Team:ZJU-China/JS/jquery.scrollTo.js

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Latest revision as of 18:18, 15 October 2014

/**

* jQuery.ScrollTo
* Copyright (c) 2007-2008 Ariel Flesler - aflesler(at)gmail(dot)com | http://flesler.blogspot.com
* Dual licensed under MIT and GPL.
* Date: 9/11/2008
*
* @projectDescription Easy element scrolling using jQuery.
* http://flesler.blogspot.com/2007/10/jqueryscrollto.html
* Tested with jQuery 1.2.6. On FF 2/3, IE 6/7, Opera 9.2/5 and Safari 3. on Windows.
*
* @author Ariel Flesler
* @version 1.4
*
* @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.
* @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:'y', duration: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(){ // Just store it, we might need it var win = this.parentWindow || this.defaultView, // If it's a document, get its iframe or the window if it's THE document elem = this.nodeName == '#document' ? win.frameElement || win : this, // Get the corresponding document doc = elem.contentDocument || (elem.contentWindow || elem).document, isWin = elem.setInterval;

return elem.nodeName == 'IFRAME' || isWin && /safari/.test(navigator.userAgent.toLowerCase()) ? doc.body : isWin ? doc.documentElement : this; }); };

$.fn.scrollTo = function( target, duration, settings ){ if( typeof duration == 'object' ){ settings = duration; duration = 0; } if( typeof settings == 'function' ) settings = { onAfter:settings };

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+(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', dim = Dim.toLowerCase();

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]() * 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); }); }; function max( Dim ){ var attr ='scroll'+Dim, doc = elem.ownerDocument;

return win ? Math.max( doc.documentElement[attr], doc.body[attr] ) : elem[attr]; }; }).end(); };

function both( val ){ return typeof val == 'object' ? val : { top:val, left:val }; };

})( jQuery );