650 lines
19 KiB
JavaScript
650 lines
19 KiB
JavaScript
/*!
|
||
* smooth-scroll v16.1.2
|
||
* Animate scrolling to anchor links
|
||
* (c) 2020 Chris Ferdinandi
|
||
* MIT License
|
||
* http://github.com/cferdinandi/smooth-scroll
|
||
*/
|
||
|
||
(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';
|
||
|
||
//
|
||
// Default settings
|
||
//
|
||
|
||
var defaults = {
|
||
|
||
// Selectors
|
||
ignore: '[data-scroll-ignore]',
|
||
header: null,
|
||
topOnEmptyHash: true,
|
||
|
||
// Speed & Duration
|
||
speed: 500,
|
||
speedAsDuration: false,
|
||
durationMax: null,
|
||
durationMin: null,
|
||
clip: true,
|
||
offset: 0,
|
||
|
||
// Easing
|
||
easing: 'easeInOutCubic',
|
||
customEasing: null,
|
||
|
||
// History
|
||
updateURL: true,
|
||
popstate: true,
|
||
|
||
// Custom Events
|
||
emitEvents: true
|
||
|
||
};
|
||
|
||
|
||
//
|
||
// Utility Methods
|
||
//
|
||
|
||
/**
|
||
* Check if browser supports required methods
|
||
* @return {Boolean} Returns true if all required methods are supported
|
||
*/
|
||
var supports = function () {
|
||
return (
|
||
'querySelector' in document &&
|
||
'addEventListener' in window &&
|
||
'requestAnimationFrame' in window &&
|
||
'closest' in window.Element.prototype
|
||
);
|
||
};
|
||
|
||
/**
|
||
* Merge two or more objects together.
|
||
* @param {Object} objects The objects to merge together
|
||
* @returns {Object} Merged values of defaults and options
|
||
*/
|
||
var extend = function () {
|
||
var merged = {};
|
||
Array.prototype.forEach.call(arguments, (function (obj) {
|
||
for (var key in obj) {
|
||
if (!obj.hasOwnProperty(key)) return;
|
||
merged[key] = obj[key];
|
||
}
|
||
}));
|
||
return merged;
|
||
};
|
||
|
||
/**
|
||
* Check to see if user prefers reduced motion
|
||
* @param {Object} settings Script settings
|
||
*/
|
||
var reduceMotion = function () {
|
||
if ('matchMedia' in window && window.matchMedia('(prefers-reduced-motion)').matches) {
|
||
return true;
|
||
}
|
||
return false;
|
||
};
|
||
|
||
/**
|
||
* 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
|
||
* @author Mathias Bynens
|
||
* @link https://github.com/mathiasbynens/CSS.escape
|
||
* @param {String} id The anchor ID to 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 sanitized hash
|
||
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 document's height
|
||
* @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
|
||
);
|
||
};
|
||
|
||
/**
|
||
* Calculate how far to scroll
|
||
* Clip support added by robjtede - https://github.com/cferdinandi/smooth-scroll/issues/405
|
||
* @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
|
||
* @param {Boolean} clip If true, adjust scroll distance to prevent abrupt stops near the bottom of the page
|
||
* @returns {Number}
|
||
*/
|
||
var getEndLocation = function (anchor, headerHeight, offset, clip) {
|
||
var location = 0;
|
||
if (anchor.offsetParent) {
|
||
do {
|
||
location += anchor.offsetTop;
|
||
anchor = anchor.offsetParent;
|
||
} while (anchor);
|
||
}
|
||
location = Math.max(location - headerHeight - offset, 0);
|
||
if (clip) {
|
||
location = Math.min(location, getDocumentHeight() - window.innerHeight);
|
||
}
|
||
return location;
|
||
};
|
||
|
||
/**
|
||
* 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);
|
||
};
|
||
|
||
/**
|
||
* Calculate the speed to use for the animation
|
||
* @param {Number} distance The distance to travel
|
||
* @param {Object} settings The plugin settings
|
||
* @return {Number} How fast to animate
|
||
*/
|
||
var getSpeed = function (distance, settings) {
|
||
var speed = settings.speedAsDuration ? settings.speed : Math.abs(distance / 1000 * settings.speed);
|
||
if (settings.durationMax && speed > settings.durationMax) return settings.durationMax;
|
||
if (settings.durationMin && speed < settings.durationMin) return settings.durationMin;
|
||
return parseInt(speed, 10);
|
||
};
|
||
|
||
var setHistory = function (options) {
|
||
|
||
// Make sure this should run
|
||
if (!history.replaceState || !options.updateURL || history.state) return;
|
||
|
||
// Get the hash to use
|
||
var hash = window.location.hash;
|
||
hash = hash ? hash : '';
|
||
|
||
// Set a default history
|
