640 lines
18 KiB
JavaScript
640 lines
18 KiB
JavaScript
|
/*!
|
|||
|
* smooth-scroll v12.1.3: Animate scrolling to anchor links
|
|||
|
* (c) 2017 Chris Ferdinandi
|
|||
|
* MIT License
|
|||
|
* http://github.com/cferdinandi/smooth-scroll
|
|||
|
*/
|
|||
|
|
|||
|
/**
|
|||
|
* closest() polyfill
|
|||
|
* @link https://developer.mozilla.org/en-US/docs/Web/API/Element/closest#Polyfill
|
|||
|
*/
|
|||
|
if (window.Element && !Element.prototype.closest) {
|
|||
|
Element.prototype.closest = function(s) {
|
|||
|
var matches = (this.document || this.ownerDocument).querySelectorAll(s),
|
|||
|
i,
|
|||
|
el = this;
|
|||
|
do {
|
|||
|
i = matches.length;
|
|||
|
while (--i >= 0 && matches.item(i) !== el) {}
|
|||
|
} while ((i < 0) && (el = el.parentElement));
|
|||
|
return el;
|
|||
|
};
|
|||
|
}
|
|||
|
|
|||
|
/**
|
|||
|
* requestAnimationFrame() polyfill
|
|||
|
* By Erik Möller. Fixes from Paul Irish and Tino Zijdel.
|
|||
|
* @link http://paulirish.com/2011/requestanimationframe-for-smart-animating/
|
|||
|
* @link http://my.opera.com/emoller/blog/2011/12/20/requestanimationframe-for-smart-er-animating
|
|||
|
* @license MIT
|
|||
|
*/
|
|||
|
(function() {
|
|||
|
var lastTime = 0;
|
|||
|
var vendors = ['ms', 'moz', 'webkit', 'o'];
|
|||
|
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
|
|||
|
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
|
|||
|
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] ||
|
|||
|
window[vendors[x]+'CancelRequestAnimationFrame'];
|
|||
|
}
|
|||
|
|
|||
|
if (!window.requestAnimationFrame) {
|
|||
|
window.requestAnimationFrame = function(callback, element) {
|
|||
|
var currTime = new Date().getTime();
|
|||
|
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
|
|||
|
var id = window.setTimeout((function() { callback(currTime + timeToCall); }),
|
|||
|
timeToCall);
|
|||
|
lastTime = currTime + timeToCall;
|
|||
|
return id;
|
|||
|
};
|
|||
|
}
|
|||
|
|
|||
|
if (!window.cancelAnimationFrame) {
|
|||
|
window.cancelAnimationFrame = function(id) {
|
|||
|
clearTimeout(id);
|
|||
|
};
|
|||
|
}
|
|||
|
}());
|
|||
|
|
|||
|
(function (root, factory) {
|
|||
|
if ( typeof define === 'function' && define.amd ) {
|
|||
|
define([], (function () {
|
|||
|
return factory(root);
|
|||
|
}));
|
|||
|
} else if ( typeof exports === 'object' ) {
|
|||
|
module.exports = factory(root);
|
|||
|
} else {
|
|||
|
root.SmoothScroll = factory(root);
|
|||
|
}
|
|||
|
})(typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : this, (function (window) {
|
|||
|
|
|||
|
'use strict';
|
|||
|
|
|||
|
//
|
|||
|
// Feature Test
|
|||
|
//
|
|||
|
|
|||
|
var supports =
|
|||
|
'querySelector' in document &&
|
|||
|
'addEventListener' in window &&
|
|||
|
'requestAnimationFrame' in window &&
|
|||
|
'closest' in window.Element.prototype;
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Default settings
|
|||
|
//
|
|||
|
|
|||
|
var defaults = {
|
|||
|
// Selectors
|
|||
|
ignore: '[data-scroll-ignore]',
|
|||
|
header: null,
|
|||
|
|
|||
|
// Speed & Easing
|
|||
|
speed: 500,
|
|||
|
offset: 0,
|
|||
|
easing: 'easeInOutCubic',
|
|||
|
customEasing: null,
|
|||
|
|
|||
|
// Callback API
|
|||
|
before: function () {},
|
|||
|
after: function () {}
|
|||
|
};
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Utility Methods
|
|||
|
//
|
|||
|
|
|||
|
/**
|
|||
|
* Merge two or more objects. Returns a new object.
