = (pos.top != c.scroll.top && pos.top < c.scroll.top);
47			var scrollX = (pos.left != c.scroll.left);
48			if(scrollYdown || scrollYup || scrollX){
49				c.scrollYdown = scrollYdown;
50				c.scrollYup = scrollYup;
51				c.scrollX = scrollX;
52				c.prevScroll = c.scroll;
53				c.scroll = pos;
54				return true;
55			}
56			return false;
57
58		},
59		getPos : function(){
60			var o = this, c = o.config;
61			return {
62				top : c.target.scrollTop(),
63				left : c.target.scrollLeft()
64			}		
65		}
66	});
67	$j.ex.scrollEvent.defaults = {
68		delay : 100
69	}
70	$j.fn.exScrollEvent = function( config ){
71		new $j.ex.scrollEvent(this , config);
72		return this;
73	};
74})(jQuery);