https://uruguay360.com.uy/js/jquery.jscroll.js

1// ####################################################################################
2// #######                                                                      #######
3// ####### Plugin:      jScroll                                                 #######
4// ####### Author:      William Duffy                                           #######
5// ####### Website:     http://www.wduffy.co.uk/jScroll                         #######
6// ####### Version:     1.1	                                                    #######
7// #######                                                                      #######
8// ####### Copyright (c) 2011, William Duffy - www.wduffy.co.uk                 #######
9// #######                                                                      #######
10// ####### Permission is hereby granted, free of charge, to any person          #######
11// ####### obtaining a copy of this software and associated documentation       #######
12// ####### files (the "Software"), to deal in the Software without              #######
13// ####### restriction, including without limitation the rights to use,         #######
14// ####### copy, modify, merge, publish, distribute, sublicense, and/or sell    #######
15// ####### copies of the Software, and to permit persons to whom the            #######
16// ####### Software is furnished to do so, subject to the following             #######
17// ####### conditions:                                                          #######
18// #######                                                                      #######
19// ####### The above copyright notice and this permission notice shall be       #######
20// ####### included in all copies or substantial portions of the Software.      #######
21// #######                                                                      #######
22// ####### THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,      #######
23// ####### EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES      #######
24// ####### OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND             #######
25// ####### NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT          #######
26// ####### HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,         #######
27// ####### WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING         #######
28// ####### FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR        #######
29// ####### OTHER DEALINGS IN THE SOFTWARE.                                      #######
30// #######                                                                      #######
31// ####################################################################################
32(function($) {
33
34    // Public: jScroll Plugin
35    $.fn.jScroll = function(options) {
36
37        var opts = $.extend({}, $.fn.jScroll.defaults, options);
38
39        return this.each(function() {
40            var $element = $(this);
41            var $window = $(window);
42            var locator = new location($element);
43            var didScroll = false;
44            var timer = false;
45
46            // http://ejohn.org/blog/learning-from-twitter/
47            $(window).scroll(function() {
48                if(!didScroll) {
49                    timer = setInterval(function() {
50                        if ( didScroll ) {
51                            didScroll = false;
52                            clearTimeout(timer);
53                            $element
54                            .stop()
55                            .animate(locator.getMargin($window), opts.speed);
56                        }
57                    }, 250);
58                }
59                didScroll = true;
60            });
61        });
62
63        // Private
64        function location($element)
65        {
66            this.min = $element.offset().top;
67            this.originalMargin = parseInt($element.css("margin-top"), 10) || 0;
68
69            this.getMargin = function ($window)
70            {
71                var max = $element.parent().height() - $element.outerHeight();
72                var margin = this.originalMargin;
73
74                if ($window.scrollTop() >= this.min - opts.top)
75                    margin = margin + opts.top + $window.scrollTop() - this.min;
76
77                if (margin > max)
78                    margin = max;
79
80                return ({"marginTop" : margin + 'px'});
81            }
82        }
83
84    };
85
86    // Public: Default values
87    $.fn.jScroll.defaults = {
88        speed   :   "slow",
89        top     :   10
90    };
91
92})(jQuery);