https://www.buzzsneakers.mk/nb-public/themes/nbshop5_v5_8/_static/…/jquery-scrolltofixed.js?ver=1008_7.1

1/*
2 * ScrollToFixed
3 * https://github.com/bigspotteddog/ScrollToFixed
4 * Copyright (c) 2011 Joseph Cava-Lynch
5 * MIT license
6 */
7(function($) {
8    $.isScrollToFixed = function(el) {
9        return !!$(el).data('ScrollToFixed');
10    };
11
12    $.ScrollToFixed = function(el, options) {
13        // To avoid scope issues, use 'base' instead of 'this' to reference this
14        // class from internal events and functions.
15        var base = this;
16
17        // Access to jQuery and DOM versions of element.
18        base.$el = $(el);
19        base.el = el;
20
21        // Add a reverse reference to the DOM object.
22        base.$el.data('ScrollToFixed', base);
23
24        // A flag so we know if the scroll has been reset.
25        var isReset = false;
26
27        // The element that was given to us to fix if scrolled above the top of
28        // the page.
29        var target = base.$el;
30
31        var position;
32        var originalPosition;
33        var originalOffsetTop;
34        var originalZIndex;
35
36        // The offset top of the element when resetScroll was called. This is
37        // used to determine if we have scrolled past the top of the element.
38        var offsetTop = 0;
39
40        // The offset left of the element when resetScroll was called. This is
41        // used to move the element left or right relative to the horizontal
42        // scroll.
43        var offsetLeft = 0;
44        var originalOffsetLeft = -1;
45
46        // This last offset used to move the element horizontally. This is used
47        // to determine if we need to move the element because we would not want
48        // to do that for no reason.
49        var lastOffsetLeft = -1;
50
51        // This is the element used to fill the void left by the target element
52        // when it goes fixed; otherwise, everything below it moves up the page.
53        var spacer = null;
54
55        var spacerClass;
56
57        var className;
58
59        // Capture the original offsets for the target element. This needs to be
60        // called whenever the page size changes or when the page is first
61        // scrolled. For some reason, calling this before the page is first
62        // scrolled causes the element to become fixed too late.
63        function resetScroll() {
64            // Set the element to it original positioning.
65            target.trigger('preUnfixed.ScrollToFixed');
66            setUnfixed();
67            target.trigger('unfixed.ScrollToFixed');
68
69            // Reset the last offset used to determine if the page has moved
70            // horizontally.
71            lastOffsetLeft = -1;
72
73            // Capture the offset top of the target element.
74            offsetTop = target.offset().top;
75
76            // Capture the offset left of the target element.
77            offsetLeft = target.offset().left;
78
79            // If the offsets option is on, alter the left offset.
80            if (base.options.offsets) {
81                offsetLeft += (target.offset().left - target.position().left);
82            }
83
84            if (originalOffsetLeft == -1) {
85                originalOffsetLeft = offsetLeft;
86            }
87
88            position = target.css('position');
89
90            // Set that this has been called at least once.
91            isReset = true;
92
93            if (base.options.bottom != -1) {
94                target.trigger('preFixed.ScrollToFixed');
95                setFixed();
96                target.trigger('fixed.ScrollToFixed');
97            }
98        }
99
100        function getLimit() {
101            var limit = base.options.limit;
102            if (!limit) return 0;
103
104            if (typeof(limit) === 'function') {
105                return limit.apply(target);
106            }
107            return limit;
108        }
109
110        // Returns whether the target element is fixed or not.
111        function isFixed() {
112            return position === 'fixed';
113        }
114
115        // Returns whether the target element is absolute or not.
116        function isAbsolute() {
117            return position === 'absolute';
118        }
119
120        function isUnfixed() {
121            return !(isFixed() || isAbsolute());
122        }
123
124        // Sets the target element to fixed. Also, sets the spacer to fill the
125        // void left by the target element.
126        function setFixed() {
127            // Only fix the target element and the spacer if we need to.
