https://xn--m9jp3ya3i5308a7pvb.com/wp-content/themes/01the_world_default/js/homing.js

1jQuery(function($){
2
3	function conf_fix_box(name, wrapper)
4	{
5		try {
6			var fix_box = $(name);
7			var main_bottom = $(wrapper).offset().top + $(wrapper).height();
8
9			/*
10				name   : 移動させるボックスのjQueryセレクタ。ただひとつを指定できることが条件。
11				start  : 移動最上限のTOP。absoluteな値。
12				offset : 追尾中の位置のTOP。fixな値。
13				stop   : 停止位置。absoluteな値。
14			*/
15			
16			return {
17				name: name,
18				start: fix_box.offset().top,
19				offset: 20,
20				stop: main_bottom - fix_box.height()
21			};
22		}
23		catch(e) {
24			return null;
25		}
26	}
27
28	function initialize($, obj){
29		var name = obj.name || "#floatMenu";
30		var start = obj.start || 100;
31		var stop = obj.stop || 700;
32		var offset = obj.offset || 20;
33
34		var x = $(':has(' + name + ')').filter(function(){ return($(this).css('position') == 'relative')});
35		var adjust = (x.length > 0 ? x.offset().top : 0);
36
37		$(window).scroll(function () {
38			var windowTop = $(window).scrollTop();
39
40			if($(window).width() < 480)
41				$(name).css("position", "static").css("top", (start - adjust) + "px");
42			else if(windowTop < (start - offset))
43				$(name).css("position", "static").css("top", (start - adjust) + "px");
44			else if(windowTop >= (stop - offset))
45				$(name).css("position", "absolute").css("top", (stop - adjust) + "px");
46			else
47				$(name).css("position", "fixed").css("top", offset + "px");
48		});
49	};
50
51	var ary = [];
52
53	ary.pushUnlessNull = function (itm)
54	{
55		if(itm != null)
56			this.push(itm);
57		return this;
58	}
59
60	ary.pushUnlessNull(conf_fix_box("#fix_box1", '#main_contents'))
61	.pushUnlessNull(conf_fix_box("#fix_box2", '#main_contents'));
62	for(i = 0; i < ary.length; i++)
63		initialize($, ary[i]);
64});