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function get_new() {

  // args
  $args = array(
    'post_type' => 'product',
    'showposts' => 100,
    'meta_query' => array(
      array(
        'key' => 'new',
        'value' => '1',
        'compare' => '=='
      )
    )
  );

  // query
  $the_query = new WP_Query( $args );

  if( $the_query->have_posts() ):
    while( $the_query->have_posts() ) : $the_query->the_post();

      if ( has_post_thumbnail()) {
        $post_thumbnail_id = get_post_thumbnail_id( $post );
        $image = '<img src="'. wp_get_attachment_image_url( $post_thumbnail_id, "medium" ) .'" title="'. get_the_title() .'" alt="'. get_the_title() .'" />';
      } else {
        $image = '<img src="'. catchFirstImage() .'" title="'. the_title() .'" alt="'. the_title() .'" />';
      }
      if( get_field('sale') ) {
        $action = '<span class="action upper fira-bold">НА АКЦИИ</span>';
      } else {
        $action = '';
      }

      $output = $output .'<div id="post-'. get_the_ID() .'" class="col-xs-6 col-md-4 nopadding card-product__img card-product__img--cat">
        <a href="'. get_the_permalink() .'">'. $image .'
          '. $action .'
          <span class="num upper fira-bold">'. get_the_title() .'</span>
          <i class="ic ic-loop"></i>
        </a>
        <a href="#" class="like" like-id="'. get_the_ID() .'"><i class="ic ic-like"></i></a>
      </div><!-- end card-product__img -->';
    endwhile;
  endif;

  // Reset Query
  wp_reset_query();
  die($output);
}
add_action('wp_ajax_get_new', 'get_new');
add_action('wp_ajax_nopriv_get_new', 'get_new'); // not really needed

  <script type="text/javascript">
    $(document).ready(function() {

      $(".sidebar-links--new").click(function(e) {
        e.preventDefault();
        var category        = '<?php echo strtolower($category); ?>';
        // var id              = '<?php echo $blogger_id; ?>';
        // var firstname       = '<?php echo $firstname; ?>';
        // var surname         = '<?php echo $surname; ?>';
        // alert(posts + category + id + firstname + surname);
        $.ajax({
            type: "GET",
            url: "http://curtains.dev/wp-admin/admin-ajax.php",
            dataType: 'html',
            data: ({
              action: 'get_new',
              id: 46
              // firstname: firstname,
              // surname: surname,
              // posts: posts,
              // category: category
            }),

            success: function(data){
              $('.card-product__img--cat').hide('fast');
              $('.card-products-cat-wrap').hide().fadeIn('slow').html(data);
              $('.card-products-cat-wrap').append('<div className="clearfix"></div>');
            }
        });

        });
    });
  </script>