jQuery scrolling dynamic content Box

jQuery(document).ready(function($){
$(window).scroll(function() {
var windowHeight = $(window).height();
var documentHeight = $(document).height();
var footerHeight = $(".footer-container").height();
if($(window).scrollTop() >= ($(document).height() - $(window).height() - footerHeight)) {
if($(".news_listing .news_showmore").length == 1){
if($(".news_listing .news_showmore").hasClass("hasloader") == false){
$(".news_listing .news_showmore").addClass("hasloader");
$(".loadmoreimg").show();
/* Write your ajax code here*/
}
}
}
});
});