https://www.leoriginidivenezia.it/js/jquery.ui.totop.js

1(function($){
2	$.fn.UItoTop = function(options) {
3
4 		var defaults = {
5			text: '',
6			min: 500,			
7			scrollSpeed: 800,
8  			containerID: 'toTop',
9			containerHoverID: 'toTopHover',
10			easingType: 'easeOutCirc',
11			min_width:parseInt($('body').css("min-width"),10),
12			main_width:parseInt($('body').css("min-width"),10)/2
13 		};
14
15 		var settings = $.extend(defaults, options);
16		var containerIDhash = '#' + settings.containerID;
17		var containerHoverIDHash = '#'+settings.containerHoverID;
18			
19		$('body').append('<a href="#" id="'+settings.containerID+'">'+settings.text+'</a>');
20		
21		var button_width = parseInt($(containerIDhash).css("width"))+90
22		var button_width_1 = parseInt($(containerIDhash).css("width"))+20
23		var max_width = defaults.min_width+button_width;
24		var margin_right_1 = -(defaults.main_width+button_width_1)
25		var margin_right_2 = -(defaults.main_width-20)
26		
27		function top(){
28			if(($(window).width()<=max_width)&&($(window).width()>=defaults.min_width))$(containerIDhash).stop().animate({marginRight:margin_right_2,right:'50%'})
29			else if($(window).width()<=defaults.min_width)$(containerIDhash).stop().css({marginRight:0,right:10})
30			else $(containerIDhash).stop().animate({marginRight:margin_right_1,right:'50%'})
31		}
32		top()
33		$(containerIDhash).hide().click(function(){			
34			$('html, body').stop().animate({scrollTop:0}, settings.scrollSpeed, settings.easingType);
35			$('#'+settings.containerHoverID, this).stop().animate({'opacity': 0 }, settings.inDelay, settings.easingType);
36			return false;
37		})
38		
39		.prepend('<span id="'+settings.containerHoverID+'"></span>')
40		.hover(function() {
41				$(containerHoverIDHash, this).stop().animate({
42					'opacity': 1
43				}, 600, 'linear');
44			}, function() { 
45				$(containerHoverIDHash, this).stop().animate({
46					'opacity': 0
47				}, 700, 'linear');
48			});
49								
50		$(window).scroll(function() {
51			var sd = $(window).scrollTop();
52			if(typeof document.body.style.maxHeight === "undefined") {
53				$(containerIDhash).css({
54					'position': 'absolute',
55					'top': $(window).scrollTop() + $(window).height() - 50
56				});
57			}
58			if ( sd > settings.min ) 
59				$(containerIDhash).css({display: 'block'});
60			else 
61				$(containerIDhash).css({display: 'none'});
62		});
63		$(window).resize(function(){top()})
64};
65})(jQuery);
66
67$(window).load(function(){$().UItoTop({easingType: 'easeOutQuart'});})