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With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly. 
The shortcode is <code>[authorsindex]</code>.
Options are: 
 *ul => the class of you ul element (default = iapAlpha) 
 *li => the class of you li element (default = iapAlpha) 
 *letter => the class of you span element(the letters) (default = iapLetter) 
 *hide_empty => diplay authors that don’t have any article (default = false) 
 *optioncount => display number of post of the author (default = true) 
 *show_fullname => show full name of the author (default = false) 
 *exclude_admin => exclude the admin (default = false) 
 *menu => show a menu of the index (buddypress-like) (default = true) 
 *listpost => display a list of the post of the author in a nice tooltip
<h3>Demonstration</h3>
You can see an example of the functionnality of this plugin at <a href="http://kune.fr/index-des-auteurs/" title="Kune.fr Auteurs Index Page" rel="nofollow ugc">Kune.fr</a>
<h3>Changes</h3>
<ul>
<li>1.1 : Less bugs, one more option to display a list of post of the author in a nice tooltip</li>
<li>1.0 : First release of the plugin</li>
</ul>

Index Authors page

With this plugin, you will be able to display an index with all your authorss, sort alphabeticaly.

Ethan Lin

Display posts, pages, and terms alphabetically in a Rolodex-, catalog-, or directory-style list with the AlphaListing plugin!
This plugin includes a block and shortcode for the list, along with a widget for linking to the list from any location on a site. If a letter has no associated pages, the widget will display the letter unlinked, while the list page will omit the letter entirely.
Show posts from any single or multiple post types, including built-in posts and pages. Post types from plugins like WooCommerce products are also supported. Alternatively, display terms such as categories or tags.
This plugin is based on the original A-Z Listing by Lucy (formerly Dani) Llewellyn, which is no longer maintained. Custom templates built for the original plugin may not work reliably with this version. For the most up-to-date example template, see the <a href="https://raw.githubusercontent.com/Lin87/alphalisting/refs/heads/main/templates/a-z-listing.example.php" rel="nofollow ugc">example template</a>.
<h3>Documentation</h3>
Comprehensive documentation is now available:
<ul>
<li><a href="https://github.com/Lin87/alphalisting/wiki" rel="nofollow ugc">Overview</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/Installation" rel="nofollow ugc">Installation</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/Gutenberg-Block" rel="nofollow ugc">Gutenberg block usage</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/Shortcode-References" rel="nofollow ugc">Shortcode reference</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/PHP-Usage" rel="nofollow ugc">PHP usage</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/Templates-and-Theming" rel="nofollow ugc">Templates and theming</a></li>
<li><a href="https://github.com/Lin87/alphalisting/wiki/FAQs" rel="nofollow ugc">Frequently asked questions</a></li>
</ul>

AlphaListing

Provides an A to Z index page and widget.

Index Authors page vs AlphaListing