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/*! |
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* jQuery.scrollTo |
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* Copyright (c) 2007-2015 Ariel Flesler - aflesler ○ gmail • com | http://flesler.blogspot.com |
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* Licensed under MIT |
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* http://flesler.blogspot.com/2007/10/jqueryscrollto.html |
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* @projectDescription Lightweight, cross-browser and highly customizable animated scrolling with jQuery |
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* @author Ariel Flesler |
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* @version 2.1.2 |
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*/ |
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;(function(factory) { |
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'use strict'; |
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if (typeof define === 'function' && define.amd) { |
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// AMD |
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define(['jquery'], factory); |
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} else if (typeof module !== 'undefined' && module.exports) { |
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// CommonJS |
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module.exports = factory(require('jquery')); |
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} else { |
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// Global |
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factory(jQuery); |
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} |
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})(function($) { |
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'use strict'; |
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|
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var $scrollTo = $.scrollTo = function(target, duration, settings) { |
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return $(window).scrollTo(target, duration, settings); |
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}; |
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|
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$scrollTo.defaults = { |
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axis:'xy', |
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duration: 0, |
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limit:true |
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}; |
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|
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function isWin(elem) { |
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return !elem.nodeName || |
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$.inArray(elem.nodeName.toLowerCase(), ['iframe','#document','html','body']) !== -1; |
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} |
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|
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$.fn.scrollTo = function(target, duration, settings) { |
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if (typeof duration === 'object') { |
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settings = duration; |
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duration = 0; |
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} |
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if (typeof settings === 'function') { |
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settings = { onAfter:settings }; |
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} |
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if (target === 'max') { |
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target = 9e9; |
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} |
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|
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settings = $.extend({}, $scrollTo.defaults, settings); |
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// Speed is still recognized for backwards compatibility |
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duration = duration || settings.duration; |
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// Make sure the settings are given right |
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var queue = settings.queue && settings.axis.length > 1; |
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if (queue) { |
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// Let's keep the overall duration |
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duration /= 2; |
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} |
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settings.offset = both(settings.offset); |
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settings.over = both(settings.over); |
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|
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return this.each(function() { |
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// Null target yields nothing, just like jQuery does |
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if (target === null) return; |
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|
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var win = isWin(this), |
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elem = win ? this.contentWindow || window : this, |
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$elem = $(elem), |
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targ = target, |
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attr = {}, |
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toff; |
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|
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switch (typeof targ) { |
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// A number will pass the regex |
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case 'number': |
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case 'string': |
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if (/^([+-]=?)?\d+(\.\d+)?(px|%)?$/.test(targ)) { |
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targ = both(targ); |
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// We are done |
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break; |
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} |
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// Relative/Absolute selector |
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targ = win ? $(targ) : $(targ, elem); |
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/* falls through */ |
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case 'object': |
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if (targ.length === 0) return; |
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// DOMElement / jQuery |
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if (targ.is || targ.style) { |
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// Get the real position of the target |
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toff = (targ = $(targ)).offset(); |
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} |
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} |
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|
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var offset = $.isFunction(settings.offset) && settings.offset(elem, targ) || settings.offset; |
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|
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$.each(settings.axis.split(''), function(i, axis) { |
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var Pos = axis === 'x' ? 'Left' : 'Top', |
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pos = Pos.toLowerCase(), |
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key = 'scroll' + Pos, |
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prev = $elem[key](), |
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max = $scrollTo.max(elem, axis); |
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|
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if (toff) {// jQuery / DOMElement |
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attr[key] = toff[pos] + (win ? 0 : prev - $elem.offset()[pos]); |
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|
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// If it's a dom element, reduce the margin |
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if (settings.margin) { |
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attr[key] -= parseInt(targ.css('margin'+Pos), 10) || 0; |
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attr[key] -= parseInt(targ.css('border'+Pos+'Width'), 10) || 0; |
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} |
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|
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attr[key] += offset[pos] || 0; |
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|
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if (settings.over[pos]) { |
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// Scroll to a fraction of its width/height |
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attr[key] += targ[axis === 'x'?'width':'height']() * settings.over[pos]; |
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} |
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} else { |
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var val = targ[pos]; |
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// Handle percentage values |
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attr[key] = val.slice && val.slice(-1) === '%' ? |
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parseFloat(val) / 100 * max |
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: val; |
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} |
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|
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// Number or 'number' |
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if (settings.limit && /^\d+$/.test(attr[key])) { |
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// Check the limits |
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attr[key] = attr[key] <= 0 ? 0 : Math.min(attr[key], max); |
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} |
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|
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// Don't waste time animating, if there's no need. |
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if (!i && settings.axis.length > 1) { |
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if (prev === attr[key]) { |
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// No animation needed |
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attr = {}; |
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} else if (queue) { |
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// Intermediate animation |
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animate(settings.onAfterFirst); |
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// Don't animate this axis again in the next iteration. |
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attr = {}; |
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} |
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} |
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}); |
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|
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animate(settings.onAfter); |
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|
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function animate(callback) { |
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var opts = $.extend({}, settings, { |
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// The queue setting conflicts with animate() |
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// Force it to always be true |
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queue: true, |
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duration: duration, |
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complete: callback && function() { |
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callback.call(elem, targ, settings); |
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} |
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}); |
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$elem.animate(attr, opts); |
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} |
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}); |
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}; |
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|
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// Max scrolling position, works on quirks mode |
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// It only fails (not too badly) on IE, quirks mode. |
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$scrollTo.max = function(elem, axis) { |
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var Dim = axis === 'x' ? 'Width' : 'Height', |
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scroll = 'scroll'+Dim; |
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|
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if (!isWin(elem)) |
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return elem[scroll] - $(elem)[Dim.toLowerCase()](); |
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|
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var size = 'client' + Dim, |
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doc = elem.ownerDocument || elem.document, |
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html = doc.documentElement, |
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body = doc.body; |
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|
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return Math.max(html[scroll], body[scroll]) - Math.min(html[size], body[size]); |
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}; |
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|
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function both(val) { |
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return $.isFunction(val) || $.isPlainObject(val) ? val : { top:val, left:val }; |
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} |
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|
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// Add special hooks so that window scroll properties can be animated |
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$.Tween.propHooks.scrollLeft = |
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$.Tween.propHooks.scrollTop = { |
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get: function(t) { |
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return $(t.elem)[t.prop](); |
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}, |
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set: function(t) { |
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var curr = this.get(t); |
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// If interrupt is true and user scrolled, stop animating |
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if (t.options.interrupt && t._last && t._last !== curr) { |
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return $(t.elem).stop(); |
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} |
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var next = Math.round(t.now); |
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// Don't waste CPU |
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// Browsers don't render floating point scroll |
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if (curr !== next) { |
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$(t.elem)[t.prop](next); |
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t._last = this.get(t); |
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} |
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} |
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}; |
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|
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// AMD requirement |
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return $scrollTo; |
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}); |
