https://www.goo-net.com/common_v2/js/fixed_scroll.js?171128

1( function( $ ) {
2	$.fixedScroll = function ( box, options )
3	{
4
5		var agent = navigator.userAgent;
6		var isIE6 = false;
7		
8		box = $( box );
9		box.justify = '';
10		
11
12		if ( options.container && options.container != '')
13		{
14			box.cont = $( '#' + options.container );
15		}
16		else
17		{
18			box.cont = box.parent();
19		}
20		
21		if ( options.startNum && options.startNum != '')
22		{
23			box.startNum = options.startNum ;
24
25		}
26		else
27		{
28			box.startNum = 0;
29		}
30		
31		if ( options.num && options.num != '')
32		{
33			box.num = options.num ;
34		}
35		else
36		{
37			box.num = 0;
38		}
39		
40		if ( options.endNum && options.endNum != '')
41		{
42			box.endNum = options.endNum ;
43		}
44		else
45		{
46			box.endNum = 0;
47		}
48		
49		if( options.justify != '' )
50		{
51			box.justify = $( '#' + options.justify );
52			box.justify.margin = ( parseInt( box.justify.css( 'marginTop' ) ) || 0 ) + ( parseInt( box.justify.css( 'marginBottom' ) ) || 0 );
53		}
54		if (agent.indexOf('MSIE') != -1){
55			var ver = Number ( agent.substring((agent.indexOf('MSIE') + 5), (agent.indexOf('MSIE') + 8)) );
56			if(ver <= 6) isIE6 = true;
57		}
58
59		var parentTop = box.cont.offset().top;
60
61		var parentHeight = box.cont.height() - ( box.outerHeight(true) + box.num );
62		if ( options.containerHeight && options.containerHeight != '')
63		{
64			parentHeight = options.containerHeight;
65		}
66		var parentBoxHeight = box.parent().get(0).offsetHeight;
67		var leftMargin = box.offset().left - box.cont.offset().left;
68
69		if($('div').hasClass('box_gradeList')){
70			box.offsetTop =  box.cont.offset().top;
71		}else{
72			box.offsetTop =  box.offset().top;
73		}
74
75		box.margin = ( parseInt( box.css( 'marginTop' ) ) || 0 ) + ( parseInt( box.css( 'marginBottom' ) ) || 0 );
76		box.innerTop = box.offsetTop - parentTop;
77
78		$(window).load(function (){
79			scr();
80		});
81
82		$( window ).scroll( function (){
83			scr();
84		});
85		
86		$( window ).resize( function (){
87			scr();
88		});
89		
90		$( document ).bind( 'boxchanged', function ( event ){
91			scr();
92		});
93
94		function scr()
95		{
96			var diff = 0;
97			var pageScrollTop = $( window ).scrollTop();
98			var boxHeight = parseInt( box.get(0).offsetHeight ) + box.margin;
99			if( box.justify != '' ){
100				var justify = parseInt( box.justify.get(0).offsetHeight + box.justify.margin );
101				diff = justify - boxHeight ;
102				if( diff > parentBoxHeight ) diff = 0; 
103			}
104
105			if ( box.offsetTop - box.startNum > pageScrollTop )
106			{
107				box.css({
108					'position':	"absolute",
109					'top':		"0px",
110					'left':		"0px"
111					});
112			}
113			else if( ( boxHeight + pageScrollTop + diff ) < ( parentTop + parentHeight ) )
114			{
115				if(!isIE6){
116					var boxLeft = box.cont.offset().left + leftMargin ;
117					var scrLeft = $( window ).scrollLeft() ;
118					box.css({
119						'position':	"fixed",
120						'top':		"0px",
121						'left':		( boxLeft - scrLeft ) + "px"
122					});
123				}
124				else{
125					box.css({
126						'position':	"absolute",
127						'top':		( pageScrollTop - box.offsetTop ) + "px",
128						'left':		"0px",
129						'z-index': 9999
130					});
131				}
132			}
133			else
134			{
135				box.css({
136					'position':	"absolute",
137					'top':		( parentHeight - ( boxHeight + diff + box.endNum ) ) + "px",
138					'left':		"0px"
139				});
140			}
141		};
142		scr();
143
144
145	};
146	
147	$.fn.fixedScroll = function ( options )
148	{
149		options = options || {};
150		options.container = options.container || '';
151		options.justify = options.justify || '';
152		
153		this.each( function() 
154			{
155				new $.fixedScroll( this, options );
156			}
157		);
158
159		return this;
160	};
161
162})( jQuery );
163
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165
166