https://www.drugrehab.com/wp-content/themes/dr/js/plugins_ext/jquery.nav.js

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

182			var position = this.getSection(windowTop);
183			var $parent;
184
185			//If the position is set
186			if(position !== null) {
187				$parent = this.$elem.find('a[href$="#' + position + '"]').parent();
188
189				//If it's not already the current section
190				if(!$parent.hasClass(this.config.currentClass)) {
191					//Change the highlighted nav item
192					this.adjustNav(this, $parent);
193
194					//If there is a scrollChange callback
195					if(this.config.scrollChange) {
196						this.config.scrollChange($parent);
197					}
198				}
199			}
200		},
201
202		scrollTo: function(target, callback) {
203			var offset = $(target).offset().top;
204
205			$('html, body').animate({
206				scrollTop: offset - this.config.userOffset
207			}, this.config.scrollSpeed, this.config.easing, callback);
208		},
209
210		unbindInterval: function() {
211			clearInterval(this.t);
212			this.$win.unbind('scroll.onePageNav');
213		}
214	};
215
216	OnePageNav.defaults = OnePageNav.prototype.defaults;
217
218	$.fn.onePageNav = function(options) {
219		return this.each(function() {
220			new OnePageNav(this, options).init();
221		});
222	};
223
224})( jQuery, window , document );