|
|||
|
* @param {Object} objects The objects to merge together
|
|||
|
* @returns {Object} Merged values of defaults and options
|
|||
|
*/
|
|||
|
var extend = function () {
|
|||
|
|
|||
|
// Variables
|
|||
|
var extended = {};
|
|||
|
var deep = false;
|
|||
|
var i = 0;
|
|||
|
var length = arguments.length;
|
|||
|
|
|||
|
// Merge the object into the extended object
|
|||
|
var merge = function (obj) {
|
|||
|
for (var prop in obj) {
|
|||
|
if (obj.hasOwnProperty(prop)) {
|
|||
|
extended[prop] = obj[prop];
|
|||
|
}
|
|||
|
}
|
|||
|
};
|
|||
|
|
|||
|
// Loop through each object and conduct a merge
|
|||
|
for ( ; i < length; i++ ) {
|
|||
|
var obj = arguments[i];
|
|||
|
merge(obj);
|
|||
|
}
|
|||
|
|
|||
|
return extended;
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Get the height of an element.
|
|||
|
* @param {Node} elem The element to get the height of
|
|||
|
* @return {Number} The element's height in pixels
|
|||
|
*/
|
|||
|
var getHeight = function (elem) {
|
|||
|
return parseInt(window.getComputedStyle(elem).height, 10);
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Escape special characters for use with querySelector
|
|||
|
* @param {String} id The anchor ID to escape
|
|||
|
* @author Mathias Bynens
|
|||
|
* @link https://github.com/mathiasbynens/CSS.escape
|
|||
|
*/
|
|||
|
var escapeCharacters = function (id) {
|
|||
|
|
|||
|
// Remove leading hash
|
|||
|
if (id.charAt(0) === '#') {
|
|||
|
id = id.substr(1);
|
|||
|
}
|
|||
|
|
|||
|
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 (
|
|||
|
// If the character is in the range [\1-\1F] (U+0001 to U+001F) or is
|
|||
|
// U+007F, […]
|
|||
|
(codeUnit >= 0x0001 && codeUnit <= 0x001F) || codeUnit == 0x007F ||
|
|||
|
// If the character is the first character and is in the range [0-9]
|
|||
|
// (U+0030 to U+0039), […]
|
|||
|
(index === 0 && codeUnit >= 0x0030 && codeUnit <= 0x0039) ||
|
|||
|
// If the character is the second character and is in the range [0-9]
|
|||
|
// (U+0030 to U+0039) and the first character is a `-` (U+002D), […]
|
|||
|
(
|
|||
|
index === 1 &&
|
|||
|
codeUnit >= 0x0030 && codeUnit <= 0x0039 &&
|
|||
|
firstCodeUnit === 0x002D
|
|||
|
)
|
|||
|
) {
|
|||
|
// http://dev.w3.org/csswg/cssom/#escape-a-character-as-code-point
|
|||
|
result += '\\' + codeUnit.toString(16) + ' ';
|
|||
|
continue;
|
|||
|
}
|
|||
|
|
|||
|
// 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
|
|||
|
* @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 (settings, time) {
|
|||
|
var pattern;
|
|||
|
|
|||
|
// Default Easing Patterns
|
|||
|
if (settings.easing === 'easeInQuad') pattern = time * time; // accelerating from zero velocity
|
|||
|
if (settings.easing === 'easeOutQuad') pattern = time * (2 - time); // decelerating to zero velocity
|
|||
|
if (settings.easing === 'easeInOutQuad') pattern = time < 0.5 ? 2 * time * time : -1 + (4 - 2 * time) * time; // acceleration until halfway, then deceleration
|
|||
|
if (settings.easing === 'easeInCubic') pattern = time * time * time; // accelerating from zero velocity
|
|||
|
if (settings.easing === 'easeOutCubic') pattern = (--time) * time * time + 1; // decelerating to zero velocity
|
|||
|