128            if (!isFixed()) {
129                // Set the spacer to fill the height and width of the target

181); };
182
183            target.css(cssOptions);
184
185            position = 'absolute';
186        }
187
188        // Sets the target element back to unfixed. Also, hides the spacer.
189        function setUnfixed() {
190            // Only unfix the target element and the spacer if we need to.
191            if (!isUnfixed()) {
192                lastOffsetLeft = -1;
193
194                // Hide the spacer now that the target element will fill the
195                // space.
196                spacer.css('display', 'none');
197
198                // Remove the style attributes that were added to the target.
199                // This will reverse the target back to the its original style.
200                target.css({
201                    'z-index' : originalZIndex,
202                    'width' : '',
203                    'position' : originalPosition,
204                    'left' : '',
205                    'top' : originalOffsetTop,
206                    'margin-left' : ''
207                });
208
209                target.removeClass('scroll-to-fixed-fixed');
210
211                if (base.options.className) {
212                    target.removeClass(base.options.className);
213                }
214
215                position = null;
216            }
217        }
218
219        // Moves the target element left or right relative to the horizontal
220        // scroll position.
221        function setLeft(x) {
222            // Only if the scroll is not what it was last time we did this.
223            if (x != lastOffsetLeft) {
224                // Move the target element horizontally relative to its original
225                // horizontal position.
226                target.css('left', offsetLeft - x);
227
228                // Hold the last horizontal position set.
229                lastOffsetLeft = x;
230            }
231        }
232
233        function getMarginTop() {
234            var marginTop = base.options.marginTop;
235            if (!marginTop) return 0;
236
237            if (typeof(marginTop) === 'function') {
238                return marginTop.apply(target);
239            }
240            return marginTop;
241        }
242
243        // Checks to see if we need to do something based on new scroll position
244        // of the page.
245        function checkScroll() {
246            if (!$.isScrollToFixed(target)) return;
247            var wasReset = isReset;
248
249            // If resetScroll has not yet been called, call it. This only
250            // happens once.
251            if (!isReset) {
252                resetScroll();
253            } else if (isUnfixed()) {
254                // if the offset has changed since the last scroll,
255                // we need to get it again.
256
257                // Capture the offset top of the target element.
258                offsetTop = target.offset().top;
259
260                // Capture the offset left of the target element.
261                offsetLeft = target.offset().left;
262            }
263
264            // Grab the current horizontal scroll position.
265            var x = $(window).scrollLeft();
266
267            // Grab the current vertical scroll position.
268            var y = $(window).scrollTop();
269
270            // Get the limit, if there is one.
271            var limit = getLimit();
272
273            // If the vertical scroll position, plus the optional margin, would
274            // put the target element at the specified limit, set the target
275            // element to absolute.
276            if (base.options.minWidth && $(window).width() < base.options.minWidth) {
277                if (!isUnfixed() || !wasReset) {
278                    postPosition();
279                    target.trigger('preUnfixed.ScrollToFixed');
280                    setUnfixed();
281                    target.trigger('unfixed.ScrollToFixed');
282                }
283            } else if (base.options.maxWidth && $(window).width() > base.options.maxWidth) {
284                if (!isUnfixed() || !wasReset) {
285                    postPosition();
286                    target.trigger('preUnfixed.ScrollToFixed');
287                    setUnfixed();
288                    target.trigger('unfixed.ScrollToFixed');
289                }
290            } else if (base.options.bottom == -1) {
291                // If the vertical scroll position, plus the optional margin, would
292                // put the target element at the specified limit, set the target
293                // element to absolute.
294                if (limit > 0 && y >= limit - getMarginTop()) {
295                    if (!isAbsolute() || !wasReset) {
296                        postPosition();
297                        target.trigger('preAbsolute.ScrollToFixed');
298                        setAbsolute();
299                        target.trigger('unfixed.ScrollToFixed');
300                    }
301                // If the vertical scroll position, plus the optional margin, would
302                // put the target element above the top of the page, set the target
303                // element to fixed.
304                } else if (y >= offsetTop - getMarginTop()) {
305                    if (!isFixed() || !wasReset) {
306                        postPosition();
307                        target.trigger('preFixed.ScrollToFixed');
308
309                        // Set the target element to fixed.
