AJAX file

// AJAX file
$(document).ready(function() {

  // ajax запрос на load more
  let currentPage = 1;
  $('#load-more').on('click', function() {
    currentPage++; // Do currentPage + 1, because we want to load the next page
    $(this).removeData('catslug'); // remove value of data-slug from cache

    $.ajax({
      type: 'POST',
      url: '/wp-admin/admin-ajax.php',
      dataType: 'json',
      data: {
        action: 'load_more_projects',
        paged: currentPage,
        category: $(this).data('catslug'),
      },
      success: function (res) {
        if(currentPage >= res.max) {
          $('#load-more').hide();
        }
        $('.post-filter').append(res.html);
      }
    });
  });

  // ajax запрос на фильтр
  $('.cat-list_item').on('click', function() {
    $('.cat-list_item').removeClass('active');
    $(this).addClass('active');
    $('#load-more').attr('data-catslug', $(this).data('slug')); //write category data to load-more button
    $('#load-more').show(); //Show load more button if hided

    $.ajax({
      type: 'POST',
      url: '/wp-admin/admin-ajax.php',
      dataType: 'json',
      data: {
        action: 'filter_projects',
        category: $(this).data('slug'),
      },
      success: function(res) {
        currentPage = 1; //set the current page to 1 after filter button click
        $('.post-filter').html(res.html);

      }
    })
});