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Discussion Plugin

Compatible with DokuWiki

  • 2022-07-31 "Igor" unknown
  • 2020-07-29 "Hogfather" yes
  • 2018-04-22 "Greebo" yes
  • 2017-02-19 "Frusterick Manners" yes

plugin Adds a comments section to Wiki pages. (previous authors: Esther Brunner)

Last updated on
Syntax, Helper, Admin, Action
Conflicts with
sidebar, struct

Similar to blogtng, disqus, guestbook, miniblog, talkpage

Tagged with discussion

Needed for feed, tiledblog


The Discussion Plugin adds a discussion section after your wiki page for user comments. This is useful to separate page content and the discussion thereof and also, if you don't want to give normal users the right to edit the page but still want user contributed notes.

A second component of this plugin shows a list of all pages in a namespace with a discussion section (called discussion threads) ordered by most recent comments. This allows you to create a very simple discussion forum in your wiki.



This is the main part of the plugin. By including the ~~DISCUSSION~~ instruction in your wiki page, a discussion section will be appended after the normal wiki page content. To turn it off again, use ~~DISCUSSION:off~~. If you want to show the existing discussion but don't want to allow new comments / replies, use ~~DISCUSSION:closed~~.


A custom title can be appended after the separator |.

~~DISCUSSION|Custom Title String~~
~~DISCUSSION:closed|Custom Title String~~

After each comment in the discussion section there may be up to three buttons (depending on your rights):

  • Reply: To reply to a comment (vs. commenting on the wiki page content), click the Reply button. The comment entry form will then be placed accordingly.
  • Edit: Registered users can edit their comments; admins can edit all comments. To remove a comment, just edit it, clear the text and save the empty comment – like you would do with a wiki page.
  • Delete: Registered users and admin all comments.
    Attention: If there are replies to a comment, removing it will also remove all replies!
  • Hide / Show: Admins can deactivate and reactivate comments easily by this button. Hidden comments aren't shown to normal users and are displayed dimmed to admins. Registered users can only hide their own comments.

Of course, the whole DokuWiki syntax can be used in comments as well. But there are problems with headers and footnotes as they may produce conflicting IDs and thus invalid XHTML. I'm looking for a way to either allow only a subset of the wiki syntax or automatically create unique IDs.

Threads syntax

This displays a list of all pages of the given namespace with a discussion section. The list is sorted by the most recent comment.

[namespace] the namespace for which you want a discussion thread list; : is the top namespace, . is the same namespace as the page lies in, * the whole wiki required
[count=n] the number of discussions which should be displayed (valid values: n > 0) optional
[flags] pagelist flags delimited by &, see flags optional
skipempty Do not print discussions with no comments optional
nonewthreadform Do not show the new thread form form below the table optional

Default a new thread form is shown below the list. See threads_formposition setting for moving it to the top of the list, or to disable this form.


The plugin can be configured using DokuWiki's configuration manager available in the admin menu.

automatic automatically enables discussions on all pages
excluded_ns list of namespaces for which to revert the automatic config setting (a regular expression e.g. /(playground|wiki)/ )
visibilityButton Enable button for toggling the visibility of the discussion section
allowguests allow/disallow unregistered users to leave comments
showguests show/hide comments to unregistered users
linkmail link username with the supplied mail address
useavatar display avatars (requires the Avatar plugin)
urlfield allow to submit a homepage URL (will be linked with the name unless linkmail is set)
addressfield allow to submit a address
adminimport admin can supply all fields (for import only)
wikisyntaxok allow wiki syntax in comments1)
threads_formposition position of the new thread form shown with the {{threads> }} syntax (before or below the thread listing)
subscribe allow comment subscription (uses double opt-in)
newestfirst Invert the comments display order
usethreading enable/disable threaded comments
userealname display the real name instead of the user name of registered wiki users
moderate moderate new comments
moderatorgroups add groups to delegate administrative control (e. g. @coadmins,@mods)
moderatorsnotify send a notification to all specified moderators whenever a new comment was submitted

Bugs / Feature Requests

Please report bugs or feature requests at the Bug tracker.


  • 2013-10-29:
    • Use the current mailer API of DokuWiki, this fixes problems with PHP installations with disabled /e modifier. This makes the plugin incompatible with DokuWiki versions older than Adora Belle (2012-09-10)
    • Fix the unsubscribe link in notification mails for logged in users
    • Re-implemented the enable/disable handling, comments are disabled automatically now when the discussion syntax is removed and automatic discussions are disabled.
    • Translation updates
  • 2013-07-01: Fix the captcha check for logged-in users
  • 2013-06-18:
    • Make the discussion plugin compatible with current versions of the Captcha plugin
    • Add the option to specify separate moderator groups for comments
    • Use jQuery instead of the old JavaScript library, this makes the plugin compatible with DokuWiki version Weatherwax
  • 2013-02-15: Security fix (XSS vulnerability), if you are using an older version of the discussion plugin you should upgrade ASAP! :!:


How do I allow plugin formatting within discussions?