310                        setFixed();
311
312                        // Reset the last offset left because we just went fixed.
313                        lastOffsetLeft = -1;
314
315                        target.trigger('fixed.ScrollToFixed');
316                    }
317                    // If the page has been scrolled horizontally as well, move the
318                    // target element accordingly.
319                    setLeft(x);
320                } else {
321                    // Set the target element to unfixed, placing it where it was
322                    // before.
323                    if (!isUnfixed() || !wasReset) {
324                        postPosition();
325                        target.trigger('preUnfixed.ScrollToFixed');
326                        setUnfixed();
327                        target.trigger('unfixed.ScrollToFixed');
328                    }
329                }
330            } else {
331                if (limit > 0) {
332                    if (y + $(window).height() - target.outerHeight(true) >= limit - (getMarginTop() || -getBottom())) {
333                        if (isFixed()) {
334                            postPosition();
335                            target.trigger('preUnfixed.ScrollToFixed');
336
337                            if (originalPosition === 'absolute') {
338                                setAbsolute();
339                            } else {
340                                setUnfixed();
341                            }
342
343                            target.trigger('unfixed.ScrollToFixed');
344                        }
345                    } else {
346                        if (!isFixed()) {
347                            postPosition();
348                            target.trigger('preFixed.ScrollToFixed');
349                            setFixed();
350                        }
351                        setLeft(x);
352                        target.trigger('fixed.ScrollToFixed');
353                    }
354                } else {
355                    setLeft(x);
356                }
357            }
358        }
359
360        function getBottom() {
361            if (!base.options.bottom) return 0;
362            return base.options.bottom;
363        }
364
365        function postPosition() {
366            var position = target.css('position');
367
368            if (position == 'absolute') {
369                target.trigger('postAbsolute.ScrollToFixed');
370            } else if (position == 'fixed') {
371                target.trigger('postFixed.ScrollToFixed');
372            } else {
373                target.trigger('postUnfixed.ScrollToFixed');
374            }
375        }
376
377        var windowResize = function(event) {
378            // Check if the element is visible before updating it's position, which
379            // improves behavior with responsive designs where this element is hidden.
380            if(target.is(':visible')) {
381                isReset = false;
382                checkScroll();
383            }
384        }
385
386        var windowScroll = function(event) {
387            (!!window.requestAnimationFrame) ? requestAnimationFrame(checkScroll) : checkScroll();
388        }
389
390        // From: http://kangax.github.com/cft/#IS_POSITION_FIXED_SUPPORTED
391        var isPositionFixedSupported = function() {
392            var container = document.body;
393
394            if (document.createElement && container && container.appendChild && container.removeChild) {
395                var el = document.createElement('div');
396
397                if (!el.getBoundingClientRect) return null;
398
399                el.innerHTML = 'x';
400                el.style.cssText = 'position:fixed;top:100px;';
401                container.appendChild(el);
402
403                var originalHeight = container.style.height,
404                originalScrollTop = container.scrollTop;
405
406                container.style.height = '3000px';
407                container.scrollTop = 500;
408
409                var elementTop = el.getBoundingClientRect().top;
410                container.style.height = originalHeight;
411
412                var isSupported = (elementTop === 100);
413                container.removeChild(el);
414                container.scrollTop = originalScrollTop;
415
416                return isSupported;
417            }
418
419            return null;
420        }
421
422        var preventDefault = function(e) {
423            e = e || window.event;
424            if (e.preventDefault) {
425                e.preventDefault();
426            }
427            e.returnValue = false;
428        }
429
430        // Initializes this plugin. Captures the options passed in, turns this
431        // off for devices that do not support fixed position, adds the spacer,
432        // and binds to the window scroll and resize events.
433        base.init = function() {
434            // Capture the options for this plugin.
435            base.options = $.extend({}, $.ScrollToFixed.defaultOptions, options);
436
437            originalZIndex = target.css('z-index')
438
439            // Turn off this functionality for devices that do not support it.
