/** * jQuery.ScrollTo * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com * Dual licensed under MIT and GPL. * Date: 5/25/2009 * * @projectDescription Easy element scrolling using jQuery. * http://flesler.blogspot.com/2007/10/jqueryscrollto.html * Works with jQuery +1.2.6. Tested on FF 2/3, IE 6/7/8, Opera 9.5/6, Safari 3, Chrome 1 on WinXP. * * @author Ariel Flesler * @version 1.4.2 * * @id jQuery.scrollTo * @id jQuery.fn.scrollTo * @param {String, Number, DOMElement, jQuery, Object} target Where to scroll the matched elements. * The different options for target are: * - A number position (will be applied to all axes). * - A string position ('44', '100px', '+=90', etc ) will be applied to all axes * - A jQuery/DOM element ( logically, child of the element to scroll ) * - A string selector, that will be relative to the element to scroll ( 'li:eq(2)', etc ) * - A hash { top:x, left:y }, x and y can be any kind of number/string like above. * - A percentage of the container's dimension/s, for example: 50% to go to the middle. * - The string 'max' for go-to-end. * @param {Number} duration The OVERALL length of the animation, this argument can be the settings object instead. * @param {Object,Function} settings Optional set of settings or the onAfter callback. * @option {String} axis Which axis must be scrolled, use 'x', 'y', 'xy' or 'yx'. * @option {Number} duration The OVERALL length of the animation. * @option {String} easing The easing method for the animation. * @option {Boolean} margin If true, the margin of the target element will be deducted from the final position. * @option {Object, Number} offset Add/deduct from the end position. One number for both axes or { top:x, left:y }. * @option {Object, Number} over Add/deduct the height/width multiplied by 'over', can be { top:x, left:y } when using both axes. * @option {Boolean} queue If true, and both axis are given, the 2nd axis will only be animated after the first one ends. * @option {Function} onAfter Function to be called after the scrolling ends. * @option {Function} onAfterFirst If queuing is activated, this function will be called after the first scrolling ends. * @return {jQuery} Returns the same jQuery object, for chaining. * * @desc Scroll to a fixed position * @example $('div').scrollTo( 340 ); * * @desc Scroll relatively to the actual position * @example $('div').scrollTo( '+=340px', { axis:'y' } ); * * @dec Scroll using a selector (relative to the scrolled element) * @example $('div').scrollTo( 'p.paragraph:eq(2)', 500, { easing:'swing', queue:true, axis:'xy' } ); * * @ Scroll to a DOM element (same for jQuery object) * @example var second_child = document.getElementById('container').firstChild.nextSibling; * $('#container').scrollTo( second_child, { duration:500, axis:'x', onAfter:function(){ * alert('scrolled!!'); * }}); * * @desc Scroll on both axes, to different values * @example $('div').scrollTo( { top: 300, left:'+=200' }, { axis:'xy', offset:-20 } ); */ ;(function( $ ){ var $scrollTo = $.scrollTo = function( target, duration, settings ){ $(window).scrollTo( target, duration, settings ); }; $scrollTo.defaults = { axis:'xy', duration: parseFloat($.fn.jquery) >= 1.3 ? 0 : 1 }; // Returns the element that needs to be animated to scroll the window. // Kept for backwards compatibility (specially for localScroll & serialScroll) $scrollTo.window = function( scope ){ return $(window)._scrollable(); }; // Hack, hack, hack :) // Returns the real elements to scroll (supports window/iframes, documents and regular nodes) $.fn._scrollable = function(){ return this.map(function(){ var elem = this, isWin = !elem.nodeName || $.inArray( elem.nodeName.toLowerCase(), ['iframe','#document','html','body'] ) != -1; if( !isWin ) return elem; var doc = (elem.contentWindow || elem).document || elem.ownerDocument || elem; return $.browser.safari || doc.compatMode == 'BackCompat' ? doc.body : doc.documentElement; }); }; $.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.speed || settings.duration; // Make sure the settings are given right settings.queue = settings.queue && settings.axis.length > 1; if( settings.queue ) // Let's keep the overall duration duration /= 2; settings.offset = both( settings.offset ); settings.over = both( settings.over ); return this._scrollable().each(function(){ var elem = this, $elem = $(elem), targ = target, toff, attr = {}, win = $elem.is('html,body'); switch( typeof targ ){ // A number will pass the regex case 'number': case 'string': if( /^([+-]=)?\d+(\.\d+)?(px|%)?$/.test(targ) ){ targ = both( targ ); // We are done break; } // Relative selector, no break! targ = $(targ,this); case 'object': // DOMElement / jQuery if( targ.is || targ.style ) // Get the real position of the target toff = (targ = $(targ)).offset(); } $.each( settings.axis.split(''), function( i, axis ){ var Pos = axis == 'x' ? 'Left' : 'Top', pos = Pos.toLowerCase(), key = 'scroll' + Pos, old = elem[key], max = $scrollTo.max(elem, axis); if( toff ){// jQuery / DOMElement attr[key] = toff[pos] + ( win ? 0 : old - $elem.offset()[pos] ); // If it's a dom element, reduce the margin if( settings.margin ){ attr[key] -= parseInt(targ.css('margin'+Pos)) || 0; attr[key] -= parseInt(targ.css('border'+Pos+'Width')) || 0; } attr[key] += settings.offset[pos] || 0; if( settings.over[pos] ) // Scroll to a fraction of its width/height attr[key] += targ[axis=='x'?'width':'height']() * settings.over[pos]; }else{ var val = targ[pos]; // Handle percentage values attr[key] = val.slice && val.slice(-1) == '%' ? parseFloat(val) / 100 * max : val; } // Number or 'number' if( /^\d+$/.test(attr[key]) ) // Check the limits attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max ); // Queueing axes if( !i && settings.queue ){ // Don't waste time animating, if there's no need. if( old != attr[key] ) // Intermediate animation animate( settings.onAfterFirst ); // Don't animate this axis again in the next iteration. delete attr[key]; } }); animate( settings.onAfter ); function animate( callback ){ $elem.animate( attr, duration, settings.easing, callback && function(){ callback.call(this, target, settings); }); }; }).end(); }; // Max scrolling position, works on quirks mode // It only fails (not too badly) on IE, quirks mode. $scrollTo.max = function( elem, axis ){ var Dim = axis == 'x' ? 'Width' : 'Height', scroll = 'scroll'+Dim; if( !$(elem).is('html,body') ) return elem[scroll] - $(elem)[Dim.toLowerCase()](); var size = 'client' + Dim, html = elem.ownerDocument.documentElement, body = elem.ownerDocument.body; return Math.max( html[scroll], body[scroll] ) - Math.min( html[size] , body[size] ); }; function both( val ){ return typeof val == 'object' ? val : { top:val, left:val }; }; })( jQuery );