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|
;(function( $ ){
var $scrollTo = $.scrollTo = function( target, duration, settings ){
$scrollTo.window().scrollTo( target, duration, settings );
};
$scrollTo.defaults = {
axis:'y',
duration:1
};
//returns the element that needs to be animated to scroll the window
$scrollTo.window = function(){
return $( $.browser.safari ? 'body' : 'html' );
};
$.fn.scrollTo = function( target, duration, settings ){
if( typeof duration == 'object' ){
settings = duration;
duration = 0;
}
settings = $.extend( {}, $scrollTo.defaults, settings );
duration = duration || settings.speed || settings.duration;//speed is still recognized for backwards compatibility
settings.queue = settings.queue && settings.axis.length > 1;//make sure the settings are given right
if( settings.queue )
duration /= 2;//let's keep the overall speed, the same.
settings.offset = both( settings.offset );
settings.over = both( settings.over );
return this.each(function(){
var elem = this, $elem = $(elem),
t = target, toff, attr = {},
win = $elem.is('html,body');
switch( typeof t ){
case 'number'://will pass the regex
case 'string':
if( /^([+-]=)?\d+(px)?$/.test(t) ){
t = both( t );
break;//we are done
}
t = $(t,this);// relative selector, no break!
case 'object':
if( t.is || t.style )//DOM/jQuery
toff = (t = $(t)).offset();//get the real position of the target
}
$.each( settings.axis.split(''), function( i, axis ){
var Pos = axis == 'x' ? 'Left' : 'Top',
pos = Pos.toLowerCase(),
key = 'scroll' + Pos,
act = elem[key],
Dim = axis == 'x' ? 'Width' : 'Height',
dim = Dim.toLowerCase();
if( toff ){//jQuery/DOM
attr[key] = toff[pos] + ( win ? 0 : act - $elem.offset()[pos] );
if( settings.margin ){//if it's a dom element, reduce the margin
attr[key] -= parseInt(t.css('margin'+Pos)) || 0;
attr[key] -= parseInt(t.css('border'+Pos+'Width')) || 0;
}
attr[key] += settings.offset[pos] || 0;//add/deduct the offset
if( settings.over[pos] )//scroll to a fraction of its width/height
attr[key] += t[dim]() * settings.over[pos];
}else
attr[key] = t[pos];//remove the unnecesary 'px'
if( /^\d+$/.test(attr[key]) )//number or 'number'
attr[key] = attr[key] <= 0 ? 0 : Math.min( attr[key], max(Dim) );//check the limits
if( !i && settings.queue ){//queueing each axis is required
if( act != attr[key] )//don't waste time animating, if there's no need.
animate( settings.onAfterFirst );//intermediate animation
delete attr[key];//don't animate this axis again in the next iteration.
}
});
animate( settings.onAfter );
function animate( callback ){
$elem.animate( attr, duration, settings.easing, callback && function(){
callback.call(this, target);
});
};
function max( Dim ){
var el = win ? $.browser.opera ? document.body : document.documentElement : elem;
return el['scroll'+Dim] - el['client'+Dim];
};
});
};
function both( val ){
return typeof val == 'object' ? val : { top:val, left:val };
};
})( jQuery ); |
