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210 lines
5.7 KiB
JavaScript
210 lines
5.7 KiB
JavaScript
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/*!
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* jQuery.scrollTo
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* Copyright (c) 2007-2015 Ariel Flesler - aflesler<a>gmail<d>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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var $scrollTo = $.scrollTo = function(target, duration, settings) {
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return $( window ).scrollTo( target, duration, settings );
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};
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$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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function isWin(elem) {
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return ! elem.nodeName ||
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$.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) !== -1;
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}
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$.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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settings = $.extend( {}, $scrollTo.defaults, settings );
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// Speed is still recognized for backwards compatibility
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duration = duration || settings.duration;
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// Make sure the settings are given right
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var queue = settings.queue && settings.axis.length > 1;
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if (queue) {
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// Let's keep the overall duration
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duration /= 2;
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}
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settings.offset = both( settings.offset );
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settings.over = both( settings.over );
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return this.each(function() {
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// Null target yields nothing, just like jQuery does
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if (target === null) { return; }
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var win = isWin( this ),
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elem = win ? this.contentWindow || window : this,
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$elem = $( elem ),
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targ = target,
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attr = {},
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toff;
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switch (typeof targ) {
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// A number will pass the regex
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case 'number':
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case 'string':
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if (/^([+-]=?)?\d+(\.\d+)?(px|%)?$/.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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var offset = $.isFunction( settings.offset ) && settings.offset( elem, targ ) || settings.offset;
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$.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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if (toff) {// jQuery / DOMElement
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attr[key] = toff[pos] + (win ? 0 : prev - $elem.offset()[pos]);
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// If it's a dom element, reduce the margin
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if (settings.margin) {
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attr[key] -= parseInt( targ.css( 'margin' + Pos ), 10 ) || 0;
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attr[key] -= parseInt( targ.css( 'border' + Pos + 'Width' ), 10 ) || 0;
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}
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attr[key] += offset[pos] || 0;
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if (settings.over[pos]) {
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// Scroll to a fraction of its width/height
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attr[key] += targ[axis === 'x'?'width':'height']() * settings.over[pos];
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}
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} else {
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var val = targ[pos];
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// Handle percentage values
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attr[key] = val.slice && val.slice( -1 ) === '%' ?
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parseFloat( val ) / 100 * max
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: val;
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}
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// Number or 'number'
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if (settings.limit && /^\d+$/.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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// 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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animate( settings.onAfter );
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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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// 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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if ( ! isWin( elem )) {
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return elem[scroll] - $( elem )[Dim.toLowerCase()](); }
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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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return Math.max( html[scroll], body[scroll] ) - Math.min( html[size], body[size] );
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};
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function both(val) {
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return $.isFunction( val ) || $.isPlainObject( val ) ? val : { top:val, left:val };
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}
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// Add special hooks so that window scroll properties can be animated
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$.Tween.propHooks.scrollLeft = $.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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// AMD requirement
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return $scrollTo;
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});
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