isotope/js/layout-modes/vertical.js

( function( window ) {

'use strict';

function verticalDefinition( LayoutMode ) {

var Vertical = LayoutMode.create( 'vertical', {
  horizontalAlignment: 0
});

Vertical.prototype._resetLayout = function() {
  this.y = 0;
};

Vertical.prototype._getItemLayoutPosition = function( item ) {
  item.getSize();
  var x = ( this.isotope.size.innerWidth - item.size.outerWidth ) *
    this.options.horizontalAlignment;
  var y = this.y;
  this.y += item.size.outerHeight;
  return { x: x, y: y };
};

Vertical.prototype._getContainerSize = function() {
  return { height: this.y };
};

return Vertical;

}

if ( typeof define === 'function' && define.amd ) {
  // AMD
  define( [
      '../layout-mode'
    ],
    verticalDefinition );
} else if ( typeof exports === 'object' ) {
  // CommonJS
  module.exports = verticalDefinition(
    require('../layout-mode')
  );
} else {
  // browser global
  verticalDefinition(
    window.Isotope.LayoutMode
  );
}

})( window );