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HTML 

              
                <h1>Infinite Scroll - Masonry image grid</h1>

<div class="grid are-images-unloaded">
  <div class="grid__col-sizer"></div>
  <div class="grid__gutter-sizer"></div>
  <div class="grid__item grid__item--height2"></div>
  <div class="grid__item grid__item--width2">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/orange-tree.jpg" alt="orange tree" />
  </div>
  <div class="grid__item grid__item--height3"></div>
  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--height2"></div>
  <div class="grid__item">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/look-out.jpg" alt="look out" />
  </div>

  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--height3"></div>
  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--height3"></div>
  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--width2">
    <img src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/82/raspberries.jpg" alt="rasberries" />
  </div>
  <div class="grid__item grid__item--height2"></div>
  <div class="grid__item grid__item--height2"></div>
  <div class="grid__item grid__item--height3"></div>
  <div class="grid__item grid__item--height1"></div>
  <div class="grid__item grid__item--height2"></div>
</div>

<div class="page-load-status">
  <div class="loader-ellips infinite-scroll-request">
    <span class="loader-ellips__dot"></span>
    <span class="loader-ellips__dot"></span>
    <span class="loader-ellips__dot"></span>
    <span class="loader-ellips__dot"></span>
  </div>
  <p class="infinite-scroll-last">End of content</p>
  <p class="infinite-scroll-error">No more pages to load</p>
</div>
!

CSS 

              
                body {
  font-family: sans-serif;
  line-height: 1.4;
  font-size: 18px;
  padding: 20px;
  max-width: 640px;
  margin: 0 auto;
}

.grid {
  max-width: 1200px;
}

/* reveal grid after images loaded */
.grid.are-images-unloaded {
  opacity: 0;
}

.grid__item,
.grid__col-sizer {
  width: 32%;
}

.grid__gutter-sizer { width: 2%; }

/* hide by default */
.grid.are-images-unloaded .image-grid__item {
  opacity: 0;
}

.grid__item {
  margin-bottom: 20px;
  float: left;
}

.grid__item--height1 { height: 140px; background: #EA0; }
.grid__item--height2 { height: 220px; background: #C25; }
.grid__item--height3 { height: 300px; background: #19F; }

.grid__item--width2 { width: 66%; }

.grid__item img {
  display: block;
  max-width: 100%;
}


.page-load-status {
  display: none; /* hidden by default */
  padding-top: 20px;
  border-top: 1px solid #DDD;
  text-align: center;
  color: #777;
}

/* loader ellips in separate pen CSS */
!

JS 

              
                //-------------------------------------//
// init Masonry

var $grid = $('.grid').masonry({
  itemSelector: 'none', // select none at first
  columnWidth: '.grid__col-sizer',
  gutter: '.grid__gutter-sizer',
  percentPosition: true,
  stagger: 30,
  // nicer reveal transition
  visibleStyle: { transform: 'translateY(0)', opacity: 1 },
  hiddenStyle: { transform: 'translateY(100px)', opacity: 0 },
});

// get Masonry instance
var msnry = $grid.data('masonry');

// initial items reveal
$grid.imagesLoaded( function() {
  $grid.removeClass('are-images-unloaded');
  $grid.masonry( 'option', { itemSelector: '.grid__item' });
  var $items = $grid.find('.grid__item');
  $grid.masonry( 'appended', $items );
});

//-------------------------------------//
// hack CodePen to load pens as pages

var nextPenSlugs = [
  '202252c2f5f192688dada252913ccf13',
  'a308f05af22690139e9a2bc655bfe3ee',
  '6c9ff23039157ee37b3ab982245eef28',
];

function getPenPath() {
  var slug = nextPenSlugs[ this.loadCount ];
  if ( slug ) {
    return '/desandro/debug/' + slug;
  }
}

//-------------------------------------//
// init Infinte Scroll

$grid.infiniteScroll({
  path: getPenPath,
  append: '.grid__item',
  outlayer: msnry,
  status: '.page-load-status',
});
!
999px

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