I have DokuWiki formatting allowed in comments. I also have a LaTeX plugin. <math>\sum_x{x+5}</math> is not rendered within a discussion.

How do I prevent SPAM?

The plugin has built-in support for the CAPTCHA plugin. Additionally, one might also consider to use the Bad Behavior plugin.

My dates are shown wrong. What can I do?

You're probably not running the latest version of the plugin. Try to update to the latest version first.

Is it possible to show the newest entry on top?

Yes, use the newestfirst config option.

Can admins subscribe to all discussions?

If you enable the notify option admins are notified for all comments.

Where are discussions saved?

The comments are saved in special meta files inside the <dokuwiki>/data/meta directory. Each page which has a discussion has a corresponding pagename.comments file.

How can I change the discussion box size?

You can change the size of the box by using the following CSS class:

div.dokuwiki div.comment_wrapper {}

Why do comments not appear in the latest changes list?

Because it would break DokuWiki's revisions system.

Alternative: use the pagelist plugin to make an overview of “latest discussion” by using the {{threads>...}} syntax.

When I use the sidebar plugin the discussions disappear

This is a know problem with the sidebar plugin which needs to be fixed by it's author. If you're looking for working alternatives in the meanwhile I suggest to have a look at the SidebarNG plugin.

Is it somehow possible to show all discussions on one page (like in the admin area)?

You can list all discussions with:


Beware that hidden comments are not shown. Not even to administrators.

This example


shows a list of pages inside namespace_abc with

  • all pages which have comments, skipping the empty ones caused by e.g. deletion.
  • columns Page including a link to the page, Date and Number of comments which is also a link to the comments section of the page. The usual User column is omitted as indicated by nouser.
  • headers for each column.
  • no new thread form below the list.

I can add tags to a discussion, but they don't seem to end up in the tag cloud, or being noticed by the tag plugin

Discussions aren't stored like regular wiki pages. This will not work.

How can I subscribe to a RSS feed of all discussions or threads

This is possible using the feed plugin, please see there how it works.

No subscribe/unsubscribe to comments for logged-in users

The plugin disables subscription for logged-in users when the option “subscribers” ($conf['subscribers']) is activated in the configuration.

Removing the shown IP of a guest comment and replacing it with 'Guest: name'

You will need to edit a line in the 'action.php' file which can be found in lib→plugins. Find the following line (281)

$comment['user']['id'] = 'test'.hsc($_REQUEST['user']);

and replace it with

$comment['user']['id'] = 'GUEST: '.hsc($_REQUEST['name']);

Is it possible to disable the email box for guest comments?

I'm not a developer of the plugin but I believe you can do this if you comment out the following lines 283-287 and 291:

	// if(empty($_REQUEST['name']) or empty($_REQUEST['mail'])) return;
	// if(!mail_isvalid($_REQUEST['mail'])) {
		// msg($lang['regbadmail'], -1);
		// return;
	// } else {
		$comment['user']['id'] = 'test'.hsc($_REQUEST['user']);
		$comment['user']['name'] = hsc($_REQUEST['name']);
		$comment['user']['mail'] = hsc($_REQUEST['mail']);
	// }                  

and lines 983 - 988:

              <!--<div class="comment_mail">
                <label class="block" for="discussion__comment_mail">
                   <span><?php echo $lang['email'] ?>:</span>
                      <input type="text" class="edit<?php if($_REQUEST['comment'] == 'add' && empty($_REQUEST['mail'])) echo ' error'?>" name="mail" id="discussion__comment_mail" size="50" tabindex="2" value="<?php echo hsc($_REQUEST['mail'])?>" />

in action.php inside the plugins directory. Anonymous users won't be able to subscribe tho. Please correct me if I'm breaking some other function with this. Until now there hasn't been a problem tho. Andy

When I add a ~~DISCUSSION~~ to a page the toolbar for the editor for the main page text changes to the one for the discussion submission box with buttons like that for media removed. Is this expected behaviour?

I've detailed this issue but am unable to work around the problem that, with my wiki, I can't insert media on pages that also have discussions as the main page edit toolbar is replaced with the reduced toolbar for the discussions.

Issues and feature requests

Please report any bugs or feature wishes in the issue tracker!

  • Please don't simply add other plugins as conflicts without explaining which part is broken either by reporting an issue (preferred) or explaining it on the discussion page.
  • You can add and improve translations at


For the discussion refer to the discussion page.

Uncheck this parameter to avoid problems with the Struct plugin
plugin/discussion.txt · Last modified: 2022-07-27 10:52 by

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