ajax filter

NO changes in js filter

// functions.php


function filter_projects() {
  $catSlug = $_POST['category'];


  $args = array(
    'post_type' => 'project',
    'tax_query' => array(
        array(
            'taxonomy' => 'project-type',
            'field'    => 'slug',
            'terms'    => $catSlug,
        ),
    ),
);
$ajaxposts = new WP_Query( $args );

  $response = '';

  if($ajaxposts->have_posts()) {
    while($ajaxposts->have_posts()) : $ajaxposts->the_post();
      $response .= get_template_part('template-parts/project');
    endwhile;
  } else {
    $response = 'No projects';
  }

  echo $response;
  exit;
}
add_action('wp_ajax_filter_projects', 'filter_projects');
add_action('wp_ajax_nopriv_filter_projects', 'filter_projects');





// page-portfolio.php  -- main content

<?php $categories = get_terms( [
    'taxonomy' => 'project-type',
    'hide_empty' => false,
  ] ); ?>

  <div class="portfolio__filter">
    <li><a class="cat-list_item current-menu-item" href="/portfolio" data-slug="">All projects</a></li>
    <?php foreach($categories as $category) : ?>
      <li>
        <a class="cat-list_item" href="#!" data-slug="<?= $category->slug; ?>">
          <?= $category->name; ?>
        </a>
      </li>
    <?php endforeach; ?>
  </div>

  <?php
    $projects = new WP_Query([
      'post_type' => 'project',
      'posts_per_page' => -1,
      'order_by' => 'date',
      'order' => 'desc',
      ]);
  ?>

  <?php if($projects->have_posts()): ?>
    <div class="portfolio__content">
      <?php
        while($projects->have_posts()) : $projects->the_post();
        get_template_part('template-parts/project');
        endwhile;
      ?>
    </div>
  <?php wp_reset_postdata(); ?>
  <?php endif; ?>