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// I've changed the function to display tags based on the CPT
// Like tags_filter('books');
function tags_filter($rel) {
    $tax = 'post_tag';
    //get a list of all post of your type
    $args = array(
        'posts_per_page' => -1,
        'post_type' => $rel
    );
    $terms= array();
    $posts = get_posts($args);
    foreach($posts as $p){
        //get all terms of your taxonomy for each type
        $ts = wp_get_object_terms($p->ID,$tax);
        foreach ( $ts as $t ) {
            if (!in_array($t,$terms)){ //only add this term if its not there yet
                $terms[] = $t;
            }
        }
    }

//when you get here $terms is an array of term objects that have posts of your custom type
    //so just print them out.
    echo '<div class="tag-list">';
    foreach($terms as $tr){
    // Apply the post type based on the link attribute
            echo '<a href="' . get_term_link($tr->slug, $tax) . '" class="tax-filter" tipo="' . $rel . '" title="' . $tr->slug . '">'.$tr->name.'</a>';
    }
    echo '</div>';
    wp_reset_postdata();
}

// Script for getting posts
function ajax_filter_get_posts( $taxonomy, $type ) {

// Verify nonce
  if( !isset( $_POST['afp_nonce'] ) || !wp_verify_nonce( $_POST['afp_nonce'], 'afp_nonce' ) )
    die('Permission denied');

$taxonomy = $_POST['taxonomy'];
  $type = $_POST['type'];

// WP Query
  $args = array(
    'tag' => $taxonomy,
    'post_type' => $type,
    'posts_per_page' => 10,
  );

// If taxonomy is not set, remove key from array and get all posts
  if( !$taxonomy ) {
    unset( $args['tag'] );
  }

$query = new WP_Query( $args );

if ( $query->have_posts() ) : while ( $query->have_posts() ) : $query->the_post(); ?>
 
    <h2><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h2>
    <?php the_excerpt(); ?>
 
  <?php endwhile; ?>
  <?php else: ?>
    <h2>No posts found</h2>
  <?php endif;
 
  die();
}
 
add_action('wp_ajax_filter_posts', 'ajax_filter_get_posts');
add_action('wp_ajax_nopriv_filter_posts', 'ajax_filter_get_posts');

// Here's the javascript function

jQuery(document).ready(function($) {
    $('.tax-filter').click( function() {

// Prevent defualt action - opening tag page
        if (event.preventDefault) {
            event.preventDefault();
        } else {
            event.returnValue = false;
        }

// Get tag slug from title attirbute
        var selected_taxonomy = $(this).attr('title');
        var post_type = $(this).attr('tipo');

$('.tagged-posts').fadeOut();

data = {
                action: 'filter_posts',
                afp_nonce: afp_vars.afp_nonce,
                taxonomy: selected_taxonomy,
                type: post_type,
            };

$.post( afp_vars.afp_ajax_url, data, function(response) {

if( response ) {
                $('.tagged-posts').html( response );
                $('.tagged-posts').fadeIn();
            };
        });
    });
});

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