isotope/_includes/layout-change.js

      // change layout
      var isHorizontal = false;
      $('#layouts a').click(function(){
        var mode = $(this).attr('href').slice(1);
            wasHorizontal = isHorizontal;
        isHorizontal = $(this).hasClass('horizontal');
  
        if ( wasHorizontal !== isHorizontal ) {
          // need to do some clean up for transitions and sizes
          var style = isHorizontal ? 
            { height: '80%', width: $container.width() } : 
            { width: 'auto' };
          // stop any animation on container height / width
          $container.filter(':animated').stop();

          $container.addClass('no-transition').css( style );
          setTimeout(function(){
            $container.removeClass('no-transition').isotope({ layoutMode : mode });
          }, 100 )
        } else {
          // go ahead and apply new layout
          $container.isotope({ layoutMode : mode });
    
        }
  
        return false;
      });