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184 行
5.8 KiB
184 行
5.8 KiB
/**
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* Single Page Nav Plugin
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* Copyright (c) 2014 Chris Wojcik <hello@chriswojcik.net>
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* Dual licensed under MIT and GPL.
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* @author Chris Wojcik
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* @version 1.2.0
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*/
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// Utility
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if (typeof Object.create !== 'function') {
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Object.create = function(obj) {
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function F() {}
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F.prototype = obj;
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return new F();
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};
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}
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(function($, window, document, undefined) {
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"use strict";
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var SinglePageNav = {
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init: function(options, container) {
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this.options = $.extend({}, $.fn.singlePageNav.defaults, options);
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this.container = container;
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this.$container = $(container);
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this.$links = this.$container.find('a');
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if (this.options.filter !== '') {
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this.$links = this.$links.filter(this.options.filter);
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}
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this.$window = $(window);
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this.$htmlbody = $('html, body');
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this.$links.on('click.singlePageNav', $.proxy(this.handleClick, this));
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this.didScroll = false;
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this.checkPosition();
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this.setTimer();
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},
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handleClick: function(e) {
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var self = this,
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link = e.currentTarget,
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$elem = $(link.hash);
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e.preventDefault();
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if ($elem.length) { // Make sure the target elem exists
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// Prevent active link from cycling during the scroll
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self.clearTimer();
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// Before scrolling starts
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if (typeof self.options.beforeStart === 'function') {
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self.options.beforeStart();
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}
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self.setActiveLink(link.hash);
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self.scrollTo($elem, function() {
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if (self.options.updateHash && history.pushState) {
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history.pushState(null,null, link.hash);
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}
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self.setTimer();
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// After scrolling ends
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if (typeof self.options.onComplete === 'function') {
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self.options.onComplete();
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}
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});
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}
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},
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scrollTo: function($elem, callback) {
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var self = this;
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var target = self.getCoords($elem).top;
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var called = false;
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self.$htmlbody.stop().animate(
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{scrollTop: target},
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{
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duration: self.options.speed,
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easing: self.options.easing,
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complete: function() {
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if (typeof callback === 'function' && !called) {
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callback();
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}
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called = true;
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}
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}
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);
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},
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setTimer: function() {
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var self = this;
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self.$window.on('scroll.singlePageNav', function() {
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self.didScroll = true;
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});
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self.timer = setInterval(function() {
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if (self.didScroll) {
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self.didScroll = false;
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self.checkPosition();
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}
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}, 250);
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},
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clearTimer: function() {
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clearInterval(this.timer);
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this.$window.off('scroll.singlePageNav');
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this.didScroll = false;
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},
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// Check the scroll position and set the active section
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checkPosition: function() {
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var scrollPos = this.$window.scrollTop();
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var currentSection = this.getCurrentSection(scrollPos);
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if(currentSection!==null) {
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this.setActiveLink(currentSection);
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}
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},
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getCoords: function($elem) {
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return {
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top: Math.round($elem.offset().top) - this.options.offset
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};
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},
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setActiveLink: function(href) {
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var $activeLink = this.$container.find("a[href$='" + href + "']");
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if (!$activeLink.hasClass(this.options.currentClass)) {
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this.$links.removeClass(this.options.currentClass);
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$activeLink.addClass(this.options.currentClass);
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}
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},
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getCurrentSection: function(scrollPos) {
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var i, hash, coords, section;
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for (i = 0; i < this.$links.length; i++) {
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hash = this.$links[i].hash;
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if ($(hash).length) {
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coords = this.getCoords($(hash));
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if (scrollPos >= coords.top - this.options.threshold) {
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section = hash;
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}
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}
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}
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// The current section or the first link if it is found
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return section || ((this.$links.length===0) ? (null) : (this.$links[0].hash));
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}
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};
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$.fn.singlePageNav = function(options) {
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return this.each(function() {
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var singlePageNav = Object.create(SinglePageNav);
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singlePageNav.init(options, this);
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});
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};
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$.fn.singlePageNav.defaults = {
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offset: 0,
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threshold: 120,
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speed: 400,
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currentClass: 'current',
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easing: 'swing',
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updateHash: false,
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filter: '',
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onComplete: false,
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beforeStart: false
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};
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})(jQuery, window, document);
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