||
history.replaceState(
|
||
{
|
||
smoothScroll: JSON.stringify(options),
|
||
anchor: hash ? hash : window.pageYOffset
|
||
},
|
||
document.title,
|
||
hash ? hash : window.location.href
|
||
);
|
||
|
||
};
|
||
|
||
/**
|
||
* Update the URL
|
||
* @param {Node} anchor The anchor that was scrolled to
|
||
* @param {Boolean} isNum If true, anchor is a number
|
||
* @param {Object} options Settings for Smooth Scroll
|
||
*/
|
||
var updateURL = function (anchor, isNum, options) {
|
||
|
||
// Bail if the anchor is a number
|
||
if (isNum) return;
|
||
|
||
// Verify that pushState is supported and the updateURL option is enabled
|
||
if (!history.pushState || !options.updateURL) return;
|
||
|
||
// Update URL
|
||
history.pushState(
|
||
{
|
||
smoothScroll: JSON.stringify(options),
|
||
anchor: anchor.id
|
||
},
|
||
document.title,
|
||
anchor === document.documentElement ? '#top' : '#' + anchor.id
|
||
);
|
||
|
||
};
|
||
|
||
/**
|
||
* 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) {
|
||
|
||
// Is scrolling to top of page, blur
|
||
if (anchor === 0) {
|
||
document.body.focus();
|
||
}
|
||
|
||
// 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 !== anchor) {
|
||
anchor.setAttribute('tabindex', '-1');
|
||
anchor.focus();
|
||
anchor.style.outline = 'none';
|
||
}
|
||
window.scrollTo(0 , endLocation);
|
||
|
||
};
|
||
|
||
/**
|
||
* Emit a custom event
|
||
* @param {String} type The event type
|
||
* @param {Object} options The settings object
|
||
* @param {Node} anchor The anchor element
|
||
* @param {Node} toggle The toggle element
|
||
*/
|
||
var emitEvent = function (type, options, anchor, toggle) {
|
||
if (!options.emitEvents || typeof window.CustomEvent !== 'function') return;
|
||
var event = new CustomEvent(type, {
|
||
bubbles: true,
|
||
detail: {
|
||
anchor: anchor,
|
||
toggle: toggle
|
||
}
|
||
});
|
||
document.dispatchEvent(event);
|
||
};
|
||
|
||
|
||
//
|
||
// SmoothScroll Constructor
|
||
//
|
||
|
||
var SmoothScroll = function (selector, options) {
|
||
|
||
//
|
||
// Variables
|
||
//
|
||
|
||
var smoothScroll = {}; // Object for public APIs
|
||
var settings, anchor, toggle, fixedHeader, eventTimeout, animationInterval;
|
||
|
||
|
||
//
|
||
// Methods
|
||
//
|
||
|
||
/**
|
||
* Cancel a scroll-in-progress
|
||
*/
|
||
smoothScroll.cancelScroll = function (noEvent) {
|
||
cancelAnimationFrame(animationInterval);
|
||
animationInterval = null;
|
||
if (noEvent) return;
|
||
emitEvent('scrollCancel', settings);
|
||
};
|
||
|
||
/**
|
||
* 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) {
|
||
|
||
// Cancel any in progress scrolls
|
||
smoothScroll.cancelScroll();
|
||
|
||
// Local settings
|
||
var _settings = 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 (_settings.header && !fixedHeader) {
|
||
// Get the fixed header if not already set
|
||
fixedHeader = document.querySelector(_settings.header);
|
||
}
|
||
var headerHeight = getHeaderHeight(fixedHeader);
|
||
var endLocation = isNum ? anchor : getEndLocation(anchorElem, headerHeight, parseInt((typeof _settings.offset === 'function' ? _settings.offset(anchor, toggle) : _settings.offset), 10), _settings.clip); // Location to scroll to
|
||
var distance = endLocation - startLocation; // distance to travel
|
||
var documentHeight = getDocumentHeight();
|
||
var timeLapsed = 0;
|
||
var speed = getSpeed(distance, _settings);
|
||
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(true);
|
||
|
||
// Bring the anchored element into focus
|
||
adjustFocus(anchor, endLocation, isNum);
|
||
|
||
// Emit a custom event
|
||
emitEvent('scrollStop', _settings, anchor, toggle);
|
||
|
||
// Reset start
|
||
start = null;
|
||
animationInterval = null;
|
||
|
||
return true;
|
||
|
||
}
|
||
};
|
||
|
||
/**
|
||
* Loop scrolling animation
|
||
*/
|
||
var loopAnimateScroll = function (timestamp) {
|
||
if (!start) { start = timestamp; }
|
||
timeLapsed += timestamp - start;
|
||
percentage = speed === 0 ? 0 : (timeLapsed / speed);
|
||
percentage = (percentage > 1) ? 1 : percentage;
|
||
position = startLocation + (distance * easingPattern(_settings, percentage));
|
||
window.scrollTo(0, Math.floor(position));
|
||
