Create custom chat_online_list block for a particular chatroom's chat

I wouldn't recommend using the chat_online_list block for this purpose. It is designed to show who's on-line in the chat on the current page. The reason it doesn't show on other pages is that it's empty, and Drupal doesn't display empty blocks. Instead, create a custom PHP code block, and paste in the code from theme_chatroom_block_chat_online_list(), except for the first four lines, which should be replaced with $chat_id = followed by the ID of the chat whose members you want to show.

I think that it'd be useful such a block.
I've tested this code on 5.x.1-9 but unfortunately it does not work on my site.
Each user can see only its own name in the block, but not the others and block is empty when user is not in the chat.

My directions were incomplete. You need to add
chatroom_block_settings();
to your code.

Equivalent instructions for 4.7:

1. Create a PHP block.
2. Paste in code from chatroom_block_chat_online_list().
3. Replace the first three lines with matches = array([chat ID]);
4. Add chatroom_block_add_state_js();

To get it work on 5.x.1-9 i had to change:

  $users = chatroom_chat_get_online_list($chat_id, $cache_timestamp, 0);

into:

  $users = chatroom_chat_get_online_list($chat_id, $cache_timestamp, 7);

I think that this could lead to the problem that block list contains always the last user that left the chat:
Probably this should be fixed by the ajax calls of chatroom.js, but loading it with the following block code:

  $chat = chatroom_chat_get_from_id($chat_id);
  chatroom_chat_settings($chat);

fails with this javascript error:

a[j] has no properties
e(Object drupal_base=/var/www/example)jquery.js (line 2)
e(Object global=true ifModified=false type=POST timeout=0)jquery.js (line 2)
e("http://www.example.it/modules/chatroom/chatroomread.php", Object drupal_base=/var/www/example, function(), undefined)jquery.js (line 2)
getUpdates()chatroom.js (line 577)
addEvents()chatroom.js (line 48)
e()

This block code fixes the problem with my above bug. Block is updated only when a page is loaded (no ajax) and it lists users that has updated their chat status in the last $offset seconds.

  chatroom_block_settings();
  //List users that has updated their chat status in the last $offset seconds
  $offset=300;
  //Set your chat id;
  $chat_id = 7;
  $title = 'Users in chat';
  $cache_file = _chatroom_get_cache_file("chat.$chat_id");
  $cache_timestamp = @filemtime($cache_file);
  $users =_users_in_chat($chat_id, $cache_timestamp,$offset);
  if (!empty($users)) {
    $content = '';
    $chatname = db_result(db_query("SELECT chatname FROM {chatroom_chat} WHERE ccid = %d", $chat_id));
    $content = '<ul class="menu" id="chatroom-online">';
    foreach ($users as $user) {
      $content .= '<li id="'. $user['guestId'] .'"';
      $content .= $user['away'] ? ' class="chatroom-user-away">' : '>';
      $content .= '<a href="/user/'.$user['uid'].'">'.$user['user'] .'</a></li>';
    }
  $content .= '</ul>';
  print "<h2>".$title."</h2>";
  print $content;
  }

function _users_in_chat($chat_id, $cache_timestamp,$offset) {
  $users = array();
  if ($chat = chatroom_chat_get_from_id($chat_id, FALSE) && !isset($chat->when_archived)) {
    $result = db_query("
      SELECT
        col.uid,
        col.session_id,
        col.guest_id,
        col.away,
        cc.chatname,
        du.name
      FROM {chatroom_online_list} col
      INNER JOIN {chatroom_chat} cc ON cc.ccid = col.ccid
      LEFT JOIN {users} du ON du.uid = col.uid
      WHERE col.ccid = %d AND col.modified > unix_timestamp()-%d", $chat_id,$offset);
    while ($row = db_fetch_object($result)) {
      $name = $row->name ? check_plain($row->name) : _chatroom_variable_get('chatroom_guest_user_prefix', 'guest-') . $row->guest_id;
      $user = array(
        'user' => $name,
        'uid' => $row->uid,
        'guestId' => $row->guest_id,
        'away' => (int) $row->away,
      );
      if ($row->session_id == session_id()) {
        $user['self'] = TRUE;
        $current_user = $user;
      }
      else {
        $users[] = $user;
      }
    }
    if (isset($current_user)) {
      array_unshift($users, $current_user);
    }
  }
  return $users;
}

Thanx for the code.

www.zenxcoder.com