https://www.mistoprodeje.cz/wp-content/themes/timesnews/assets/library/sticky/jquery.sticky.js?ver=7.1.2

1// Sticky Plugin v1.0.4 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: 02/14/2011
7// Date: 07/20/2015
8// Website: http://stickyjs.com/
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 (factory) {
14  if (typeof define === 'function' && define.amd) {
15      // AMD. Register as an anonymous module.
16      define(['jquery'], factory);
17  } else if (typeof module === 'object' && module.exports) {
18      // Node/CommonJS
19      module.exports = factory(require('jquery'));
20  } else {
21      // Browser globals
22      factory(jQuery);
23  }
24}(function ($) {
25  var slice = Array.prototype.slice; // save ref to original slice()
26  var splice = Array.prototype.splice; // save ref to original slice()
27
28var defaults = {
29    topSpacing: 0,
30    bottomSpacing: 0,
31    className: 'is-sticky',
32    wrapperClassName: 'sticky-wrapper',
33    center: false,
34    getWidthFrom: '',
35    widthFromWrapper: true, // works only when .getWidthFrom is empty
36    responsiveWidth: false,
37    zIndex: 'inherit'
38  },
39  $window = $(window),
40  $document = $(document),
41  sticked = [],
42  windowHeight = $window.height(),
43  scroller = function() {
44    var scrollTop = $window.scrollTop(),
45      documentHeight = $document.height(),
46      dwh = documentHeight - windowHeight,
47      extra = (scrollTop > dwh) ? dwh - scrollTop : 0;
48
49    for (var i = 0, l = sticked.length; i < l; i++) {
50      var s = sticked[i],
51        elementTop = s.stickyWrapper.offset().top,
52        etse = elementTop - s.topSpacing - extra;
53
54      //update height in case of dynamic content
55      s.stickyWrapper.css('height', s.stickyElement.outerHeight());
56
57      if (scrollTop <= etse) {
58        if (s.currentTop !== null) {
59          s.stickyElement
60            .css({
61              'width': '',
62              'position': '',
63              'top': '',
64              'z-index': ''
65            });
66          s.stickyElement.parent().removeClass(s.className);
67          s.stickyElement.trigger('sticky-end', [s]);
68          s.currentTop = null;
69        }
70      }
71      else {
72        var newTop = documentHeight - s.stickyElement.outerHeight()
73          - s.topSpacing - s.bottomSpacing - scrollTop - extra;
74        if (newTop < 0) {
75          newTop = newTop + s.topSpacing;
76        } else {
77          newTop = s.topSpacing;
78        }
79        if (s.currentTop !== newTop) {
80          var newWidth;
81          if (s.getWidthFrom) {
82              padding =  s.stickyElement.innerWidth() - s.stickyElement.width();
83              newWidth = $(s.getWidthFrom).width() - padding || null;
84          } else if (s.widthFromWrapper) {
85              newWidth = s.stickyWrapper.width();
86          }
87          if (newWidth == null) {
88              newWidth = s.stickyElement.width();
89          }
90          s.stickyElement
91            .css('width', newWidth)
92            .css('position', 'fixed')
93            .css('top', newTop)
94            .css('z-index', s.zIndex);
95
96          s.stickyElement.parent().addClass(s.className);
97
98          if (s.currentTop === null) {
99            s.stickyElement.trigger('sticky-start', [s]);
100          } else {
101            // sticky is started but it have to be repositioned
102            s.stickyElement.trigger('sticky-update', [s]);
103          }
104
105          if (s.currentTop === s.topSpacing && s.currentTop > newTop || s.currentTop === null && newTop < s.topSpacing) {
106            // just reached bottom || just started to stick but bottom is already reached
107            s.stickyElement.trigger('sticky-bottom-reached', [s]);
108          } else if(s.currentTop !== null && newTop === s.topSpacing && s.currentTop < newTop) {
109            // sticky is started && sticked at topSpacing && overflowing from top just finished
110            s.stickyElement.trigger('sticky-bottom-unreached', [s]);
111          }
112
113          s.currentTop = newTop;
114        }
115
116        // Check if sticky has reached end of container and stop sticking
117        var stickyWrapperContainer = s.stickyWrapper.parent();
118        var unstick = (s.stickyElement.offset().top + s.stickyElement.outerHeight() >= stickyWrapperContainer.offset().top + stickyWrapperContainer.outerHeight()) && (s.stickyElement.offset().top <= s.topSpacing);
119
120        if( unstick ) {
121          s.stickyElement
122            .css('position', 'absolute')
123            .css('top', '')
124            .css('bottom', 0)
125            .css('z-index', '');
126        } else {
127          s.stickyElement
128            .css('position', 'fixed')
129            .css('top', newTop)
130            .css('bottom', '')
131            .css('z-index', s.zIndex);
132        }
133      }
134    }
135  },
136  resizer = function() {
137    windowHeight = $window.height();
138
139    for (var i = 0, l = sticked.length; i < l; i++) {
