Craigslist "infinite scroll"

craigslist-scroll.js

function track() {
	var scrollCount = 0;
	var fetching = false;

	return function () {
        if($(window).height() + $(window).scrollTop() >= $('.content').offset().top + $('.content').outerHeight() && !fetching) {
        	scrollCount += 100;
        	fetching = true;
        	$.ajax('http://sfbay.craigslist.org/search/bka' + ( scrollCount > 0 ? '?s='+scrollCount : '' )).then(function(x) {
        	  console.log('going to append elements');
        	  var $stuff = $(x).find('.content .row');
        	  $('.content .row:last').after($stuff);
        	  fetching = false;
        	});
        }
	}
}

$(window).on('scroll', track());

This was an interview question I had for Salesforce a while back and had to look it up.