if (settings.easing === 'easeInOutCubic') pattern = time < 0.5 ? 4 * time * time * time : (time - 1) * (2 * time - 2) * (2 * time - 2) + 1; // acceleration until halfway, then deceleration
|
|||
|
if (settings.easing === 'easeInQuart') pattern = time * time * time * time; // accelerating from zero velocity
|
|||
|
if (settings.easing === 'easeOutQuart') pattern = 1 - (--time) * time * time * time; // decelerating to zero velocity
|
|||
|
if (settings.easing === 'easeInOutQuart') pattern = time < 0.5 ? 8 * time * time * time * time : 1 - 8 * (--time) * time * time * time; // acceleration until halfway, then deceleration
|
|||
|
if (settings.easing === 'easeInQuint') pattern = time * time * time * time * time; // accelerating from zero velocity
|
|||
|
if (settings.easing === 'easeOutQuint') pattern = 1 + (--time) * time * time * time * time; // decelerating to zero velocity
|
|||
|
if (settings.easing === 'easeInOutQuint') pattern = time < 0.5 ? 16 * time * time * time * time * time : 1 + 16 * (--time) * time * time * time * time; // acceleration until halfway, then deceleration
|
|||
|
|
|||
|
// Custom Easing Patterns
|
|||
|
if (!!settings.customEasing) pattern = settings.customEasing(time);
|
|||
|
|
|||
|
return pattern || time; // no easing, no acceleration
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Determine the viewport's height
|
|||
|
* @returns {Number}
|
|||
|
*/
|
|||
|
var getViewportHeight = function() {
|
|||
|
return Math.max(document.documentElement.clientHeight, window.innerHeight || 0);
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Determine the document's height
|
|||
|
* @returns {Number}
|
|||
|
*/
|
|||
|
var getDocumentHeight = function () {
|
|||
|
return parseInt(window.getComputedStyle(document.documentElement).height, 10);
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Calculate how far to scroll
|
|||
|
* @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 = Math.max(location - headerHeight - offset, 0);
|
|||
|
return Math.min(location, getDocumentHeight() - getViewportHeight());
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Get the height of the fixed header
|
|||
|
* @param {Node} header The header
|
|||
|
* @return {Number} The height of the header
|
|||
|
*/
|
|||
|
var getHeaderHeight = function (header) {
|
|||
|
return !header ? 0 : (getHeight(header) + header.offsetTop);
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Bring the anchored element into focus
|
|||
|
* @param {Node} anchor The anchor element
|
|||
|
* @param {Number} endLocation The end location to scroll to
|
|||
|
* @param {Boolean} isNum If true, scroll is to a position rather than an element
|
|||
|
*/
|
|||
|
var adjustFocus = function (anchor, endLocation, isNum) {
|
|||
|
|
|||
|
// Don't run if scrolling to a number on the page
|
|||
|
if (isNum) return;
|
|||
|
|
|||
|
// Otherwise, bring anchor element into focus
|
|||
|
anchor.focus();
|
|||
|
if (document.activeElement.id !== anchor.id) {
|
|||
|
anchor.setAttribute('tabindex', '-1');
|
|||
|
anchor.focus();
|
|||
|
anchor.style.outline = 'none';
|
|||
|
}
|
|||
|
window.scrollTo(0 , endLocation);
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Check to see if user prefers reduced motion
|
|||
|
* @param {Object} settings Script settings
|
|||
|
*/
|
|||
|
var reduceMotion = function (settings) {
|
|||
|
