Sergey.S.Betke

When your blog is loaded, all links of this class .more-link (standard wordpress css class for “Read more…” 
links) are modified to no longer send the user to that post’s 
single page display when clicked. Instead, the WordPress database is queried for that specific post, and all content 
after the <!–more–> tag (i.e. only what you need) is returned. 
The new content is then immediately displayed to the user with light animation (You can disable animation in plugin options), 
inline with the opening content.
<ul>
<li>AJAX-read-more uses the jQuery framework already included with WordPress installations.</li>
<li>This plugin used GET ajax action (not POST, like other plugins), wordpress “template_redirect” action.</li>
<li>It’s compatible with cache plugins (like Hyper Cache Extended).</li>
<li>AJAX-read-more: design of progress indicator and other behaviors – by CSS (example – in css/all.css)</li>
<li>cache-safe script and css url</li>
</ul>
Check plugin options on options page.
Thanks for debugging to den@10-13.ru.
Theme requirements:
<ul>
<li>Your theme must generate correct DOM structure: 
(div id=”#content”) 
… 
(div class=”post”) 
 … 
(/div) 
(/div)</li>
<li>Theme must support footer (wp_footer). If not, you can change corresponding option on plugin option page.</li>
</ul>
For more information, please visit the <a href="http://sergey-s-betke.blogs.novgaro.ru/category/web/wordpress/read-more" rel="nofollow ugc">Sergey S. Betke blog</a>.
<h3>ToDo</h3>
The next version or later: 
* wordpress core integration for cache headers processing??? 
* optional http cache-control max-age header value and must-revalidate 
* just private cache headers, when post has limited access 
* check cache plugins support (Hyper Cache Extended): clear cached responces when post modified 
* cache-control and Last-Modification headers – to separate plugins 
* if-modified http request support (separate plugins) 
* the_excerpt optional support 
* AJAX-read-more send correct http cache-control headers, and fully support client-side public cache. 
* WP 3.3: http://wpdevel.wordpress.com/tag/3-3-dev-notes/ 
* WP 3.3: replace wp_localize_script() with wp_add_script_before(). wp_localize_script doesn’t support non-string params in WP 3.3+ 
* WP 3.3: wp_enqueue_script() now works mid-page – insert scripts just into pages when it’t needed

AJAX Read More

Automatically transform your  links into links that immediately display the rest of your entry (AJAX).

Miguel Useche

This plugin provides a widget and a filter to display a collapsible archive list in your sidebar or posts using the JS JS library.
<h4>Features</h4>
<ol>
<li>Support for Gutenberg blocks. Add it to any FSE theme or Gutenberg compatible theme.</li>
<li>Display a collapsed list of your archives to reduce space.</li>
<li>Uses vanilla JS to add effects and to be compatible with all browsers.</li>
<li>Select your expand/collapse symbol and date format.</li>
<li>Support for archive filters.</li>
<li>Auto expands current/select year from posts.</li>
<li>Select the categories to exclude</li>
<li>Multiple instances support.</li>
<li>Shortcode support [JsArchiveList]</li>
<li>Generates valid HTML code.</li>
<li>Supports multiple languages.</li>
<li>Compatible with most JS cache and minify plugins.</li>
<li>And more to come…</li>
</ol>
<h3>Configuration</h3>
<ul>
<li>Title: title of the widget.</li>
<li>Trigger Symbol: characters to be displayed as bullet.</li>
<li>Effect: Effect to use.</li>
<li>Month Format: month’s display format of the month.</li>
<li>Expand: when to expand the content of the list.</li>
<li>Hide years from before: older years will be hidden under a link. To save space in the page on old sites.</li>
<li>Show days inside month list: group posts by day.</li>
<li>Show number of posts: display how many post are published in the year or in the month.</li>
<li>Show only posts from selected category: show only posts from the selected category when visiting a category page.</li>
<li>Only expand/reduce by clicking the symbol: select if animations start when click the link or just the bullet.</li>
<li>Only expand one at the same time: select if you want to have only one expanded at the same time.</li>
<li>Show posts under months: show post’s title under months.</li>
<li>Show post date next to post title: show post’s date next to post title.</li>
<li>Sort posts by: select how to sort the posts under months.</li>
<li>Include or Exclude categories: Select the categories to include or exclude.</li>
</ul>

JS Archive List

Useful

A JS widget (can be used in posts) for displaying an archive list with some effects.

AJAX Read More vs JS Archive List