dmallon

The Post To Sidebar plugin makes it easy to display post content in the sidebar areas of your site. Once the widget is activated, a multi-select dropdown of all your published pages appears on post editing screens. Select the pages upon which you want the post to be displayed and the post will appear on those pages.
There are options to hide the post title in the output and to show the content as an excerpt.

Post To Sidebar

A WordPress plugin/widget that gives you the ability to put content (posts and custom post types) in your sidebar.

robfelty

This is a very simple plugin that uses Javascript to form a collapsable set of 
links in the sidebar for the pages. Every page corresponding to a given 
parent page will be expanded.
It is largely based off of my Collapsing Pages and Collapsing Pages 
plugins.
<h3>What’s new?</h3>
<ul>
<li>
2.0.3 (2024.01.01)
<ul>
<li>Fixed issue with subsubpages not closing correctly</li>
<li>Got rid of some more warnings</li>
<li>Tested with 6.4.2</li>
</ul>
</li>
<li>
2.0.2 (2023.12.01)
<ul>
<li>Got rid of some warnings</li>
<li>Updated deprecated property __experimentalGroup</li>
<li>Tested with 6.4.1</li>
</ul>
</li>
<li>
2.0.1 (2023.06.16)
<ul>
<li>Bug fixes</li>
</ul>
</li>
<li>
2.0.0 (2023.03.17)
<ul>
<li>Updated to use Gutenberg block</li>
</ul>
</li>
<li>
1.0.1 (2016.05.09)
<ul>
<li>Fixed bug where sometimes setting accordion to false broke javascript</li>
</ul>
</li>
<li>
1.0 (2015.08.12)
<ul>
<li>Compatible with WordPress 4.3</li>
<li>Fixed bug where expanding symbol showed up at lowest depth specified instead 
(thanks to tkibler for pointing it out)</li>
<li>Added option to only display pages of the current subpage</li>
<li>Added option to show top-level page (previously it was always shown)</li>
<li>Added accordion style option</li>
<li>Cleaned up widget settings</li>
<li>improved style management, including the ability to specify style per widget</li>
<li>Switched from unicode symbols to html entities</li>
<li>Not showing tags for title if empty</li>
<li>Fixed bug with title attribute of pages</li>
<li>Totally rewrote javascript</li>
</ul>
</li>
</ul>
<h3>Options</h3>
If using the manual version, you can pass options either as an array, or using 
the query style, just like for other wordpress functions such as 
 wp_list_pages
<pre><code> $defaults=array(
 'title' => __('Pages', 'collapsing-pages'), 
 'sortOrder'=> 'ASC' ,
 'sort'=> 'pageName' ,
 'defaultExpand'=> '',
 'expand' => 0,
 'depth' =>-1,
 'inExcludePage' => 'exclude',
 'linkToPage' => true,
 'inExcludePages' => '',
 'showPosts' => false,
 'animate' => 0,
 'useCookies' => true,
 'postTitleLength' => 0,
 'showTopLevel' => true,
 'currentPageOnly' => false,
 'debug' => false,
 );
</code></pre>
<ul>
<li>inExcludePage
<ul>
<li>Whether to include or exclude certain pages
<ul>
<li>‘exclude’ (default) </li>
<li>‘include’</li>
</ul>
</li>
</ul>
</li>
<li>inExcludePages
<ul>
<li>The pages which should be included or excluded</li>
</ul>
</li>
<li>showPosts
<ul>
<li>Whether or not to include posts as well as pages. Default if false</li>
</ul>
</li>
<li>linkToPage
<ul>
<li>True, clicking on a parent page title will link to that page (default)</li>
<li>False, clicking on a parent page will expand to show sub-pages</li>
</ul>
</li>
<li>sort
<ul>
<li>How to sort the pages. Possible values:
<ul>
<li>‘pageName’ the title of the page (default)</li>
<li>‘pageId’ the Id of the page</li>
<li>‘pageSlug’ the url of the page</li>
<li>‘menuOrder’ custom order specified in the pages settings</li>
</ul>
</li>
</ul>
</li>
<li>sortOrder
<ul>
<li>Whether pages should be sorted in normal or reverse 
order. Possible values:
<ul>
<li>‘ASC’ normal order (a-z 0-9) (default)</li>
<li>‘DESC’ reverse order (z-a 9-0) </li>
</ul>
</li>
</ul>
</li>
<li>expand
<ul>
<li>The symbols to be used to mark expanding and collapsing. Possible values:
<ul>
<li>‘0’ Triangles (default)</li>
<li>‘1’ + –</li>
<li>‘2’ [+] [-]</li>
<li>‘3’ images (you can upload your own if you wish)</li>
<li>‘4’ custom symbols</li>
</ul>
</li>
</ul>
</li>
<li>customExpand
<ul>
<li>If you have selected ‘4’ for the expand option, this character will be 
used to mark expandable link categories</li>
</ul>
</li>
<li>customCollapse
<ul>
<li>If you have selected ‘4’ for the expand option, this character will be 
used to mark collapsible link categories</li>
</ul>
</li>
<li>postTitleLength
<ul>
<li>Truncate post titles to this number of characters (default: 0 = don’t 
truncate)</li>
</ul>
</li>
<li>animate
<ul>
<li>When set to true, collapsing and expanding will be animated</li>
</ul>
</li>
<li>useCookies
<ul>
<li>When true, expanding and collapsing of pages is remembered for each 
visitor. When false, pages are always display collapsed (unless 
explicitly set to auto-expand). Possible values:
<ul>
<li>true (default)</li>
<li>false</li>
</ul>
</li>
</ul>
</li>
<li>showTopLevel
<ul>
<li>True – show top level pages (default)</li>
<li>False – only display sub-pages and below</li>
</ul>
</li>
<li>currentPageOnly
<ul>
<li>True – show only parent and sub pages of the current page</li>
<li>False – show all pages (subject to the include or exclude parameters 
set) (default)</li>
</ul>
</li>
<li>debug
<ul>
<li>When set to true, extra debugging information will be displayed in the 
underlying code of your page (but not visible from the browser). Use 
this option if you are having problems</li>
</ul>
</li>
</ul>
<h4>Examples</h4>
<pre><code>collapsPage('animate=true&sort=ASC&expand=3,inExcludePages=about')
</code></pre>
This will produce a list with: 
* animation on 
* shown in alphabetical order 
* using images to mark collapsing and expanding 
* exclude page about
<h3>Demo</h3>
I use this plugin in my blog at http://blog.robfelty.com
<h3>CAVEAT</h3>
Currently this plugin relies on Javascript to expand and collapse the links. 
If a user’s browser doesn’t support javascript they won’t see the links to the 
posts, but the links to the pages will still work (which is the default 
behavior in wordpress anyways)

Collapsing Pages

This plugin uses Javascript to dynamically expand or collapsable the set of pages for each parent page.

Post To Sidebar vs Collapsing Pages