if ('matchMedia' in window && window.matchMedia('(prefers-reduced-motion)').matches) {
|
|||
|
return true;
|
|||
|
}
|
|||
|
return false;
|
|||
|
};
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// SmoothScroll Constructor
|
|||
|
//
|
|||
|
|
|||
|
var SmoothScroll = function (selector, options) {
|
|||
|
|
|||
|
//
|
|||
|
// Variables
|
|||
|
//
|
|||
|
|
|||
|
var smoothScroll = {}; // Object for public APIs
|
|||
|
var settings, anchor, toggle, fixedHeader, headerHeight, eventTimeout, animationInterval;
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Methods
|
|||
|
//
|
|||
|
|
|||
|
/**
|
|||
|
* Cancel a scroll-in-progress
|
|||
|
*/
|
|||
|
smoothScroll.cancelScroll = function () {
|
|||
|
// clearInterval(animationInterval);
|
|||
|
cancelAnimationFrame(animationInterval);
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Start/stop the scrolling animation
|
|||
|
* @param {Node|Number} anchor The element or position to scroll to
|
|||
|
* @param {Element} toggle The element that toggled the scroll event
|
|||
|
* @param {Object} options
|
|||
|
*/
|
|||
|
smoothScroll.animateScroll = function (anchor, toggle, options) {
|
|||
|
|
|||
|
// Local settings
|
|||
|
var animateSettings = extend(settings || defaults, options || {}); // Merge user options with defaults
|
|||
|
|
|||
|
// Selectors and variables
|
|||
|
var isNum = Object.prototype.toString.call(anchor) === '[object Number]' ? true : false;
|
|||
|
var anchorElem = isNum || !anchor.tagName ? null : anchor;
|
|||
|
if (!isNum && !anchorElem) return;
|
|||
|
var startLocation = window.pageYOffset; // Current location on the page
|
|||
|
if (animateSettings.header && !fixedHeader) {
|
|||
|
// Get the fixed header if not already set
|
|||
|
fixedHeader = document.querySelector( animateSettings.header );
|
|||
|
}
|
|||
|
if (!headerHeight) {
|
|||
|
// Get the height of a fixed header if one exists and not already set
|
|||
|
headerHeight = getHeaderHeight(fixedHeader);
|
|||
|
}
|
|||
|
var endLocation = isNum ? anchor : getEndLocation(anchorElem, headerHeight, parseInt((typeof animateSettings.offset === 'function' ? animateSettings.offset() : animateSettings.offset), 10)); // Location to scroll to
|
|||
|
var distance = endLocation - startLocation; // distance to travel
|
|||
|
var documentHeight = getDocumentHeight();
|
|||
|
var timeLapsed = 0;
|
|||
|
var start, percentage, position;
|
|||
|
|
|||
|
/**
|
|||
|
* Stop the scroll animation when it reaches its target (or the bottom/top of page)
|
|||
|
* @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) {
|
|||
|
|
|||
|
// Get the current location
|
|||
|
var currentLocation = window.pageYOffset;
|
|||
|
|
|||
|
// Check if the end location has been reached yet (or we've hit the end of the document)
|
|||
|
if ( position == endLocation || currentLocation == endLocation || ((startLocation < endLocation && window.innerHeight + currentLocation) >= documentHeight )) {
|
|||
|
|
|||
|
// Clear the animation timer
|
|||
|
smoothScroll.cancelScroll();
|
|||
|
|
|||
|
// Bring the anchored element into focus
|
|||
|
adjustFocus(anchor, endLocation, isNum);
|
|||
|
|
|||
|
// Run callback after animation complete
|
|||
|
animateSettings.after(anchor, toggle);
|
|||
|
|
|||
|
// Reset start
|
|||
|