140      var s = sticked[i];
141      var newWidth = null;
142      if (s.getWidthFrom) {
143          if (s.responsiveWidth) {
144              newWidth = $(s.getWidthFrom).width();
145          }
146      } else if(s.widthFromWrapper) {
147          newWidth = s.stickyWrapper.width();
148      }
149      if (newWidth != null) {
150          s.stickyElement.css('width', newWidth);
151      }
152    }
153  },
154  methods = {
155    init: function(options) {
156      return this.each(function() {
157        var o = $.extend({}, defaults, options);
158        var stickyElement = $(this);
159
160        var stickyId = stickyElement.attr('id');
161        var wrapperId = stickyId ? stickyId + '-' + defaults.wrapperClassName : defaults.wrapperClassName;
162        var wrapper = $('<div></div>')
163          .attr('id', wrapperId)
164          .addClass(o.wrapperClassName);
165
166        stickyElement.wrapAll(function() {
167          if ($(this).parent("#" + wrapperId).length == 0) {
168                  return wrapper;
169          }
170});
171
172        var stickyWrapper = stickyElement.parent();
173
174        if (o.center) {
175          stickyWrapper.css({width:stickyElement.outerWidth(),marginLeft:"auto",marginRight:"auto"});
176        }
177
178        if (stickyElement.css("float") === "right") {
179          stickyElement.css({"float":"none"}).parent().css({"float":"right"});
180        }
181
182        o.stickyElement = stickyElement;
183        o.stickyWrapper = stickyWrapper;
184        o.currentTop    = null;
185
186        sticked.push(o);
187
188        methods.setWrapperHeight(this);
189        methods.setupChangeListeners(this);
190      });
191    },
192
193    setWrapperHeight: function(stickyElement) {
194      var element = $(stickyElement);
195      var stickyWrapper = element.parent();
196      if (stickyWrapper) {
197        stickyWrapper.css('height', element.outerHeight());
198      }
199    },
200
201    setupChangeListeners: function(stickyElement) {
202      if (window.MutationObserver) {
203        var mutationObserver = new window.MutationObserver(function(mutations) {
204          if (mutations[0].addedNodes.length || mutations[0].removedNodes.length) {
205            methods.setWrapperHeight(stickyElement);
206          }
207        });
208        mutationObserver.observe(stickyElement, {subtree: true, childList: true});
209      } else {
210        if (window.addEventListener) {
211          stickyElement.addEventListener('DOMNodeInserted', function() {
212            methods.setWrapperHeight(stickyElement);
213          }, false);
214          stickyElement.addEventListener('DOMNodeRemoved', function() {
215            methods.setWrapperHeight(stickyElement);
216          }, false);
217        } else if (window.attachEvent) {
218          stickyElement.attachEvent('onDOMNodeInserted', function() {
219            methods.setWrapperHeight(stickyElement);
220          });
221          stickyElement.attachEvent('onDOMNodeRemoved', function() {
222            methods.setWrapperHeight(stickyElement);
223          });
224        }
225      }
226    },
227    update: scroller,
228    unstick: function(options) {
229      return this.each(function() {
230        var that = this;
231        var unstickyElement = $(that);
232
233        var removeIdx = -1;
234        var i = sticked.length;
235        while (i-- > 0) {
236          if (sticked[i].stickyElement.get(0) === that) {
237              splice.call(sticked,i,1);
238              removeIdx = i;
239          }
240        }
241        if(removeIdx !== -1) {
242          unstickyElement.unwrap();
243          unstickyElement
244            .css({
245              'width': '',
246              'position': '',
247              'top': '',
248              'float': '',
249              'z-index': ''
250            })
251          ;
252        }
253      });
254    }
255  };
256
257// should be more efficient than using $window.scroll(scroller) and $window.resize(resizer):
258if (window.addEventListener) {
259  window.addEventListener('scroll', scroller, false);
260  window.addEventListener('resize', resizer, false);
261} else if (window.attachEvent) {
262  window.attachEvent('onscroll', scroller);
263  window.attachEvent('onresize', resizer);
264}
265
266$.fn.sticky = function(method) {
267  if (methods[method]) {
268    return methods[method].apply(this, slice.call(arguments, 1));
269  } else if (typeof method === 'object' || !method ) {
270    return methods.init.apply( this, arguments );
271  } else {
272    $.error('Method ' + method + ' does not exist on jQuery.sticky');
273  }
274};
275
276$.fn.unstick = function(method) {
277  if (methods[method]) {
278    return methods[method].apply(this, slice.call(arguments, 1));
279  } else if (typeof method === 'object' || !method ) {
280    return methods.unstick.apply( this, arguments );
281  } else {
282    $.error('Method ' + method + ' does not exist on jQuery.sticky');
283  }
284};
285$(function() {
286  setTimeout(scroller, 0);
287});
288}));