Profile: Tai Chang

/**
 * No initial results until a filter has been applied
 * Tests for one specific custom field search filter
 * Reference: https://toolset.com/forums/topic/how-to-disable-the-search-in-view-using-blank/
 */
function tssupp_no_initial_results( $query_results, $view_settings, $view_id ){
 
  $target_views = array( 123, 456 );
  $field_slug = 'field-slug';
 
  // you should not edit below this line
 
  if ( in_array( $view_id, $target_views ) ) {
    // blank search indicates just blank space in the filter
    $blank_search = isset($query_results->query['meta_query']) && sizeof($query_results->query['meta_query']) == 2 && $query_results->query['meta_query'][0]['key'] == 'wpcf-'.$field_slug && trim($query_results->query['meta_query'][0]['value']) == '';
    // if there is no search term set, drop all results
    if ( !isset( $query_results->query['meta_query'] ) || $blank_search ) {
      $query_results->posts = array();
      $query_results->post_count = 0;
      $query_results->found_posts = 0;
    }
  }
 
  return $query_results;
}
add_filter( 'wpv_filter_query_post_process', 'tssupp_no_initial_results', 10, 3 );