https://www.falpsrl.it/wp-content/plugins/spider-faq/elements/jque…?ver=86832d00d5d8df82791788a0ca72cc58

1/**
2 * jQuery.ScrollTo
3 * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
4 * Dual licensed under MIT and GPL.
5 * Date: 3/9/2009
6 *
7 * @projectDescription Easy element scrolling using jQuery.
8 * http://flesler.blogspot.com/2007/10/jqueryscrollto.html
9 * Works with jQuery +1.2.6. Tested on FF 2/3, IE 6/7, Opera 9.5/6, Safari 3, Chrome 1 on WinXP.
10 *
11 * @author Ariel Flesler
12 * @version 1.4.1
13 *
14 * @id jQuery.scrollTo
15 * @id jQuery.fn.scrollTo
16 * @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements.
17 *	  The different options for target are:
18 *		- A number position (will be applied to all axes).
19 *		- A string position ('44', '100px', '+=90', etc ) will be applied to all axes
20 *		- A jQuery/DOM element ( logically, child of the element to scroll )
21 *		- A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc )
22 *		- A hash { top:x, left:y }, x and y can be any kind of number/string like above.
23 * @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead.
24 * @param {Object,Function} settings Optional set of settings or the onAfter callback.
25 *	 @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'.
26 *	 @option {Number} duration The OVERALL length of the animation.
27 *	 @option {String} easing The easing method for the animation.
28 *	 @option {Boolean} margin If true, the margin of the target element will be deducted from the final position.
29 *	 @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }.
30 *	 @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes.
31 *	 @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends.
32 *	 @option {Function} onAfter Function to be called after the scrolling ends. 
33 *	 @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends.
34 * @return {jQuery} Returns the same jQuery object, for chaining.
35 *
36 * @desc Scroll to a fixed position
37 * @example $('div').scrollTo( 340 );
38 *
39 * @desc Scroll relatively to the actual position
40 * @example $('div').scrollTo( '+=340px', { axis:'y' } );
41 *
42 * @dec Scroll using a selector (relative to the scrolled element)
43 * @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } );
44 *
45 * @ Scroll to a DOM element (same for jQuery object)
46 * @example var second_child = document.getElementById('container').firstChild.nextSibling;
47 *			$('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){
48 *				alert('scrolled!!');																   
49 *			}});
50 *
51 * @desc Scroll on both axes, to different values
52 * @example $('div').scrollTo( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } );
53 */
54;(function( $ ){
55	
56	var $scrollTo = $.scrollTo = function( target, duration, settings ){
57		$(window).scrollTo( target, duration, settings );
58	};
59
60	$scrollTo.defaults = {
61		axis:'xy',
62		duration: parseFloat($.fn.jquery) >= 1.3 ? 0 : 1
63	};
64
65	// Returns the element that needs to be animated to scroll the window.
66	// Kept for backwards compatibility (specially for localScroll & serialScroll)
67	$scrollTo.window = function( scope ){
68		return $(window).scrollable();
69	};
70
71	// Hack, hack, hack... stay away!
72	// Returns the real elements to scroll (supports window/iframes, documents and regular nodes)
73	$.fn.scrollable = function(){
74		return this.map(function(){
75			var elem = this,
76				isWin = !elem.nodeName || $.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) != -1;
77
78				if( !isWin )
79					return elem;
80
81			var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem;
82			
83			return  doc.compatMode == 'BackCompat' ?
84				doc.body : 
85				doc.documentElement;
86		});
87	};
88
89	$.fn.scrollTo = function( target, duration, settings ){
90		if( typeof duration == 'object' ){
91			settings = duration;
92			duration = 0;
93		}
94		if( typeof settings == 'function' )
95			settings = { onAfter:settings };
96			
97		if( target == 'max' )
98			target = 9e9;
99			
100		settings = $.extend( {}, $scrollTo.defaults, settings );
101		// Speed is still recognized for backwards compatibility
102		duration = duration || settings.speed || settings.duration;
103		// Make sure the settings are given right
104		settings.queue = settings.queue && settings.axis.length > 1;
105		
106		if( settings.queue )
107			// Let's keep the overall duration
108			duration /= 2;
109		settings.offset = both( settings.offset );
110		settings.over = both( settings.over );
111
112		return this.scrollable().each(function(){
113			var elem = this,
114				$elem = $(elem),
115				targ = target, toff, attr = {},
116				win = $elem.is('html,body');
117
118			switch( typeof targ ){
119				// A number will pass the regex
120				case 'number':
121				case 'string':
122					if( /^([+-]=)?\d+(\.\d+)?(px)?$/.test(targ) ){
123						targ = both( targ );
124						// We are done
125						break;
126					}
127					// Relative selector, no break!
128					targ = $(targ,this);
129				case 'object':
130					// DOMElement / jQuery
131					if( targ.is || targ.style )
132						// Get the real position of the target 
133						toff = (targ = $(targ)).offset();
134			}
135			$.each( settings.axis.split(''), function( i, axis ){
136				var Pos	= axis == 'x' ? 'Left' : 'Top',
137					pos = Pos.toLowerCase(),
138					key = 'scroll' + Pos,
139					old = elem[key],
140					Dim = axis == 'x' ? 'Width' : 'Height';

141
142				if( toff ){// jQuery / DOMElement
143					attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] );
144
145					// If it's a dom element, reduce the margin
146					if( settings.margin ){
147						attr[key] -= parseInt(targ.css('margin'+Pos)) || 0;
148						attr[key] -= parseInt(targ.css('border'+Pos+'Width')) || 0;
149					}
150					
151					attr[key] += settings.offset[pos] || 0;
152					
153					if( settings.over[pos] )
154						// Scroll to a fraction of its width/height
155						attr[key] += targ[Dim.toLowerCase()]() * settings.over[pos];
156				}else
157					attr[key] = targ[pos];
158
159				// Number or 'number'
160				if( /^\d+$/.test(attr[key]) )
161					// Check the limits
162					attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max(Dim) );
163
164				// Queueing axes
165				if( !i && settings.queue ){
166					// Don't waste time animating, if there's no need.
167					if( old != attr[key] )
168						// Intermediate animation
169						animate( settings.onAfterFirst );
170					// Don't animate this axis again in the next iteration.
171					delete attr[key];
172				}
173			});
174
175			animate( settings.onAfter );			
176
177			function animate( callback ){
178				$elem.animate( attr, duration, settings.easing, callback && function(){
179					callback.call(this, target, settings);
180				});
181			};
182
183			// Max scrolling position, works on quirks mode
184			// It only fails (not too badly) on IE, quirks mode.
185			function max( Dim ){
186				var scroll = 'scroll'+Dim;
187				
188				if( !win )
189					return elem[scroll];
190				
191				var size = 'client' + Dim,
192					html = elem.ownerDocument.documentElement,
193					body = elem.ownerDocument.body;
194
195				return Math.max( html[scroll], body[scroll] ) 
196					 - Math.min( html[size]  , body[size]   );
197					
198			};
199
200		}).end();
201	};
202
203	function both( val ){
204		return typeof val == 'object' ? val : { top:val, left:val };
205	};
206
207})( jQuery );