start = null;
|
|||
|
|
|||
|
return true;
|
|||
|
|
|||
|
}
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Loop scrolling animation
|
|||
|
*/
|
|||
|
var loopAnimateScroll = function (timestamp) {
|
|||
|
if (!start) { start = timestamp; }
|
|||
|
timeLapsed += timestamp - start;
|
|||
|
percentage = (timeLapsed / parseInt(animateSettings.speed, 10));
|
|||
|
percentage = (percentage > 1) ? 1 : percentage;
|
|||
|
position = startLocation + (distance * easingPattern(animateSettings, percentage));
|
|||
|
window.scrollTo(0, Math.floor(position));
|
|||
|
if (!stopAnimateScroll(position, endLocation)) {
|
|||
|
window.requestAnimationFrame(loopAnimateScroll);
|
|||
|
start = timestamp;
|
|||
|
}
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Reset position to fix weird iOS bug
|
|||
|
* @link https://github.com/cferdinandi/smooth-scroll/issues/45
|
|||
|
*/
|
|||
|
if (window.pageYOffset === 0) {
|
|||
|
window.scrollTo( 0, 0 );
|
|||
|
}
|
|||
|
|
|||
|
// Run callback before animation starts
|
|||
|
animateSettings.before(anchor, toggle);
|
|||
|
|
|||
|
// Start scrolling animation
|
|||
|
// startAnimateScroll();
|
|||
|
smoothScroll.cancelScroll();
|
|||
|
window.requestAnimationFrame(loopAnimateScroll);
|
|||
|
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Handle has change event
|
|||
|
*/
|
|||
|
var hashChangeHandler = function (event) {
|
|||
|
|
|||
|
// Get hash from URL
|
|||
|
var hash;
|
|||
|
try {
|
|||
|
hash = escapeCharacters(decodeURIComponent(window.location.hash));
|
|||
|
} catch(e) {
|
|||
|
hash = escapeCharacters(window.location.hash);
|
|||
|
}
|
|||
|
|
|||
|
// Only run if there's an anchor element to scroll to
|
|||
|
if (!anchor) return;
|
|||
|
|
|||
|
// Reset the anchor element's ID
|
|||
|
anchor.id = anchor.getAttribute('data-scroll-id');
|
|||
|
|
|||
|
// Scroll to the anchored content
|
|||
|
smoothScroll.animateScroll(anchor, toggle);
|
|||
|
|
|||
|
// Reset anchor and toggle
|
|||
|
anchor = null;
|
|||
|
toggle = null;
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* If smooth scroll element clicked, animate scroll
|
|||
|
*/
|
|||
|
var clickHandler = function (event) {
|
|||
|
|
|||
|
// Don't run if the user prefers reduced motion
|
|||
|
if (reduceMotion(settings)) return;
|
|||
|
|
|||
|
// Don't run if right-click or command/control + click
|
|||
|
if (event.button !== 0 || event.metaKey || event.ctrlKey) return;
|
|||
|
|
|||
|
// Check if a smooth scroll link was clicked
|
|||
|
toggle = event.target.closest(selector);
|
|||
|
if (!toggle || toggle.tagName.toLowerCase() !== 'a' || event.target.closest(settings.ignore)) return;
|
|||
|
|
|||
|
// Only run if link is an anchor and points to the current page
|
|||
|
if (toggle.hostname !== window.location.hostname || toggle.pathname !== window.location.pathname || !/#/.test(toggle.href)) return;
|
|||
|
|
|||
|
// Get the sanitized hash
|
|||
|
var hash;
|
|||
|
try {
|
|||
|
hash = escapeCharacters(decodeURIComponent(toggle.hash));
|
|||
|
} catch(e) {
|
|||
|
hash = escapeCharacters(toggle.hash);
|
|||
|
}
|
|||
|
|
|||
|
// If the hash is empty, scroll to the top of the page
|
|||
|
if (hash === '#') {
|
|||
|
|
|||
|
// Prevent default link behavior
|
|||
|
event.preventDefault();
|
|||
|
|
|||
|
