Filter Category Descriptions from modified Elementor Portfolio-Widget with Isotope

jQuery(document).ready(function( $ ){
  
// --- filter ---------------------------------------------------- 

  $('.elementor-portfolio__filter').addClass('filterbutton');
  
var grid = $('.elementor-portfolio__category-description'); // outer box of filterable elements
var item = '.elementor-category__description-item'; // item 
var filteritem = $('.filterbutton'); // filter-button 
var attribute = 'cat-filter'; // what attribute are we searching for?

grid.isotope({
  itemSelector: item,
  filter: 'none',
  layoutMode: 'vertical',
  transitionDuration: 0
});

// filter items on button click
filteritem.click(function() {
  var filterValue = $(this).attr(attribute);
  
  grid.isotope({ filter: filterValue });
  $(item+filterValue).removeClass('initialHidden');
 });
//---- end  
});