if (!stopAnimateScroll(position, endLocation)) {
|
||
animationInterval = 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);
|
||
}
|
||
|
||
// Update the URL
|
||
updateURL(anchor, isNum, _settings);
|
||
|
||
// If the user prefers reduced motion, jump to location
|
||
if (reduceMotion()) {
|
||
window.scrollTo(0, Math.floor(endLocation));
|
||
return;
|
||
}
|
||
|
||
// Emit a custom event
|
||
emitEvent('scrollStart', _settings, anchor, toggle);
|
||
|
||
// Start scrolling animation
|
||
smoothScroll.cancelScroll(true);
|
||
window.requestAnimationFrame(loopAnimateScroll);
|
||
|
||
};
|
||
|
||
/**
|
||
* If smooth scroll element clicked, animate scroll
|
||
*/
|
||
var clickHandler = function (event) {
|
||
|
||
// Don't run if event was canceled but still bubbled up
|
||
// By @mgreter - https://github.com/cferdinandi/smooth-scroll/pull/462/
|
||
if (event.defaultPrevented) return;
|
||
|
||
// Don't run if right-click or command/control + click or shift + click
|
||
if (event.button !== 0 || event.metaKey || event.ctrlKey || event.shiftKey) return;
|
||
|
||
// Check if event.target has closest() method
|
||
// By @totegi - https://github.com/cferdinandi/smooth-scroll/pull/401/
|
||
if (!('closest' in event.target)) 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 an escaped version of the hash
|
||
var hash;
|
||
try {
|
||
hash = escapeCharacters(decodeURIComponent(toggle.hash));
|
||
} catch(e) {
|
||
hash = escapeCharacters(toggle.hash);
|
||
}
|
||
|
||
// Get the anchored element
|
||
var anchor;
|
||
if (hash === '#') {
|
||
if (!settings.topOnEmptyHash) return;
|
||
anchor = document.documentElement;
|
||
} else {
|
||
anchor = document.querySelector(hash);
|
||
}
|
||
anchor = !anchor && hash === '#top' ? document.documentElement : anchor;
|
||
|
||
// If anchored element exists, scroll to it
|
||
if (!anchor) return;
|
||
event.preventDefault();
|
||
setHistory(settings);
|
||
smoothScroll.animateScroll(anchor, toggle);
|
||
|
||
};
|
||
|
||
/**
|
||
* Animate scroll on popstate events
|
||
*/
|
||
var popstateHandler = function (event) {
|
||
|
||
// Stop if history.state doesn't exist (ex. if clicking on a broken anchor link).
|
||
// fixes `Cannot read property 'smoothScroll' of null` error getting thrown.
|
||
if (history.state === null) return;
|
||
|
||
// Only run if state is a popstate record for this instantiation
|
||
if (!history.state.smoothScroll || history.state.smoothScroll !== JSON.stringify(settings)) return;
|
||
|
||
// Only run if state includes an anchor
|
||
|
||
// if (!history.state.anchor && history.state.anchor !== 0) return;
|
||
|
||
// Get the anchor
|
||
var anchor = history.state.anchor;
|
||
if (typeof anchor === 'string' && anchor) {
|
||
anchor = document.querySelector(escapeCharacters(history.state.anchor));
|
||
if (!anchor) return;
|
||
}
|
||
|
||
// Animate scroll to anchor link
|
||
smoothScroll.animateScroll(anchor, null, {updateURL: false});
|
||
|
||
};
|
||
|
||
/**
|
||
* 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('popstate', popstateHandler, false);
|
||
|
||
// Cancel any scrolls-in-progress
|
||
smoothScroll.cancelScroll();
|
||
|
||
// Reset variables
|
||
settings = null;
|
||
anchor = null;
|
||
toggle = null;
|
||
fixedHeader = null;
|
||
eventTimeout = null;
|
||
animationInterval = null;
|
||
|
||
};
|
||
|
||
/**
|
||
* Initialize Smooth Scroll
|
||
* @param {Object} options User settings
|
||
*/
|
||
var init = function () {
|
||
|
||
// feature test
|
||
if (!supports()) throw 'Smooth Scroll: This browser does not support the required JavaScript methods and browser APIs.';
|
||
|
||
// 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
|
||
|
||
// When a toggle is clicked, run the click handler
|
||
document.addEventListener('click', clickHandler, false);
|
||
|
||
// If updateURL and popState are enabled, listen for pop events
|
||
if (settings.updateURL && settings.popstate) {
|
||
window.addEventListener('popstate', popstateHandler, false);
|
||
}
|
||
|
||
};
|
||
|
||
|
||
//
|
||
// Initialize plugin
|
||
//
|
||
|
||
init();
|
||
|
||
|
||
//
|
||
// Public APIs
|
||
//
|
||
|
||
return smoothScroll;
|
||
|
||
};
|
||
|
||
return SmoothScroll;
|
||
|
||
}));
|