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Edit File: jquery-scrollTo.js

/*!
 * jQuery.scrollTo
 * Copyright (c) 2007 Ariel Flesler - aflesler ○ gmail • com | https://github.com/flesler
 * Licensed under MIT
 * https://github.com/flesler/jquery.scrollTo
 * @projectDescription Lightweight, cross-browser and highly customizable animated scrolling with jQuery
 * @author Ariel Flesler
 * @version 2.1.3
 */
; (function(factory) {
	'use strict';
	if (typeof define === 'function' && define.amd) {
		// AMD
		define(['jquery'], factory);
	} else if (typeof module !== 'undefined' && module.exports) {
		// CommonJS
		module.exports = factory(require('jquery'));
	} else {
		// Global
		factory(jQuery);
	}
})(function($) {
	'use strict';

var $scrollTo = $.scrollTo = function(target, duration, settings) {
		return $(window).scrollTo(target, duration, settings);
	};

$scrollTo.defaults = {
		axis: 'xy',
		duration: 0,
		limit: true
	};

function isWin(elem) {
		return !elem.nodeName ||
			$.inArray(elem.nodeName.toLowerCase(), ['iframe', '#document', 'html', 'body']) !== -1;
	}

function isFunction(obj) {
		// Brought from jQuery since it's deprecated
		return typeof obj === 'function'
	}

$.fn.scrollTo = function(target, duration, settings) {
		if (typeof duration === 'object') {
			settings = duration;
			duration = 0;
		}
		if (typeof settings === 'function') {
			settings = { onAfter: settings };
		}
		if (target === 'max') {
			target = 9e9;
		}

settings = $.extend({}, $scrollTo.defaults, settings);
		// Speed is still recognized for backwards compatibility
		duration = duration || settings.duration;
		// Make sure the settings are given right
		var queue = settings.queue && settings.axis.length > 1;
		if (queue) {
			// Let's keep the overall duration
			duration /= 2;
		}
		settings.offset = both(settings.offset);
		settings.over = both(settings.over);

return this.each(function() {
			// Null target yields nothing, just like jQuery does
			if (target === null) return;

var win = isWin(this),
				elem = win ? this.contentWindow || window : this,
				$elem = $(elem),
				targ = target,
				attr = {},
				toff;

switch (typeof targ) {
				// A number will pass the regex
				case 'number':
				case 'string':
					if (/^([+-]=?)?\d+(\.\d+)?(px|%)?$/.test(targ)) {
						targ = both(targ);
						// We are done
						break;
					}
					// Relative/Absolute selector
					targ = win ? $(targ) : $(targ, elem);
				/* falls through */
				case 'object':
					if (targ.length === 0) return;
					// DOMElement / jQuery
					if (targ.is || targ.style) {
						// Get the real position of the target
						toff = (targ = $(targ)).offset();
					}
			}

var offset = isFunction(settings.offset) && settings.offset(elem, targ) || settings.offset;

$.each(settings.axis.split(''), function(i, axis) {
				var Pos = axis === 'x' ? 'Left' : 'Top',
					pos = Pos.toLowerCase(),
					key = 'scroll' + Pos,
					prev = $elem[key](),
					max = $scrollTo.max(elem, axis);

if (toff) {// jQuery / DOMElement
					attr[key] = toff[pos] + (win ? 0 : prev - $elem.offset()[pos]);

// If it's a dom element, reduce the margin
					if (settings.margin) {
						attr[key] -= parseInt(targ.css('margin' + Pos), 10) || 0;
						attr[key] -= parseInt(targ.css('border' + Pos + 'Width'), 10) || 0;
					}

attr[key] += offset[pos] || 0;

if (settings.over[pos]) {
						// Scroll to a fraction of its width/height
						attr[key] += targ[axis === 'x' ? 'width' : 'height']() * settings.over[pos];
					}
				} else {
					var val = targ[pos];
					// Handle percentage values
					attr[key] = val.slice && val.slice(-1) === '%' ?
						parseFloat(val) / 100 * max
						: val;
				}

// Number or 'number'
				if (settings.limit && /^\d+$/.test(attr[key])) {
					// Check the limits
					attr[key] = attr[key] <= 0 ? 0 : Math.min(attr[key], max);
				}

// Don't waste time animating, if there's no need.
				if (!i && settings.axis.length > 1) {
					if (prev === attr[key]) {
						// No animation needed
						attr = {};
					} else if (queue) {
						// Intermediate animation
						animate(settings.onAfterFirst);
						// Don't animate this axis again in the next iteration.
						attr = {};
					}
				}
			});

animate(settings.onAfter);

// Max scrolling position, works on quirks mode
	// It only fails (not too badly) on IE, quirks mode.
	$scrollTo.max = function(elem, axis) {
		var Dim = axis === 'x' ? 'Width' : 'Height',
			scroll = 'scroll' + Dim;

if (!isWin(elem))
			return elem[scroll] - $(elem)[Dim.toLowerCase()]();

var size = 'client' + Dim,
			doc = elem.ownerDocument || elem.document,
			html = doc.documentElement,
			body = doc.body;

return Math.max(html[scroll], body[scroll]) - Math.min(html[size], body[size]);
	};

function both(val) {
		return isFunction(val) || $.isPlainObject(val) ? val : { top: val, left: val };
	}

// Add special hooks so that window scroll properties can be animated
	$.Tween.propHooks.scrollLeft =
		$.Tween.propHooks.scrollTop = {
			get: function(t) {
				return $(t.elem)[t.prop]();
			},
			set: function(t) {
				var curr = this.get(t);
				// If interrupt is true and user scrolled, stop animating
				if (t.options.interrupt && t._last && t._last !== curr) {
					return $(t.elem).stop();
				}
				var next = Math.round(t.now);
				// Don't waste CPU
				// Browsers don't render floating point scroll
				if (curr !== next) {
					$(t.elem)[t.prop](next);
					t._last = this.get(t);
				}
			}
		};

// AMD requirement
	return $scrollTo;
});