rogersabboes

This issue has been resolved here: http://wordpress.org/support/topic/423280?replies=8

Actually I want to have a list of categories in the sidebar of my theme. Only those categories should show up in the list which are assigned to the posts shown in the loop.
So lets say I navigate to main page where all posts show up, the category-list would list all categories. When I navigate to a tag-archive (?tag=anything), the category list should only show those categories which are assigned to the posts in this specific tag-archive. And so on..
I use this function for it in the sidebar:

$cat_array = array();
$args=array(
'posts_per_page' => '-1');
$currentposts = new WP_Query($args);
   foreach($currentposts->posts as $currentposts->post) {
    foreach(get_the_category($currentposts->post->ID) as $category) {
      $cat_array[$category->term_id] =  $category->term_id;
    }
  }

$cat_ids = implode(',', $cat_array);
wp_list_categories('include='.$cat_ids.'&title_li=Author Categories&show_count=1');

When I use $currentposts = $wp_query; instead of the new WP_query, everything works perfect, except that global $wp_query onyl considers a maximum of 10 posts, as this is the number i set at the WP reading settings.

Ok I found a solution doing the trick by modifying a function by MichaelH (http://wordpress.org/support/topic/327333?replies=34).

$cat_array = array();
 foreach($posts as $post) {
  foreach(get_the_category($post->ID) as $category) {
    $cat_array[$category->term_id] =  $category->term_id;
  }
}
$cat_ids = implode(',', $cat_array);
wp_list_categories('include='.$cat_ids.'&title_li=Categories in the current loop');

This function shows a list of all categories included in those posts which are currently shown within the loop. When I put it f.i. in my sidebar i can see all the categories from my current query, no matter if I’m on an archive-page, a query-page or on the index-page.

This function works only for categories. How do I change it that it also lists custom taxonomy-tags, and probably also ‘Tag-tags’ and custom field-values which are currently shown in posts from the loop?

Another problem I have with this function is that the list ignores categories which are not listed on the first page. For example when I have an archive-page with 15 posts and the first ten are shown at ?cat=22 and the remaining 5 on ?cat=22&paged=2, I will get 2 different results in the category list, including only those categories which are on the specific page. Is there an option to get always the same list, no matter if the posts are on more than one page?
Thanks a lot!