Hyperdonat

/**

 * jQuery.ScrollTo

 * Copyright (c) 2007-2009 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com

 * Dual licensed under MIT and GPL.

 * Date: 3/9/2009

 *

 * @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 1.4.1

 *

 * @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.

 *                - 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... stay away!

        // 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],

                                        Dim = axis == 'x' ? 'Width' : 'Height';

                                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[Dim.toLowerCase()]() * settings.over[pos];

                                }else

                                        attr[key] = targ[pos];

                                // Number or 'number'

                                if( /^\d+$/.test(attr[key]) )

                                        // Check the limits

                                        attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max(Dim) );

                                // 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);

                                });

                        };

                        // Max scrolling position, works on quirks mode

                        // It only fails (not too badly) on IE, quirks mode.

                        function max( Dim ){

                                var scroll = 'scroll'+Dim;

                                if( !win )

                                        return elem[scroll];

                                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]   );

                        };

                }).end();

        };

        function both( val ){

                return typeof val == 'object' ? val : { top:val, left:val };

        };

})( jQuery );