https://www.dslrentals.com/wp-content/themes/total/js/jquery.nav.js?ver=1.0

1/*
2 * jQuery One Page Nav Plugin
3 * http://github.com/davist11/jQuery-One-Page-Nav
4 *
5 * Copyright (c) 2010 Trevor Davis (http://trevordavis.net)
6 * Dual licensed under the MIT and GPL licenses.
7 * Uses the same license as jQuery, see:
8 * http://jquery.org/license
9 *
10 * @version 3.0.0
11 *
12 * Example usage:
13 * $('#nav').onePageNav({
14 *   currentClass: 'current',
15 *   changeHash: false,
16 *   scrollSpeed: 750
17 * });
18 */
19
20;
21(function ($, window, document, undefined) {
22
23    // our plugin constructor
24    var OnePageNav = function (elem, options) {
25        this.elem = elem;
26        this.$elem = $(elem);
27        this.options = options;
28        this.metadata = this.$elem.data('plugin-options');
29        this.$win = $(window);
30        this.sections = {};
31        this.didScroll = false;
32        this.$doc = $(document);
33        this.docHeight = this.$doc.height();
34    };
35
36    // the plugin prototype
37    OnePageNav.prototype = {
38        defaults: {
39            navItems: 'a[href*="#"]',
40            currentClass: 'current',
41            changeHash: false,
42            easing: 'swing',
43            filter: '',
44            scrollSpeed: 750,
45            scrollOffset: 0,
46            scrollThreshold: 0.5,
47            begin: false,
48            end: false,
49            scrollChange: false
50        },
51
52        init: function () {
53            // Introduce defaults that can be extended either
54            // globally or using an object literal.
55            this.config = $.extend({}, this.defaults, this.options, this.metadata);
56
57            this.$nav = this.$elem.find(this.config.navItems);
58
59            //Filter any links out of the nav
60            if (this.config.filter !== '') {
61                this.$nav = this.$nav.filter(this.config.filter);
62            }
63
64            //Handle clicks on the nav
65            this.$nav.on('click.onePageNav', $.proxy(this.handleClick, this));
66
67            //Get the section positions
68            this.getPositions();
69
70            //Handle scroll changes
71            this.bindInterval();
72
73            //Update the positions on resize too
74            this.$win.on('resize.onePageNav', $.proxy(this.getPositions, this));
75
76            return this;
77        },
78
79        adjustNav: function (self, $parent) {
80            self.$elem.find('.' + self.config.currentClass).removeClass(self.config.currentClass);
81            $parent.addClass(self.config.currentClass);
82        },
83
84        bindInterval: function () {
85            var self = this;
86            var docHeight;
87
88            self.$win.on('scroll.onePageNav', function () {
89                self.didScroll = true;
90            });
91
92            self.t = setInterval(function () {
93                docHeight = self.$doc.height();
94
95                //If it was scrolled
96                if (self.didScroll) {
97                    self.didScroll = false;
98                    self.scrollChange();
99                }
100
101                //If the document height changes
102                if (docHeight !== self.docHeight) {
103                    self.docHeight = docHeight;
104                    self.getPositions();
105                }
106            }, 250);
107        },
108
109        getHash: function ($link) {
110            return $link.attr('href').split('#')[1];
111        },
112
113        getPositions: function () {
114            var self = this;
115            var linkHref;
116            var topPos;
117            var $target;
118
119            self.$nav.each(function () {
120                linkHref = self.getHash($(this));
121                $target = $('#' + linkHref);
122
123                if ($target.length) {
124                    topPos = $target.offset().top;
125                    self.sections[linkHref] = Math.round(topPos) - self.config.scrollOffset;
126                }
127            });
128        },
129
130        getSection: function (windowPos) {
131            var returnValue = null;
132            var windowHeight = Math.round(this.$win.height() * this.config.scrollThreshold);
133
134            for (var section in this.sections) {
135                if ((this.sections[section] - windowHeight) < windowPos) {
136                    returnValue = section;
137                }
138            }
139
140            return returnValue;
141        },
142
143        handleClick: function (e) {
144            var self = this;
145            var $link = $(e.currentTarget);
146            var $parent = $link.parent();
147            var newLoc = '#' + self.getHash($link);
148
149            //if(!$parent.hasClass(self.config.currentClass)) {
150            if ($(newLoc).length > 0) {
151                //Start callback
152                if (self.config.begin) {
153                    self.config.begin();
154                }
155
156                //Change the highlighted nav item
157                self.adjustNav(self, $parent);
158
159                //Removing the auto-adjust on scroll
160                self.unbindInterval();
161
162                //Scroll to the correct position
163                self.scrollTo(newLoc, function () {
164                    //Do we need to change the hash?
165                    if (self.config.changeHash) {
166                        window.location.hash = newLoc;
167                    }
168
169                    //Add the auto-adjust on scroll back in
170                    self.bindInterval();
171
172                    //End callback
173                    if (self.config.end) {
174                        self.config.end();
175                    }
176                });
177                e.preventDefault();
178            }
179            //}
180
181
182        },
183
184        scrollChange: function () {
185            var windowTop = this.$win.scrollTop();

186            var position = this.getSection(windowTop);
187            var $parent;
188
189            //If the position is set
190            if (position !== null) {
191                $parent = this.$elem.find('a[href$="#' + position + '"]').parent();
192
193                //If it's not already the current section
194                if (!$parent.hasClass(this.config.currentClass)) {
195                    //Change the highlighted nav item
196                    this.adjustNav(this, $parent);
197
198                    //If there is a scrollChange callback
199                    if (this.config.scrollChange) {
200                        this.config.scrollChange($parent);
201                    }
202                }
203            }
204        },
205
206        scrollTo: function (target, callback) {
207            if ($(target).length > 0) {
208                var offset = $(target).offset().top;
209
210                $('html, body').animate({
211                    scrollTop: offset - this.config.scrollOffset
212                }, this.config.scrollSpeed, this.config.easing, callback);
213            }
214        },
215
216        unbindInterval: function () {
217            clearInterval(this.t);
218            this.$win.unbind('scroll.onePageNav');
219        }
220    };
221
222    OnePageNav.defaults = OnePageNav.prototype.defaults;
223
224    $.fn.onePageNav = function (options) {
225        return this.each(function () {
226            new OnePageNav(this, options).init();
227        });
228    };
229
230})(jQuery, window, document);