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1 /* jshint undef: false */ 2 /* jshint -W065 */ 3 4 /*! 5 * jQuery.scrollTo 6 * Copyright (c) 2007 Ariel Flesler - aflesler ○ gmail • com | https://github.com/flesler 7 * Licensed under MIT 8 * https://github.com/flesler/jquery.scrollTo 9 * @projectDescription Lightweight, cross-browser and highly customizable animated scrolling with jQuery 10 * @author Ariel Flesler 11 * @version 2.1.3 12 */ 13 ;(function(factory) { 14 'use strict'; 15 if (typeof define === 'function' && define.amd) { 16 // AMD 17 define(['jquery'], factory); 18 } else if (typeof module !== 'undefined' && module.exports) { 19 // CommonJS 20 module.exports = factory(require('jquery')); 21 } else { 22 // Global 23 factory(jQuery); 24 } 25 })(function($) { 26 'use strict'; 27 28 var $scrollTo = $.scrollTo = function(target, duration, settings) { 29 return $(window).scrollTo(target, duration, settings); 30 }; 31 32 $scrollTo.defaults = { 33 axis:'xy', 34 duration: 0, 35 limit:true 36 }; 37 38 function isWin(elem) { 39 return !elem.nodeName || 40 $.inArray(elem.nodeName.toLowerCase(), ['iframe','#document','html','body']) !== -1; 41 } 42 43 function isFunction(obj) { 44 // Brought from jQuery since it's deprecated 45 return typeof obj === 'function' 46 } 47 48 $.fn.scrollTo = function(target, duration, settings) { 49 if (typeof duration === 'object') { 50 settings = duration; 51 duration = 0; 52 } 53 if (typeof settings === 'function') { 54 settings = { onAfter:settings }; 55 } 56 if (target === 'max') { 57 target = 9e9; 58 } 59 60 settings = $.extend({}, $scrollTo.defaults, settings); 61 // Speed is still recognized for backwards compatibility 62 duration = duration || settings.duration; 63 // Make sure the settings are given right 64 var queue = settings.queue && settings.axis.length > 1; 65 if (queue) { 66 // Let's keep the overall duration 67 duration /= 2; 68 } 69 settings.offset = both(settings.offset); 70 settings.over = both(settings.over); 71 72 return this.each(function() { 73 // Null target yields nothing, just like jQuery does 74 if (target === null) return; 75 76 var win = isWin(this), 77 elem = win ? this.contentWindow || window : this, 78 $elem = $(elem), 79 targ = target, 80 attr = {}, 81 toff; 82 83 switch (typeof targ) { 84 // A number will pass the regex 85 case 'number': 86 case 'string': 87 if (/^([+-]=?)?\d+(\.\d+)?(px|%)?$/.test(targ)) { 88 targ = both(targ); 89 // We are done 90 break; 91 } 92 // Relative/Absolute selector 93 targ = win ? $(targ) : $(targ, elem); 94 /* falls through */ 95 case 'object': 96 if (targ.length === 0) return; 97 // DOMElement / jQuery 98 if (targ.is || targ.style) { 99 // Get the real position of the target 100 toff = (targ = $(targ)).offset(); 101 } 102 } 103 104 var offset = isFunction(settings.offset) && settings.offset(elem, targ) || settings.offset; 105 106 $.each(settings.axis.split(''), function(i, axis) { 107 var Pos = axis === 'x' ? 'Left' : 'Top', 108 pos = Pos.toLowerCase(), 109 key = 'scroll' + Pos, 110 prev = $elem[key](), 111 max = $scrollTo.max(elem, axis); 112 113 if (toff) {// jQuery / DOMElement 114 attr[key] = toff[pos] + (win ? 0 : prev - $elem.offset()[pos]); 115 116 // If it's a dom element, reduce the margin 117 if (settings.margin) { 118 attr[key] -= parseInt(targ.css('margin'+Pos), 10) || 0; 119 attr[key] -= parseInt(targ.css('border'+Pos+'Width'), 10) || 0; 120 } 121 122 attr[key] += offset[pos] || 0; 123 124 if (settings.over[pos]) { 125 // Scroll to a fraction of its width/height 126 attr[key] += targ[axis === 'x'?'width':'height']() * settings.over[pos]; 127 } 128 } else { 129 var val = targ[pos]; 130 // Handle percentage values 131 attr[key] = val.slice && val.slice(-1) === '%' ? 132 parseFloat(val) / 100 * max 133 : val; 134 } 135 136 // Number or 'number' 137 if (settings.limit && /^\d+$/.test(attr[key])) { 138 // Check the limits 139 attr[key] = attr[key] <= 0 ? 0 : Math.min(attr[key], max); 140 } 141 142 // Don't waste time animating, if there's no need. 143 if (!i && settings.axis.length > 1) { 144 if (prev === attr[key]) { 145 // No animation needed 146 attr = {}; 147 } else if (queue) { 148 // Intermediate animation 149 animate(settings.onAfterFirst); 150 // Don't animate this axis again in the next iteration. 151 attr = {}; 152 } 153 } 154 }); 155 156 animate(settings.onAfter); 157 158 function animate(callback) { 159 var opts = $.extend({}, settings, { 160 // The queue setting conflicts with animate() 161 // Force it to always be true 162 queue: true, 163 duration: duration, 164 complete: callback && function() { 165 callback.call(elem, targ, settings); 166 } 167 }); 168 $elem.animate(attr, opts); 169 } 170 }); 171 }; 172 173 // Max scrolling position, works on quirks mode 174 // It only fails (not too badly) on IE, quirks mode. 175 $scrollTo.max = function(elem, axis) { 176 var Dim = axis === 'x' ? 'Width' : 'Height', 177 scroll = 'scroll'+Dim; 178 179 if (!isWin(elem)) 180 return elem[scroll] - $(elem)[Dim.toLowerCase()](); 181 182 var size = 'client' + Dim, 183 doc = elem.ownerDocument || elem.document, 184 html = doc.documentElement, 185 body = doc.body; 186 187 return Math.max(html[scroll], body[scroll]) - Math.min(html[size], body[size]); 188 }; 189 190 function both(val) { 191 return isFunction(val) || $.isPlainObject(val) ? val : { top:val, left:val }; 192 } 193 194 // Add special hooks so that window scroll properties can be animated 195 $.Tween.propHooks.scrollLeft = 196 $.Tween.propHooks.scrollTop = { 197 get: function(t) { 198 return $(t.elem)[t.prop](); 199 }, 200 set: function(t) { 201 var curr = this.get(t); 202 // If interrupt is true and user scrolled, stop animating 203 if (t.options.interrupt && t._last && t._last !== curr) { 204 return $(t.elem).stop(); 205 } 206 var next = Math.round(t.now); 207 // Don't waste CPU 208 // Browsers don't render floating point scroll 209 if (curr !== next) { 210 $(t.elem)[t.prop](next); 211 t._last = this.get(t); 212 } 213 } 214 }; 215 216 // AMD requirement 217 return $scrollTo; 218 });
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