Extension:OnlineStatusBar

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OnlineStatusBar

Release status: stable

Implementation User activity
Description Adds little bar with icon indicating whether user is online or not on user page.
Author(s) Petr Bena
Latest version 1.0.2 (2011-11-10)
MediaWiki 1.17.0 or higher
Database changes Yes
License GPL
Download
Hooks used
UserLoginComplete

UserLogoutComplete
GetPreferences
ParserGetVariableValueSwitch
ArticleViewHeader
UserGetDefaultOptions
LoadExtensionSchemaUpdates
MagicWordwgVariableIDs
BeforePageDisplay

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OnlineStatusBar adds a little bar to user and talk pages of each user who enabled it, which signalizes whether they are available or not. It also creates the magic word {{ISONLINE}} which may be used on user pages to check the status of a user. It is available in the user preferences.

Installation[edit | edit source]

If your wiki is on a remote server, extract the files to a temporary directory on your local computer, and then upload all of the extracted files to the extensions directory on the server.
  • Download and extract the tarball in your extensions/ folder. It should generate a new folder called OnlineStatusBar directly inside your extensions/ folder.
  • Add the following code at the bottom of your LocalSettings.php:
require_once "$IP/extensions/OnlineStatusBar/OnlineStatusBar.php";
  • Run the following SQL query to create additional tables in your MediaWiki's database:
CREATE TABLE online_status (
`username` VARCHAR(255) NOT NULL DEFAULT '',
`timestamp` CHAR(14) NOT NULL DEFAULT '',
PRIMARY KEY USING HASH (`username`)
) ENGINE=MEMORY;

If you are using SQLite, use this SQL query instead:

CREATE TABLE online_status (
username VARCHAR(255) NOT NULL DEFAULT '',
TIMESTAMP CHAR(14) NOT NULL DEFAULT ''
);
CREATE INDEX username ON online_status (username);
  • Done! Navigate to "Special:Version" on your wiki to verify that the extension is successfully installed.

Configuration[edit | edit source]

You may insert those parameters into LocalSettings.php:

  • $wgOnlineStatusBarDefaultIpUsers - if you want to track also ip users
  • $wgOnlineStatusBarDefaultOnline - default online status
  • $wgOnlineStatusBarDefaultOffline - default offline status
  • $wgOnlineStatusBarDefaultEnabled - if it's enabled for all users as default
  • $wgOnlineStatusBarWriteTime - delay between database write access for update
  • $wgOnlineStatusBar_LogoutTime

Documentation[edit | edit source]

How does it work[edit | edit source]

This extension creates a new table which contains username and last time when user opened some page. Each user has option to enable it in preferences (under Misc heading), all users who do not have it enabled are not affected and do not update this table. When user login or logout it insert / delete the record from table, expired records are frequently removed so that table is very small, users update the table everytime when they read any page so that information whether they are available is updated.

When viewing a user page where enabled it will show the current users availability like so:

ExtensionOnlineStatusBar.png

Caching[edit | edit source]

Extension is using caching in order to access db only when it's necessary, memcached is required for that.

Api[edit | edit source]

New module for api called "onlinestatus" is available, you can display user online status by opening:

api.php?action=query&prop=onlinestatus&onlinestatususer=User

where User is username of user

Performance[edit | edit source]

It reads db everytime when user who has this enabled open any page (cached) in order to find if it's necessary to update timestamp, if timestamp is older than value specified in config, it's updated, thanks to that extension shouldn't write more frequently than once a 5 minutes or so.

Classes[edit | edit source]

It contains 4 classes each in separate file

OnlineStatusBarHooks[edit | edit source]

This class contains the hooks which are used.

ISONLINE[edit | edit source]

Extension also add a magic word {{isonline}} which turns to current status of user, possible states are:

  • online - User in online
  • away / busy - User is away or busy
  • unknown - User doesn't want to be tracked or it's not a user
  • offline - User is offline

Working inside the Foreground Skin[edit | edit source]

To make this extension show up at the right place inside the Foreground skin, the same skin as Wikiapiary, you need to change the following line:

On line 36 of resources/ext.onlinestatusbar.js change:

// Add status bar wrapper
                $( 'h1' ).first().prepend( $statusbarFields );

to

// Add status bar wrapper
                $( 'h2.title' ).first().prepend( $statusbarFields );

Cindy.cicalese, the writer of the Extension:Title Icon, found this fix.

See also[edit | edit source]