Ajax from PHP

CFBFeatures.js

var count = 2;
var loader = $('.infinite-loader');

$(window).scroll(function() {

  if($(window).scrollTop() == $(document).height() - $(window).height()) {

    if(count > total) {
      return false;
    } else {
      loadInfiniteContent(count);
    }

    count++;

  }

});

function loadInfiniteContent(pageNumber) {

  loader.fadeIn(500);

  $.ajax({

    url: '/wp-admin/admin-ajax.php',
    type: 'POST',
    data: 'action=infinite_scroll&page_no=' + pageNumber + '&loop_file=loop',
    success: function(html) { 
      loader.fadeOut(500);
      $('#main-content').append(html);
    }

  });

  return false;

}

cfbfeatures.php

function wp_infinitepaginate(){
    $loopFile        = $_POST['loop_file'];
    $paged           = $_POST['page_no'];
    $posts_per_page  = get_option('posts_per_page');

    query_posts(array('paged' => $paged ));
    get_template_part( $loopFile );
    exit;
}