Add a custom filter to "The Events Calendar Pro" filter bar plugin based on a taxonomy

tribe_filter-bar_custom_filter

<?php
/**
 * Adding a custom filter
 * A simple copy and paste of the existing Category filter
 * Find this new filter in: WP Admin > Events > Settings > Filterbar
 * Docs for TribeEventsFilter: http://docs.tri.be/Filter-Bar/class-TribeEventsFilter.html
 */
class TribeEventsFilter_CustomClubs extends TribeEventsFilter {
  public $type = 'select';

  public function get_admin_form() {
    $title = $this->get_title_field();
    $type = $this->get_type_field();
    return $title.$type;
  }

  protected function get_type_field() {
    $name = $this->get_admin_field_name('type');
    $field = sprintf( __( 'Type: %s %s', 'tribe-events-filter-view' ),
      sprintf( '<label><input type="radio" name="%s" value="select" %s /> %s</label>',
        $name,
        checked( $this->type, 'select', false ),
        __( 'Dropdown', 'tribe-events-filter-view' )
      ),
      sprintf( '<label><input type="radio" name="%s" value="checkbox" %s /> %s</label>',
        $name,
        checked( $this->type, 'checkbox', false ),
        __( 'Checkboxes', 'tribe-events-filter-view' )
      )
    );
    return '<div class="tribe_events_active_filter_type_options">'.$field.'</div>';
  }

  protected function get_values() {
    $event_clubs = array();
    $event_clubs_term = get_terms( 'uvaclub', array( 'orderby' => 'name', 'order' => 'DESC' ) );
    $event_clubs_by_id = array();
    foreach( $event_clubs_term as $term ) {
      $event_clubs_by_id[$term->term_id] = $term;
    }
    $event_clubs_by_id_reverse = array_reverse( $event_clubs_by_id );
    $parents = array( '0' );
    while ( !empty( $parents ) ) {
      $parents_copy = $parents;
      foreach ( $event_clubs_by_id_reverse as $term ) {
        if ( in_array( $term->parent, $parents_copy ) ) {
          $parents[] = $term->term_id;
          unset( $event_clubs_by_id[$term->term_id] );
          $event_clubs_by_id = TribeEvents::array_insert_after_key( $term->parent, $event_clubs_by_id, array( $term->term_id => $term ) );
        }
      }
      $parents = array_diff( $parents, $parents_copy );
    }
    $child_spacer = '&nbsp;&nbsp;';
    foreach( $event_clubs_by_id as $cat ) {
      $child_depth = 0;
      $parent_id = $cat->parent;
      while ( $parent_id != 0 ) {
        $child_depth++;
        $parent_id = $event_clubs_by_id[$parent_id]->parent;
      }
      $child_indent = str_repeat($child_spacer, $child_depth);
      $event_clubs[] = array(
        'name' => $child_indent . $cat->name,
        'value' => $cat->term_id,
        'data' => array(
          'slug' => $cat->slug,
        ),
      );
    }
    return $event_clubs;
  }

  protected function setup_query_args() {
    $this->queryArgs = array( 'tax_query' => array( array(
      'taxonomy' => 'uvaclub',
      'field' => 'id',
      'terms' => $this->currentValue,
      'include_children' => false,
    ) ) );
  }
 
}
// This adds our new filter to the Filterbar options
// Invokes TribeEventsFilter::__construct($name, $slug);
function CustomClubs_taxfilter(){
  new TribeEventsFilter_CustomClubs('UVaClub', 'uvaclub');
}
add_action('tribe_events_filters_create_filters','CustomClubs_taxfilter');