https://sion.ed.cr/assets/plugins/smooth-scroll/jquery.smooth-scroll.js

1(function($) {
2  var version = '2.0.1';
3  var optionOverrides = {};
4  var defaults = {
5    exclude: [],
6    excludeWithin: [],
7    offset: 0,
8
9    // one of 'top' or 'left'
10    direction: 'top',
11
12    // if set, bind click events through delegation
13    //  supported since jQuery 1.4.2
14    delegateSelector: null,
15
16    // jQuery set of elements you wish to scroll (for $.smoothScroll).
17    //  if null (default), $('html, body').firstScrollable() is used.
18    scrollElement: null,
19
20    // only use if you want to override default behavior
21    scrollTarget: null,
22
23    // fn(opts) function to be called before scrolling occurs.
24    // `this` is the element(s) being scrolled
25    beforeScroll: function() {},
26
27    // fn(opts) function to be called after scrolling occurs.
28    // `this` is the triggering element
29    afterScroll: function() {},
30
31    // easing name. jQuery comes with "swing" and "linear." For others, you'll need an easing plugin
32    // from jQuery UI or elsewhere
33    easing: 'swing',
34
35    // speed can be a number or 'auto'
36    // if 'auto', the speed will be calculated based on the formula:
37    // (current scroll position - target scroll position) / autoCoeffic
38    speed: 400,
39
40    // coefficient for "auto" speed
41    autoCoefficient: 2,
42
43    // $.fn.smoothScroll only: whether to prevent the default click action
44    preventDefault: true
45  };
46
47  var getScrollable = function(opts) {
48    var scrollable = [];
49    var scrolled = false;
50    var dir = opts.dir && opts.dir === 'left' ? 'scrollLeft' : 'scrollTop';
51
52    this.each(function() {
53      var el = $(this);
54
55      if (this === document || this === window) {
56        return;
57      }
58
59      if (document.scrollingElement && (this === document.documentElement || this === document.body)) {
60        scrollable.push(document.scrollingElement);
61
62        return false;
63      }
64
65      if (el[dir]() > 0) {
66        scrollable.push(this);
67      } else {
68        // if scroll(Top|Left) === 0, nudge the element 1px and see if it moves
69        el[dir](1);
70        scrolled = el[dir]() > 0;
71
72        if (scrolled) {
73          scrollable.push(this);
74        }
75        // then put it back, of course
76        el[dir](0);
77      }
78    });
79
80    if (!scrollable.length) {
81      this.each(function() {
82        // If no scrollable elements and <html> has scroll-behavior:smooth because
83        // "When this property is specified on the root element, it applies to the viewport instead."
84        // and "The scroll-behavior property of the … body element is *not* propagated to the viewport."
85        // → https://drafts.csswg.org/cssom-view/#propdef-scroll-behavior
86        if (this === document.documentElement && $(this).css('scrollBehavior') === 'smooth') {
87          scrollable = [this];
88        }
89
90        // If still no scrollable elements, fall back to <body>,
91        // if it's in the jQuery collection
92        // (doing this because Safari sets scrollTop async,
93        // so can't set it to 1 and immediately get the value.)
94        if (!scrollable.length && this.nodeName === 'BODY') {
95          scrollable = [this];
96        }
97      });
98    }
99
100    // Use the first scrollable element if we're calling firstScrollable()
101    if (opts.el === 'first' && scrollable.length > 1) {
102      scrollable = [scrollable[0]];
103    }
104
105    return scrollable;
106  };
107
108  $.fn.extend({
109    scrollable: function(dir) {
110      var scrl = getScrollable.call(this, {dir: dir});
111
112      return this.pushStack(scrl);
113    },
114    firstScrollable: function(dir) {
115      var scrl = getScrollable.call(this, {el: 'first', dir: dir});
116
117      return this.pushStack(scrl);
118    },
119
120    smoothScroll: function(options, extra) {
121      options = options || {};
122
123      if (options === 'options') {
124        if (!extra) {
125          return this.first().data('ssOpts');
126        }
127
128        return this.each(function() {
129          var $this = $(this);
130          var opts = $.extend($this.data('ssOpts') || {}, extra);
131
132          $(this).data('ssOpts', opts);
133        });
134      }
135
136      var opts = $.extend({}, $.fn.smoothScroll.defaults, options);
137
138      var clickHandler = function(event) {
139        var escapeSelector = function(str) {
140          return str.replace(/(:|\.|\/)/g, '\\$1');
141        };
142
143        var link = this;
144        var $link = $(this);
145        var thisOpts = $.extend({}, opts, $link.data('ssOpts') || {});
146        var exclude = opts.exclude;
147        var excludeWithin = thisOpts.excludeWithin;
148        var elCounter = 0;
149        var ewlCounter = 0;
150        var include = true;
151        var clickOpts = {};
152        var locationPath = $.smoothScroll.filterPath(location.pathname);
153        var linkPath = $.smoothScroll.filterPath(link.pathname);
154        var hostMatch = location.hostname === link.hostname || !link.hostname;
155        var pathMatch = thisOpts.scrollTarget || (linkPath === locationPath);
156        var thisHash = escapeSelector(link.hash);
157
158        if (thisHash && !$(thisHash).length) {
159          include = false;