How can I filter by taxonomy on a custom post type’s page?

2 Views

Right now I am outputting the related categories to the current displayed post type as shown below. I am using wp_list_categories to list out the categories and it works just fine. The only issue is that this is being displayed on archive.php and not a single post, so the Taxonomies that are being listed link to their main taxonomy archive.

I would like to link to the taxonomy archive for the current post type ($type) as well as include the query to display that specific taxonomy. Similar to linking to http://example.com?post_type=foo&custom_tax=bar

<? $type = get_post_type(); ?>
                <?php 

                $customPostTaxonomies = get_object_taxonomies($type);

                if(count($customPostTaxonomies) > 0)
                {
                echo '<h3>Browse By:</h3>';
                     foreach($customPostTaxonomies as $tax)
                     {
                         $args = array(
                              'orderby' => 'name',
                              'show_count' => 0,
                              'pad_counts' => 0,
                              'hierarchical' => 1,
                              'taxonomy' => $tax,
                              'title_li' => ''
                            );
                         $woah = get_taxonomy($tax);
                        echo '<ul>';
                        //var_dump($tax);
                        //var_dump($woah);
                        //print_r($woah);
                        echo '<h4>'.$woah->labels->name.'</h4>';
                        echo wp_list_categories( $args );
                        echo '</ul>';
                     }
                }

                ?>`
Post Views: 2

Related posts

1 comment

  1. wp_list_categories uses get_term_link to retrive the terms link.

    This function have a filter that you can use to change what is returned.
    A problem is that you have to pass the current post type to the function that hooks into the filter, but a global variable should works for the scope.

    Of course you have to remove filter after all wp_list_categories calls, for not interfere with nex class of get_term_link.

    So, in your functions.php put:

    function convert_term_link_to_post_type( $termlink, $term, $taxonomy ) {
  global $the_current_type;
  if ( empty($the_current_type) ) return $termlink;
  $link = get_post_type_archive_link( $the_current_type );
  if ( $taxonomy == 'category') $taxonomy = "category_name";
  if ( $link ) return add_query_arg( array($taxonomy => $term->slug), $link );
  return $termlink;
}

    Then change the code you posted like so:

    $type = get_post_type();
$customPostTaxonomies = get_object_taxonomies($type);
if( count($customPostTaxonomies) > 0) {
  echo '<h3>Browse By:</h3>';
  // set the global variable
  global $the_current_type;
  $the_current_type = $type;
  // add the filter that convert the term link
  add_filter('term_link', 'convert_term_link_to_post_type', 20, 3);
  foreach($customPostTaxonomies as $tax) {
    $woah = get_taxonomy($tax);
    $args = array(
      'orderby' => 'name',
      'show_count' => 0,
      'pad_counts' => 0,
      'hierarchical' => 1,
      'taxonomy' => $tax,
      'title_li' => ''
    );
    echo '<ul>';
    echo '<h4>' . $woah->labels->name . '</h4>';
    echo wp_list_categories( $args );
    echo '</ul>';
  }
  // unset the global variable
  unset($the_current_type);
  // remove the filter to not alter any other 'get_term_link' calls
  remove_filter('term_link', 'convert_term_link_to_post_type', 20, 3);
}

Comments are closed.