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- /**
- * smooth-scroll v5.3.3
- * Animate scrolling to anchor links, by Chris Ferdinandi.
- * http://github.com/cferdinandi/smooth-scroll
- *
- * Free to use under the MIT License.
- * http://gomakethings.com/mit/
- */
- (function (root, factory) {
- if ( typeof define === 'function' && define.amd ) {
- define('smoothScroll', factory(root));
- } else if ( typeof exports === 'object' ) {
- module.exports = factory(root);
- } else {
- root.smoothScroll = factory(root);
- }
- })(window || this, function (root) {
- 'use strict';
- //
- // Variables
- //
- var smoothScroll = {}; // Object for public APIs
- var supports = !!document.querySelector && !!root.addEventListener; // Feature test
- var settings, eventTimeout, fixedHeader;
- // Default settings
- var defaults = {
- speed: 500,
- easing: 'easeInOutCubic',
- offset: 0,
- updateURL: true,
- callbackBefore: function () {},
- callbackAfter: function () {}
- };
- //
- // Methods
- //
- /**
- * A simple forEach() implementation for Arrays, Objects and NodeLists
- * @private
- * @param {Array|Object|NodeList} collection Collection of items to iterate
- * @param {Function} callback Callback function for each iteration
- * @param {Array|Object|NodeList} scope Object/NodeList/Array that forEach is iterating over (aka `this`)
- */
- var forEach = function (collection, callback, scope) {
- if (Object.prototype.toString.call(collection) === '[object Object]') {
- for (var prop in collection) {
- if (Object.prototype.hasOwnProperty.call(collection, prop)) {
- callback.call(scope, collection[prop], prop, collection);
- }
- }
- } else {
- for (var i = 0, len = collection.length; i < len; i++) {
- callback.call(scope, collection[i], i, collection);
- }
- }
- };
- /**
- * Merge defaults with user options
- * @private
- * @param {Object} defaults Default settings
- * @param {Object} options User options
- * @returns {Object} Merged values of defaults and options
- */
- var extend = function ( defaults, options ) {
- var extended = {};
- forEach(defaults, function (value, prop) {
- extended[prop] = defaults[prop];
- });
- forEach(options, function (value, prop) {
- extended[prop] = options[prop];
- });
- return extended;
- };
- /**
- * Get the closest matching element up the DOM tree
- * @param {Element} elem Starting element
- * @param {String} selector Selector to match against (class, ID, or data attribute)
- * @return {Boolean|Element} Returns false if not match found
- */
- var getClosest = function (elem, selector) {
- var firstChar = selector.charAt(0);
- for ( ; elem && elem !== document; elem = elem.parentNode ) {
- if ( firstChar === '.' ) {
- if ( elem.classList.contains( selector.substr(1) ) ) {
- return elem;
- }
- } else if ( firstChar === '#' ) {
- if ( elem.id === selector.substr(1) ) {
- return elem;
- }
- } else if ( firstChar === '[' ) {
- if ( elem.hasAttribute( selector.substr(1, selector.length - 2) ) ) {
- return elem;
- }
- }
- }
- return false;
- };
- /**
- * Get the height of an element
- * @private
- * @param {Node]} elem The element
- * @return {Number} The element's height
- */
- var getHeight = function (elem) {
- return Math.max( elem.scrollHeight, elem.offsetHeight, elem.clientHeight );
- };
- /**
- * Escape special characters for use with querySelector
- * @private
- * @param {String} id The anchor ID to escape
- * @author Mathias Bynens
- * @link https://github.com/mathiasbynens/CSS.escape
- */
- var escapeCharacters = function ( id ) {
- var string = String(id);
- var length = string.length;
- var index = -1;
- var codeUnit;
- var result = '';
- var firstCodeUnit = string.charCodeAt(0);
- while (++index < length) {
- codeUnit = string.charCodeAt(index);
- // Note: there’s no need to special-case astral symbols, surrogate
- // pairs, or lone surrogates.
- // If the character is NULL (U+0000), then throw an
- // `InvalidCharacterError` exception and terminate these steps.
- if (codeUnit === 0x0000) {
- throw new InvalidCharacterError(
- 'Invalid character: the input contains U+0000.'
- );
- }
- // If the character is not handled by one of the above rules and is
- // greater than or equal to U+0080, is `-` (U+002D) or `_` (U+005F), or
- // is in one of the ranges [0-9] (U+0030 to U+0039), [A-Z] (U+0041 to
- // U+005A), or [a-z] (U+0061 to U+007A), […]
- if (
- codeUnit >= 0x0080 ||
- codeUnit === 0x002D ||
- codeUnit === 0x005F ||
- codeUnit >= 0x0030 && codeUnit <= 0x0039 ||
- codeUnit >= 0x0041 && codeUnit <= 0x005A ||
- codeUnit >= 0x0061 && codeUnit <= 0x007A
- ) {
- // the character itself
- result += string.charAt(index);
- continue;
- }
- // Otherwise, the escaped character.
