https://latinalista.com/wp-content/themes/ri-maxazine/js/jquery.sticky.js?ver=7.1.2

1// Sticky Plugin v1.0.2 for jQuery
2// =============
3// Author: Anthony Garand
4// Improvements by German M. Bravo (Kronuz) and Ruud Kamphuis (ruudk)
5// Improvements by Leonardo C. Daronco (daronco)
6// Created: 2/14/2011
7// Date: 16/04/2015
8// Website: http://labs.anthonygarand.com/sticky
9// Description: Makes an element on the page stick on the screen as you scroll
10//       It will only set the 'top' and 'position' of your element, you
11//       might need to adjust the width in some cases.
12
13(function($) {
14    var slice = Array.prototype.slice; // save ref to original slice()
15    var splice = Array.prototype.splice; // save ref to original slice()
16
17  var defaults = {
18      topSpacing: 0,
19      bottomSpacing: 0,
20      className: 'is-sticky',
21      wrapperClassName: 'sticky-wrapper',
22      center: false,
23      getWidthFrom: '',
24      widthFromWrapper: true, // works only when .getWidthFrom is empty
25      responsiveWidth: false
26    },
27    $window = $(window),
28    $document = $(document),
29    sticked = [],
30    windowHeight = $window.height(),
31    scroller = function() {
32      var scrollTop = $window.scrollTop(),
33        documentHeight = $document.height(),
34        dwh = documentHeight - windowHeight,
35        extra = (scrollTop > dwh) ? dwh - scrollTop : 0;
36
37      for (var i = 0; i < sticked.length; i++) {
38        var s = sticked[i],
39          elementTop = s.stickyWrapper.offset().top,
40          etse = elementTop - s.topSpacing - extra;
41
42        if (scrollTop <= etse) {
43          if (s.currentTop !== null) {
44            s.stickyElement
45              .css({
46                'width': '',
47                'position': '',
48                'top': ''
49              });
50            s.stickyElement.parent().removeClass(s.className);
51            s.stickyElement.trigger('sticky-end', [s]);
52            s.currentTop = null;
53          }
54        }
55        else {
56          var newTop = documentHeight - s.stickyElement.outerHeight()
57            - s.topSpacing - s.bottomSpacing - scrollTop - extra;
58          if (newTop < 0) {
59            newTop = newTop + s.topSpacing;
60          } else {
61            newTop = s.topSpacing;
62          }
63          if (s.currentTop != newTop) {
64            var newWidth;
65            if ( s.getWidthFrom ) {
66                newWidth = $(s.getWidthFrom).width() || null;
67            }
68            else if(s.widthFromWrapper) {
69                newWidth = s.stickyWrapper.width();
70            }
71            if ( newWidth == null ) {
72                newWidth = s.stickyElement.width();
73            }
74            s.stickyElement
75              .css('width', newWidth)
76              .css('position', 'fixed')
77              .css('top', newTop);
78
79            s.stickyElement.parent().addClass(s.className);
80
81            if (s.currentTop === null) {
82              s.stickyElement.trigger('sticky-start', [s]);
83            } else {
84              // sticky is started but it have to be repositioned
85              s.stickyElement.trigger('sticky-update', [s]);
86            }
87
88            if (s.currentTop === s.topSpacing && s.currentTop > newTop || s.currentTop === null && newTop < s.topSpacing) {
89              // just reached bottom || just started to stick but bottom is already reached
90              s.stickyElement.trigger('sticky-bottom-reached', [s]);
91            } else if(s.currentTop !== null && newTop === s.topSpacing && s.currentTop < newTop) {
92              // sticky is started && sticked at topSpacing && overflowing from top just finished
93              s.stickyElement.trigger('sticky-bottom-unreached', [s]);
94            }
95
96            s.currentTop = newTop;
97          }
98        }
99      }
100    },
101    resizer = function() {
102      windowHeight = $window.height();
103
104      for (var i = 0; i < sticked.length; i++) {
105        var s = sticked[i];
106        var newWidth = null;
107        if ( s.getWidthFrom ) {
108            if ( s.responsiveWidth === true ) {
109                newWidth = $(s.getWidthFrom).width();
110            }
111        }
112        else if(s.widthFromWrapper) {
113            newWidth = s.stickyWrapper.width();
114        }
115        if ( newWidth != null ) {
116            s.stickyElement.css('width', newWidth);
117        }
118      }
119    },
120    methods = {
121      init: function(options) {
122        var o = $.extend({}, defaults, options);
123        return this.each(function() {
124          var stickyElement = $(this);
125
126          var stickyId = stickyElement.attr('id');
127          var stickyHeight = stickyElement.outerHeight();
128          var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName
129          var wrapper = $('<div></div>')
130            .attr('id', wrapperId)
131            .addClass(o.wrapperClassName);
132
133          stickyElement.wrapAll(wrapper);
134
135          var stickyWrapper = stickyElement.parent();
136
137          if (o.center) {
138            stickyWrapper.css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});
139          }
140
141          if (stickyElement.css("float") == "right") {
142            stickyElement.css({"float":"none"}).parent().css({"float":"right"});
143          }
144
145          stickyWrapper.css('height', stickyHeight);
146
147          o.stickyElement = stickyElement;
148          o.stickyWrapper = stickyWrapper;
149          o.currentTop    = null;
150
151          sticked.push(o);
152        });
153      },
154      update: scroller,
155      unstick: function(options) {
156        return this.each(function() {
157          var that = this;
158          var unstickyElement = $(that);
159
160          var removeIdx = -1;
161          var i = sticked.length;
162          while ( i-- > 0 )
163          {
164            if (sticked[i].stickyElement.get(0) === that)
165            {
166                splice.call(sticked,i,1);
167                removeIdx = i;
168            }
169          }
170          if(removeIdx != -1)
171          {
172            unstickyElement.unwrap();
173            unstickyElement
174              .css({
175                'width': '',
176                'position': '',
177                'top': '',
178                'float': ''
179              })
180            ;
181          }
182        });
183      }
184    };
185
186  // should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
187  if (window.addEventListener) {
188    window.addEventListener('scroll', scroller, false);
189    window.addEventListener('resize', resizer, false);
190  } else if (window.attachEvent) {
191    window.attachEvent('onscroll', scroller);
192    window.attachEvent('onresize', resizer);
193  }
194
195  $.fn.sticky = function(method) {
196    if (methods[method]) {
197      return methods[method].apply(this, slice.call(arguments, 1));
198    } else if (typeof method === 'object' || !method ) {
199      return methods.init.apply( this, arguments );
200    } else {
201      $.error('Method ' + method + ' does not exist on jQuery.sticky');
202    }
203  };
204
205  $.fn.unstick = function(method) {
206    if (methods[method]) {
207      return methods[method].apply(this, slice.call(arguments, 1));
208    } else if (typeof method === 'object' || !method ) {
209      return methods.unstick.apply( this, arguments );
210    } else {
211      $.error('Method ' + method + ' does not exist on jQuery.sticky');
212    }
213
214  };
215  $(function() {
216    setTimeout(scroller, 0);
217  });
218})(jQuery);