// Set the anchored element
|
|||
|
anchor = document.body;
|
|||
|
|
|||
|
// Save or create the ID as a data attribute and remove it (prevents scroll jump)
|
|||
|
var id = anchor.id ? anchor.id : 'smooth-scroll-top';
|
|||
|
anchor.setAttribute('data-scroll-id', id);
|
|||
|
anchor.id = '';
|
|||
|
|
|||
|
// If no hash change event will happen, fire manually
|
|||
|
// Otherwise, update the hash
|
|||
|
if (window.location.hash.substring(1) === id) {
|
|||
|
hashChangeHandler();
|
|||
|
} else {
|
|||
|
window.location.hash = id;
|
|||
|
}
|
|||
|
|
|||
|
return;
|
|||
|
|
|||
|
}
|
|||
|
|
|||
|
// Get the anchored element
|
|||
|
anchor = document.querySelector(hash);
|
|||
|
|
|||
|
// If anchored element exists, save the ID as a data attribute and remove it (prevents scroll jump)
|
|||
|
if (!anchor) return;
|
|||
|
anchor.setAttribute('data-scroll-id', anchor.id);
|
|||
|
anchor.id = '';
|
|||
|
|
|||
|
// If no hash change event will happen, fire manually
|
|||
|
if (toggle.hash === window.location.hash) {
|
|||
|
event.preventDefault();
|
|||
|
hashChangeHandler();
|
|||
|
}
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* On window scroll and resize, only run events at a rate of 15fps for better performance
|
|||
|
*/
|
|||
|
var resizeThrottler = function (event) {
|
|||
|
if (!eventTimeout) {
|
|||
|
eventTimeout = setTimeout((function() {
|
|||
|
eventTimeout = null; // Reset timeout
|
|||
|
headerHeight = getHeaderHeight(fixedHeader); // Get the height of a fixed header if one exists
|
|||
|
}), 66);
|
|||
|
}
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Destroy the current initialization.
|
|||
|
*/
|
|||
|
smoothScroll.destroy = function () {
|
|||
|
|
|||
|
// If plugin isn't already initialized, stop
|
|||
|
if (!settings) return;
|
|||
|
|
|||
|
// Remove event listeners
|
|||
|
document.removeEventListener('click', clickHandler, false);
|
|||
|
window.removeEventListener('resize', resizeThrottler, false);
|
|||
|
|
|||
|
// Cancel any scrolls-in-progress
|
|||
|
smoothScroll.cancelScroll();
|
|||
|
|
|||
|
// Reset variables
|
|||
|
settings = null;
|
|||
|
anchor = null;
|
|||
|
toggle = null;
|
|||
|
fixedHeader = null;
|
|||
|
headerHeight = null;
|
|||
|
eventTimeout = null;
|
|||
|
animationInterval = null;
|
|||
|
};
|
|||
|
|
|||
|
/**
|
|||
|
* Initialize Smooth Scroll
|
|||
|
* @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 = settings.header ? document.querySelector(settings.header) : null; // Get the fixed header
|
|||
|
headerHeight = getHeaderHeight(fixedHeader);
|
|||
|
|
|||
|
// When a toggle is clicked, run the click handler
|
|||
|
document.addEventListener('click', clickHandler, false);
|
|||
|
|
|||
|
// Listen for hash changes
|
|||
|
window.addEventListener('hashchange', hashChangeHandler, false);
|
|||
|
|
|||
|
// If window is resized and there's a fixed header, recalculate its size
|
|||
|
if (fixedHeader) {
|
|||
|
window.addEventListener('resize', resizeThrottler, false);
|
|||
|
}
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Initialize plugin
|
|||
|
//
|
|||
|
|
|||
|
smoothScroll.init(options);
|
|||
|
|
|||
|
|
|||
|
//
|
|||
|
// Public APIs
|
|||
|
//
|
|||
|
|
|||
|
return smoothScroll;
|
|||
|
|
|||
|
};
|
|||
|
|
|||
|
return SmoothScroll;
|
|||
|
|
|||
|
}));
|