<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.2/jquery.min.js" type="text/javascript"></script>
<script src="javascript/jquery.gridly.js" type="text/javascript"></script>
<link href="stylesheets/jquery.gridly.css" rel="stylesheet" type="text/css" />

npm install -g bower
bower install gridly

+ source 'https://rails-assets.org'
...
+ gem 'rails-assets-gridly'

/*
 ...
 *= require gridly
 ...
*/

//= require jquery
...
//= require gridly

<style>
  .brick.small {
    width: 140px;
    height: 140px;
  }

  .brick.large {
    width: 300px;
    height: 300px;
  }
</style>

<div class="gridly">
  <div class="brick small"></div>
  <div class="brick small"></div>
  <div class="brick large"></div>
  <div class="brick small"></div>
  <div class="brick small"></div>
  <div class="brick large"></div>
</div>

<script>
  $('.gridly').gridly();
</script>

$('.gridly').gridly({
  base: 60, // px 
  gutter: 20, // px
  columns: 12
});

var reordering = function($elements) {
  // Called before the drag and drop starts with the elements in their starting position.
};

var reordered = function($elements) {
  // Called after the drag and drop ends with the elements in their ending position.
};

$('.gridly').gridly({
  callbacks: { reordering: reordering , reordered: reordered }
});


$('.gridly').gridly('draggable', 'off'); // disables dragging
$('.gridly').gridly('draggable', 'on);  // enables dragging