http://www.beogradski-taxi.com/app/resources/jquery_004.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 2.2
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.$nav = this.$elem.find('a');
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			currentClass: 'current',
40			changeHash: false,
41			easing: 'swing',
42			filter: '',
43			scrollSpeed: 750,
44			scrollOffset: 0,
45			scrollThreshold: 0.5,
46			begin: false,
47			end: false,
48			scrollChange: false
49		},
50
51		init: function() {
52			var self = this;
53			
54			// Introduce defaults that can be extended either
55			// globally or using an object literal.
56			self.config = $.extend({}, self.defaults, self.options, self.metadata);
57			
58			//Filter any links out of the nav
59			if(self.config.filter !== '') {
60				self.$nav = self.$nav.filter(self.config.filter);
61			}
62			
63			//Handle clicks on the nav
64			self.$nav.on('click.onePageNav', $.proxy(self.handleClick, self));
65
66			//Get the section positions
67			self.getPositions();
68			
69			//Handle scroll changes
70			self.bindInterval();
71			
72			//Update the positions on resize too
73			self.$win.on('resize.onePageNav', $.proxy(self.getPositions, self));
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 = $target.offset().top;
124					self.sections[linkHref] = Math.round(topPos) - self.config.scrollOffset;
125				}
126			});
127		},
128		
129		getSection: function(windowPos) {
130			var returnValue = null;
131			var windowHeight = Math.round(this.$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				$.scrollTo(newLoc, self.config.scrollSpeed, {
162					axis: 'y',
163					easing: self.config.easing,
164					offset: {
165						top: -self.config.scrollOffset
166					},
167					onAfter: function() {
168						//Do we need to change the hash?
169						if(self.config.changeHash) {
170							window.location.hash = newLoc;
171						}
172						
173						//Add the auto-adjust on scroll back in
174						self.bindInterval();
175						
176						//End callback
177						if(self.config.end) {
178							self.config.end();
179						}
180					}
181				});
182			}
183
184			e.preventDefault();
185		},
186		
187		scrollChange: function() {
188			var windowTop = this.$win.scrollTop();

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