- // http://dev.w3.org/csswg/cssom/#escape-a-character
- result += '' + string.charAt(index);
- }
- return result;
- };
- /**
- * Calculate the easing pattern
- * @private
- * @link https://gist.github.com/gre/1650294
- * @param {String} type Easing pattern
- * @param {Number} time Time animation should take to complete
- * @returns {Number}
- */
- var easingPattern = function ( type, time ) {
- var pattern;
- if ( type === 'easeInQuad' ) pattern = time * time; // accelerating from zero velocity
- if ( type === 'easeOutQuad' ) pattern = time * (2 - time); // decelerating to zero velocity
- if ( type === 'easeInOutQuad' ) pattern = time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time; // acceleration until halfway, then deceleration
- if ( type === 'easeInCubic' ) pattern = time * time * time; // accelerating from zero velocity
- if ( type === 'easeOutCubic' ) pattern = (--time) * time * time + 1; // decelerating to zero velocity
- if ( type === 'easeInOutCubic' ) pattern = time < 0.5 ? 4 * time * time * time : (time - 1) * (2 * time - 2) * (2 * time - 2) + 1; // acceleration until halfway, then deceleration
- if ( type === 'easeInQuart' ) pattern = time * time * time * time; // accelerating from zero velocity
- if ( type === 'easeOutQuart' ) pattern = 1 - (--time) * time * time * time; // decelerating to zero velocity
- if ( type === 'easeInOutQuart' ) pattern = time < 0.5 ? 8 * time * time * time * time : 1 - 8 * (--time) * time * time * time; // acceleration until halfway, then deceleration
- if ( type === 'easeInQuint' ) pattern = time * time * time * time * time; // accelerating from zero velocity
- if ( type === 'easeOutQuint' ) pattern = 1 + (--time) * time * time * time * time; // decelerating to zero velocity
- if ( type === 'easeInOutQuint' ) pattern = time < 0.5 ? 16 * time * time * time * time * time : 1 + 16 * (--time) * time * time * time * time; // acceleration until halfway, then deceleration
- return pattern || time; // no easing, no acceleration
- };
- /**
- * Calculate how far to scroll
- * @private
- * @param {Element} anchor The anchor element to scroll to
- * @param {Number} headerHeight Height of a fixed header, if any
- * @param {Number} offset Number of pixels by which to offset scroll
- * @returns {Number}
- */
- var getEndLocation = function ( anchor, headerHeight, offset ) {
- var location = 0;
- if (anchor.offsetParent) {
- do {
- location += anchor.offsetTop;
- anchor = anchor.offsetParent;
- } while (anchor);
- }
- location = location - headerHeight - offset;
- return location >= 0 ? location : 0;
- };
- /**
- * Determine the document's height
- * @private
- * @returns {Number}
- */
- var getDocumentHeight = function () {
- return Math.max(
- document.body.scrollHeight, document.documentElement.scrollHeight,
- document.body.offsetHeight, document.documentElement.offsetHeight,
- document.body.clientHeight, document.documentElement.clientHeight
- );
- };
- /**
- * Convert data-options attribute into an object of key/value pairs
- * @private
- * @param {String} options Link-specific options as a data attribute string
- * @returns {Object}
- */
- var getDataOptions = function ( options ) {
- return !options || !(typeof JSON === 'object' && typeof JSON.parse === 'function') ? {} : JSON.parse( options );
- };
- /**
- * Update the URL
- * @private
- * @param {Element} anchor The element to scroll to
- * @param {Boolean} url Whether or not to update the URL history
- */
- var updateUrl = function ( anchor, url ) {
- if ( history.pushState && (url || url === 'true') ) {
- history.pushState( null, null, [root.location.protocol, '//', root.location.host, root.location.pathname, root.location.search, anchor].join('') );
- }
- };
- /**
- * Start/stop the scrolling animation
- * @public
- * @param {Element} toggle The element that toggled the scroll event
- * @param {Element} anchor The element to scroll to
- * @param {Object} options
- */
- smoothScroll.animateScroll = function ( toggle, anchor, options ) {
- // Options and overrides
- var settings = extend( settings || defaults, options || {} ); // Merge user options with defaults
- var overrides = getDataOptions( toggle ? toggle.getAttribute('data-options') : null );
- settings = extend( settings, overrides );
- anchor = '#' + escapeCharacters(anchor.substr(1)); // Escape special characters and leading numbers
- // Selectors and variables
- var anchorElem = anchor === '#' ? document.documentElement : document.querySelector(anchor);
- var startLocation = root.pageYOffset; // Current location on the page
