jchan

This adds Javascript search widgets to any droplists on the website. It allows users to search the contents of the list, and filter out items that do not match. Useful for longs or unsorted lists.
This has been tested on the following browsers: Safari, Firefox 2, Firefox 3, and IE6. There were problems with the appearance of the search textbox on certain browsers in the older version. That should be fixed now.
See http://joshuachan.ca/home/droplist-filter for demonstration.
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Copyright 2008 Joshua Chan
This plugin acts as a wrapper for the Droplist Filter Javascript class, 
which is included with this package in the “droplistFilter” subdirectory. It 
is possible to use that independently from WordPress. See the documentation in 
the subdirectory for more information.
Any graphics images included with this package are for example purposes only 
and are copyright their respective owners.

Droplist Filter

This adds Javascript search widgets to any droplists on the website.

SOGO

Tested with Gutenberg
Create a simple way to add javascript code to individual page post or custom post type header and footer, 
for example: add conversion code to thank you pages 
add google re-marketing code to individual pages 
and much more… 
added in version 1.3 the option to add script \ style to all pages not only individual pages, 
 this will allow you to add Google re-marketing code to the entire site or Google Analytics 
 to use it goto “settings” – “Header Footer Settings”
New Features (version 3.0): 
Added option for terms / category pages
New Features (version 2.3): 
 Added support for WooCommerce shop page.
<ol>
<li>
we support now exclude individual pages form printing the header and footer scripts, this is supported by 2 checkboxes in each page\post 
buy check it the script will not be display on this page
</li>
<li>
we added support to limit the script only for certain post type \ page
</li>
</ol>
if you like it \ use it – please rate us.
usage: 
You need to paste the code with the script tag, for example: 
 you js code

SOGO Add Script to Individual Pages Header Footer

Simple plugin to add script to header and footer for individual pages & posts

Droplist Filter vs SOGO Add Script to Individual Pages Header Footer