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/*

* 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 2.2.0

*

* 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.$nav = this.$elem.find('a');

this.$win = $(window);

this.sections = {};

this.didScroll = false;

this.$doc = $(document);

this.docHeight = this.$doc.height();

};

// the plugin prototype

OnePageNav.prototype = {

defaults: {

currentClass: 'current',

changeHash: false,

easing: 'swing',

filter: '',

scrollSpeed: 750,

scrollOffset: 66,

scrollThreshold: 0.01,

begin: false,

end: false,

scrollChange: false

},

init: function() {

var self = this;

// Introduce defaults that can be extended either

// globally or using an object literal.

self.config = $.extend({}, self.defaults, self.options, self.metadata);

//Filter any links out of the nav

if(self.config.filter !== '') {

self.$nav = self.$nav.filter(self.config.filter);

}

//Handle clicks on the nav

self.$nav.on('click.onePageNav', $.proxy(self.handleClick, self));

//Get the section positions

self.getPositions();

//Handle scroll changes

self.bindInterval();

//Update the positions on resize too

self.$win.on('resize.onePageNav', $.proxy(self.getPositions, self));

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) - self.config.scrollOffset;

}

});

},

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

$.scrollTo(newLoc, self.config.scrollSpeed, {

axis: 'y',

easing: self.config.easing,

offset: {

top: -self.config.scrollOffset

},

onAfter: 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);

}

}

}

},

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 );