- if ( !fixedHeader ) { fixedHeader = document.querySelector('[data-scroll-header]'); } // Get the fixed header if not already set
- var headerHeight = fixedHeader === null ? 0 : ( getHeight( fixedHeader ) + fixedHeader.offsetTop ); // Get the height of a fixed header if one exists
- var endLocation = getEndLocation( anchorElem, headerHeight, parseInt(settings.offset, 10) ); // Scroll to location
- var animationInterval; // interval timer
- var distance = endLocation - startLocation; // distance to travel
- var documentHeight = getDocumentHeight();
- var timeLapsed = 0;
- var percentage, position;
- // Update URL
- updateUrl(anchor, settings.updateURL);
- /**
- * Stop the scroll animation when it reaches its target (or the bottom/top of page)
- * @private
- * @param {Number} position Current position on the page
- * @param {Number} endLocation Scroll to location
- * @param {Number} animationInterval How much to scroll on this loop
- */
- var stopAnimateScroll = function (position, endLocation, animationInterval) {
- var currentLocation = root.pageYOffset;
- if ( position == endLocation || currentLocation == endLocation || ( (root.innerHeight + currentLocation) >= documentHeight ) ) {
- clearInterval(animationInterval);
- anchorElem.focus();
- settings.callbackAfter( toggle, anchor ); // Run callbacks after animation complete
- }
- };
- /**
- * Loop scrolling animation
- * @private
- */
- var loopAnimateScroll = function () {
- timeLapsed += 16;
- percentage = ( timeLapsed / parseInt(settings.speed, 10) );
- percentage = ( percentage > 1 ) ? 1 : percentage;
- position = startLocation + ( distance * easingPattern(settings.easing, percentage) );
- root.scrollTo( 0, Math.floor(position) );
- stopAnimateScroll(position, endLocation, animationInterval);
- };
- /**
- * Set interval timer
- * @private
- */
- var startAnimateScroll = function () {
- settings.callbackBefore( toggle, anchor ); // Run callbacks before animating scroll
- animationInterval = setInterval(loopAnimateScroll, 16);
- };
- /**
- * Reset position to fix weird iOS bug
- * @link https://github.com/cferdinandi/smooth-scroll/issues/45
- */
- if ( root.pageYOffset === 0 ) {
- root.scrollTo( 0, 0 );
- }
- // Start scrolling animation
- startAnimateScroll();
- };
- /**
- * If smooth scroll element clicked, animate scroll
- * @private
- */
- var eventHandler = function (event) {
- var toggle = getClosest(event.target, '[data-scroll]');
- if ( toggle && toggle.tagName.toLowerCase() === 'a' ) {
- event.preventDefault(); // Prevent default click event
- smoothScroll.animateScroll( toggle, toggle.hash, settings); // Animate scroll
- }
- };
- /**
- * On window scroll and resize, only run events at a rate of 15fps for better performance
- * @private
- * @param {Function} eventTimeout Timeout function
- * @param {Object} settings
- */
- var eventThrottler = function (event) {
- if ( !eventTimeout ) {
- eventTimeout = setTimeout(function() {
- eventTimeout = null; // Reset timeout
- headerHeight = fixedHeader === null ? 0 : ( getHeight( fixedHeader ) + fixedHeader.offsetTop ); // Get the height of a fixed header if one exists
- }, 66);
- }
- };
- /**
- * Destroy the current initialization.
- * @public
- */
- smoothScroll.destroy = function () {
- // If plugin isn't already initialized, stop
- if ( !settings ) return;
- // Remove event listeners
- document.removeEventListener( 'click', eventHandler, false );
- root.removeEventListener( 'resize', eventThrottler, false );
- // Reset varaibles
- settings = null;
- eventTimeout = null;
- fixedHeader = null;
- };
- /**
- * Initialize Smooth Scroll
- * @public
- * @param {Object} options User settings
- */
- smoothScroll.init = function ( options ) {
- // feature test
- if ( !supports ) return;
- // Destroy any existing initializations
- smoothScroll.destroy();
- // Selectors and variables
- settings = extend( defaults, options || {} ); // Merge user options with defaults
- fixedHeader = document.querySelector('[data-scroll-header]'); // Get the fixed header
- // When a toggle is clicked, run the click handler
- document.addEventListener('click', eventHandler, false );
- if ( fixedHeader ) { root.addEventListener( 'resize', eventThrottler, false ); }
- };
- //
- // Public APIs
- //
- return smoothScroll;
- });
- smoothScroll.init({
- speed: 1000,
- easing: 'easeInOutCubic',
- offset: 0,
- updateURL: false,
- callbackBefore: function ( toggle, anchor ) {},
- callbackAfter: function ( toggle, anchor ) {}
- });
- jQuery('.section-navigation a[href*=#]').attr('data-scroll', 1)
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