• [code]
  • [engine]

Although basic emits are great for command output, notifications are more broadly used to alert players to things happening in the game.

What is a Notification?

There are many different kinds of notifications, which each serve a different purpose.


Emits are specific notifications to players on a MU client. They are not sent to the web portal.

Personal Notifications

Personal notifications are persistent alerts targeted to individual characters. They’re saved to the database, so folks won’t miss anything. You can view personal notifications by clicking the ‘bell’ icon on the web portal or using the notices command in-game.

These notifications are associated with a specific kind of object - a mail message or a scene, for example. They are marked as ‘read’ when you view the mail/scene/forum/etc. that it’s notifying you about.

Browser Notifications

Browser alerts are transient messages that appear in the bottom-right corner of the web portal. Depending on the player’s browser and computer settings, they may also appear in the computer’s notification center.

For a player to see these notifications in their computer’s notification center:

  • The browser must support notifications.
  • The player must click 'Accept' or 'Allow' when the game asks them if they want to allow notifications from the game's website. This can be changed later in the browser settings.
  • The game must be set up with HTTPS security.

Game Channel

Low-priority messages are sent to the game announcements channel rather than directly to players. This allows players to mute/leave the channel when they don’t want to be bothered. This channel is named “Game” by default, though individual games can configure which channel is used.

Web Data Updates

Finally, you can send raw data to the web portal to update a page. For example, if someone poses in a scene, the game updates the scene live with the new pose data.

Web data updates are not visible to the player, but rather contain raw data that is parsed and handled by the web portal.

Notification Utilities

There are several notification utilities available in the code.


Emits are sent to a specific player. If you’re in a command handler, you might already have a client or room reference:

client.emit message message

Otherwise you can find a character by name and then notify them with this utility:

Login.emit_if_logged_in(char, message)

Emit + Browser Notification

Commonly you’ll want to notify BOTH characters on the web portal and those on a MU client. The global notifier class can help.

To notify all characters, you would do:

    Global.notifier.notify_ooc(:shutdown, message) do |char|

You can put conditions into the block to limit the notification to only certain characters. Here the notification is limited to those characters who can read a forum category:

  Global.notifier.notify_ooc(type, message) do |char|
    char & Forum.can_read_category?(char, category)

Personal Notifications

You can create a personal notification (aka login notice) for a character using this utility:

Login.notify(recipient, :mail, message,

The type (:mail) and the reference ID ( help the portal direct the player to the proper page to read the item.

Ideally, you will mark notifications as read when they’re no longer relevant. For example, you’d mark the mail notification as read once they’ve read the mail message.

Login.mark_notices_read(message.character, :mail,

Use the same type (:mail) and reference ID ( that you used when creating the notification.

Web Data Notification

Web data notifications are used to update info on the web portal without emitting to the game, like adding a pose to a scene or a chat message to a channel.

As with the global notifier, we can limit the notification to only certain characters. Here we’re only sending it to characters on a channel:

  web_message = "#{}|#{}|#{Website.format_markdown_for_html(formatted_msg)}"
  Global.client_monitor.notify_web_clients(:new_chat, web_message) do |char|
    char && Channels.is_on_channel?(char, channel)

Notice that we’re sending a bunch of data here (separated by pipe delimiters). Web client notifications contain data and not just a simple message for display. The type (:new_chat) tells the web portal how to interpret the data.

Game Channel

General game events are sent to the Game channel by default (though you can configure which channel). This includes miscellaneous updates like the who record being broken, and event starting, and so on. Using a channel versus a global emit lets people mute these notifications when they’re RPing and catch up on them later.