#ScrollTracker ScrollTracker is a tiny plugin which lets you easily do things depending on how far down the page the viewer has scrolled
VIEW DEMO

##Requirements

• jQuery

Installation

Simply include the scrolltracker.js file on your page after your inclusion of jQuery
E.g.

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js"></script>
<script type="text/javascript" src="scrolltracker.js"></script>

##Usage Once included, you'll need to initialize the tracker, and then add at least one callback (a function which is called whenever the page is scrolled) The callback can accept two parameters:

scrollpercent - how far the viewer has scrolled as a percent

scrollpos - the number of pixels the viewer has scrolled
E.g.

$(document).ready(function(){
	//initialize the tracker
	scrollTracker.initialize();
	//add a callback	
	scrollTracker.addObject('body',function(scrollpercent,scrollpos){
		//do something really cool here		
	});
});

##Documentation Beyond the basics, you can take advantage of various other features:

onResize - attach a callback function to this event if you need to handle window resizing.
E.g.

scrollTracker.onResize = function(){
	alert('window resized');
};

deleteObject - allows you to delete a tracker
E.g.

scrollTracker.addObject('myobject',function(scrollpercent,scrollpos){
	if(scrollpercent > 50) {
		scrollTracker.deleteObject('myobject');
		return;
	}
	var leftpos = scrollpercent/100*960;
	$('#myobject').css('left':leftpos);
})

pagebottom - a useful variable. It's the maximum scroll position (height of the page minus the viewport height).
This may be useful when doing certain calculations.
E.g.

var pagebottom = scrollTracker.pagebottom;
//do something with pagebottom here