| /* |
| * jQuery One Page Nav Plugin |
| * http://github.com/davist11/jQuery-One-Page-Nav |
| * |
| * Copyright (c) 2010 Trevor Davis (http://trevordavis.net) |
| * Dual licensed under the MIT and GPL licenses. |
| * Uses the same license as jQuery, see: |
| * http://jquery.org/license |
| * |
| * @version 3.0.0 |
| * |
| * Example usage: |
| * $('#nav').onePageNav({ |
| * currentClass: 'current', |
| * changeHash: false, |
| * scrollSpeed: 750 |
| * }); |
| */ |
| |
| ;(function($, window, document, undefined){ |
| |
| // our plugin constructor |
| var OnePageNav = function(elem, options){ |
| this.elem = elem; |
| this.$elem = $(elem); |
| this.options = options; |
| this.metadata = this.$elem.data('plugin-options'); |
| this.$win = $(window); |
| this.sections = {}; |
| this.didScroll = false; |
| this.$doc = $(document); |
| this.docHeight = this.$doc.height(); |
| }; |
| |
| // the plugin prototype |
| OnePageNav.prototype = { |
| defaults: { |
| navItems: 'a', |
| currentClass: 'current', |
| changeHash: false, |
| easing: 'swing', |
| filter: '', |
| scrollSpeed: 750, |
| scrollThreshold: 0.5, |
| begin: false, |
| end: false, |
| scrollChange: false |
| }, |
| |
| init: function() { |
| // Introduce defaults that can be extended either |
| // globally or using an object literal. |
| this.config = $.extend({}, this.defaults, this.options, this.metadata); |
| |
| this.$nav = this.$elem.find(this.config.navItems); |
| |
| //Filter any links out of the nav |
| if(this.config.filter !== '') { |
| this.$nav = this.$nav.filter(this.config.filter); |
| } |
| |
| //Handle clicks on the nav |
| this.$nav.on('click.onePageNav', $.proxy(this.handleClick, this)); |
| |
| //Get the section positions |
| this.getPositions(); |
| |
| //Handle scroll changes |
| this.bindInterval(); |
| |
| //Update the positions on resize too |
| this.$win.on('resize.onePageNav', $.proxy(this.getPositions, this)); |
| |
| return this; |
| }, |
| |
| adjustNav: function(self, $parent) { |
| self.$elem.find('.' + self.config.currentClass).removeClass(self.config.currentClass); |
| $parent.addClass(self.config.currentClass); |
| }, |
| |
| bindInterval: function() { |
| var self = this; |
| var docHeight; |
| |
| self.$win.on('scroll.onePageNav', function() { |
| self.didScroll = true; |
| }); |
| |
| self.t = setInterval(function() { |
| docHeight = self.$doc.height(); |
| |
| //If it was scrolled |
| if(self.didScroll) { |
| self.didScroll = false; |
| self.scrollChange(); |
| } |
| |
| //If the document height changes |
| if(docHeight !== self.docHeight) { |
| self.docHeight = docHeight; |
| self.getPositions(); |
| } |
| }, 250); |
| }, |
| |
| getHash: function($link) { |
| return $link.attr('href').split('#')[1]; |
| }, |
| |
| getPositions: function() { |
| var self = this; |
| var linkHref; |
| var topPos; |
| var $target; |
| |
| self.$nav.each(function() { |
| linkHref = self.getHash($(this)); |
| $target = $('#' + linkHref); |
| |
| if($target.length) { |
| topPos = $target.offset().top; |
| self.sections[linkHref] = Math.round(topPos); |
| } |
| }); |
| }, |
| |
| getSection: function(windowPos) { |
| var returnValue = null; |
| var windowHeight = Math.round(this.$win.height() * this.config.scrollThreshold); |
| |
| for(var section in this.sections) { |
| if((this.sections[section] - windowHeight) < windowPos) { |
| returnValue = section; |
| } |
| } |
| |
| return returnValue; |
| }, |
| |
| handleClick: function(e) { |
| var self = this; |
| var $link = $(e.currentTarget); |
| var $parent = $link.parent(); |
| var newLoc = '#' + self.getHash($link); |
| |
| if(!$parent.hasClass(self.config.currentClass)) { |
| //Start callback |
| if(self.config.begin) { |
| self.config.begin(); |
| } |
| |
| //Change the highlighted nav item |
| self.adjustNav(self, $parent); |
| |
| //Removing the auto-adjust on scroll |
| self.unbindInterval(); |
| |
| //Scroll to the correct position |
| self.scrollTo(newLoc, function() { |
| //Do we need to change the hash? |
| if(self.config.changeHash) { |
| window.location.hash = newLoc; |
| } |
| |
| //Add the auto-adjust on scroll back in |
| self.bindInterval(); |
| |
| //End callback |
| if(self.config.end) { |
| self.config.end(); |
| } |
| }); |
| } |
| |
| e.preventDefault(); |
| }, |
| |
| scrollChange: function() { |
| var windowTop = this.$win.scrollTop(); |
| var position = this.getSection(windowTop); |
| var $parent; |
| |
| //If the position is set |
| if(position !== null) { |
| $parent = this.$elem.find('a[href$="#' + position + '"]').parent(); |
| |
| //If it's not already the current section |
| if(!$parent.hasClass(this.config.currentClass)) { |
| //Change the highlighted nav item |
| this.adjustNav(this, $parent); |
| |
| //If there is a scrollChange callback |
| if(this.config.scrollChange) { |
| this.config.scrollChange($parent); |
| } |
| } |
| } |
| }, |
| |
| scrollTo: function(target, callback) { |
| var offset = $(target).offset().top; |
| |
| $('html, body').animate({ |
| scrollTop: offset |
| }, this.config.scrollSpeed, this.config.easing, callback); |
| }, |
| |
| unbindInterval: function() { |
| clearInterval(this.t); |
| this.$win.unbind('scroll.onePageNav'); |
| } |
| }; |
| |
| OnePageNav.defaults = OnePageNav.prototype.defaults; |
| |
| $.fn.onePageNav = function(options) { |
| return this.each(function() { |
| new OnePageNav(this, options).init(); |
| }); |
| }; |
| |
| })( jQuery, window , document ); |