;(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
};
$scrollTo.window = function( scope ){
return $(window)._scrollable();
};
$.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 );
duration = duration || settings.speed || settings.duration;
settings.queue = settings.queue && settings.axis.length > 1;
if( settings.queue )
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();
};
$scrollTo.max = function( elem, axis ){
var Dim = axis == 'x' ? 'Width' : 'Height',
scroll = 'scroll'+Dim;
if( !$(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 );