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(function ($, window, document, undefined) {
var OnePageNav = function (elem, options) { this.elem = elem; this.$elem = $(elem); this.options = options; this.metadata = this.$elem.data('plugin-options'); this.$win = $(window); this.sections = {}; this.didScroll = !1; this.$doc = $(document); this.docHeight = this.$doc.height() }; OnePageNav.prototype = {
defaults: { navItems: 'a', currentClass: 'current', changeHash: !1, easing: 'swing', filter: '', scrollSpeed: 750, scrollThreshold: 0.5, begin: !1, end: !1, scrollChange: !1 }, init: function () {
this.config = $.extend({}, this.defaults, this.options, this.metadata); this.$nav = this.$elem.find(this.config.navItems); if (this.config.filter !== '') { this.$nav = this.$nav.filter(this.config.filter) }
this.$nav.on('click.onePageNav', $.proxy(this.handleClick, this)); this.getPositions(); this.bindInterval(); this.$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 = !0 }); self.t = setInterval(function () {
docHeight = self.$doc.height(); if (self.didScroll) { self.didScroll = !1; self.scrollChange() }
if (docHeight !== self.docHeight) { self.docHeight = docHeight; self.getPositions() }
}, 250)
}, getHash: function ($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)) {
if (self.config.begin) { self.config.begin() }
self.adjustNav(self, $parent); self.unbindInterval(); self.scrollTo(newLoc, function () {
if (self.config.changeHash) { window.location.hash = newLoc }
self.bindInterval(); if (self.config.end) { self.config.end() }
})
}
e.preventDefault()
}, scrollChange: function () { var windowTop = this.$win.scrollTop(); var position = this.getSection(windowTop); var $parent; if (position !== null) { $parent = this.$elem.find('a[href$="#' + position + '"]').parent(); if (!$parent.hasClass(this.config.currentClass)) { this.adjustNav(this, $parent); if (this.config.scrollChange) { this.config.scrollChange($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)