440            // if (!(base.options && base.options.dontCheckForPositionFixedSupport)) {
441            //     var fixedSupported = isPositionFixedSupported();
442            //     if (!fixedSupported) return;
443            // }
444
445            // Put the target element on top of everything that could be below
446            // it. This reduces flicker when the target element is transitioning
447            // to fixed.
448            base.$el.css('z-index', base.options.zIndex);
449
450            // Create a spacer element to fill the void left by the target
451            // element when it goes fixed.
452            spacer = $('<div />');
453
454            position = target.css('position');
455            originalPosition = target.css('position');
456
457            originalOffsetTop = target.css('top');
458
459            // Place the spacer right after the target element.
460            if (isUnfixed()) base.$el.after(spacer);
461
462            // Reset the target element offsets when the window is resized, then
463            // check to see if we need to fix or unfix the target element.
464            $(window).bind('resize.ScrollToFixed', windowResize);
465
466            // When the window scrolls, check to see if we need to fix or unfix
467            // the target element.
468            $(window).bind('scroll.ScrollToFixed', windowScroll);
469
470            // For touch devices, call checkScroll directlly rather than
471            // rAF wrapped windowScroll to animate the element
472            if ('ontouchmove' in window) {
473              $(window).bind('touchmove.ScrollToFixed', checkScroll);
474            }
475
476            if (base.options.preFixed) {
477                target.bind('preFixed.ScrollToFixed', base.options.preFixed);
478            }
479            if (base.options.postFixed) {
480                target.bind('postFixed.ScrollToFixed', base.options.postFixed);
481            }
482            if (base.options.preUnfixed) {
483                target.bind('preUnfixed.ScrollToFixed', base.options.preUnfixed);
484            }
485            if (base.options.postUnfixed) {
486                target.bind('postUnfixed.ScrollToFixed', base.options.postUnfixed);
487            }
488            if (base.options.preAbsolute) {
489                target.bind('preAbsolute.ScrollToFixed', base.options.preAbsolute);
490            }
491            if (base.options.postAbsolute) {
492                target.bind('postAbsolute.ScrollToFixed', base.options.postAbsolute);
493            }
494            if (base.options.fixed) {
495                target.bind('fixed.ScrollToFixed', base.options.fixed);
496            }
497            if (base.options.unfixed) {
498                target.bind('unfixed.ScrollToFixed', base.options.unfixed);
499            }
500
501            if (base.options.spacerClass) {
502                spacer.addClass(base.options.spacerClass);
503            }
504
505            target.bind('resize.ScrollToFixed', function() {
506                spacer.height(target.height());
507            });
508
509            target.bind('scroll.ScrollToFixed', function() {
510                target.trigger('preUnfixed.ScrollToFixed');
511                setUnfixed();
512                target.trigger('unfixed.ScrollToFixed');
513                checkScroll();
514            });
515
516            target.bind('detach.ScrollToFixed', function(ev) {
517                preventDefault(ev);
518
519                target.trigger('preUnfixed.ScrollToFixed');
520                setUnfixed();
521                target.trigger('unfixed.ScrollToFixed');
522
523                $(window).unbind('resize.ScrollToFixed', windowResize);
524                $(window).unbind('scroll.ScrollToFixed', windowScroll);
525
526                target.unbind('.ScrollToFixed');
527
528                //remove spacer from dom
529                spacer.remove();
530
531                base.$el.removeData('ScrollToFixed');
532            });
533
534            // Reset everything.
535            windowResize();
536        };
537
538        // Initialize the plugin.
539        base.init();
540    };
541
542    // Sets the option defaults.
543    $.ScrollToFixed.defaultOptions = {
544        marginTop : 0,
545        limit : 0,
546        bottom : -1,
547        zIndex : 1000,
548        baseClassName: 'scroll-to-fixed-fixed'
549    };
550
551    // Returns enhanced elements that will fix to the top of the page when the
552    // page is scrolled.
553    $.fn.scrollToFixed = function(options) {
554        return this.each(function() {
555            (new $.ScrollToFixed(this, options));
556        });
557    };
558})(jQuery);