TCBarrett

This plugin requires is just the front end javascript library, the following two things to be done in support: 
1. Add the class ‘simpleajaxform’ to your form. 
2. Make sure you have the correct wp_ajax handler hook defined.
It was primarily built as an example for a blog post.

Simple AJAX Form

A simple jQuery javascript library to ajax enable forms.

Bernhard Kau

Kau-Boy’s AutoCompleter is deprecated and will be removed from the plugin directory on June 19, 2023, 14 years after its first release. Thanks to everyone who used the plugin, gave constructive feedback, rated it and send me messages on how it helped them with their sites. This was <a href="https://kau-boys.de/19/allgemein/mein-erster-blog" rel="nofollow ugc">my very first WordPress plugin, and it started my journey into the WordPress community</a>. If you see this message, you are one of few, who still have this plugin installed. But now feel free to remove it from your site. If you still want an auto-completion/suggestion, try out <a href="https://wordpress.org/plugins/wp-search-suggest/" rel="ugc">WP Search Suggest</a>, which is still actively maintained. You can find my other plugins <a href="https://profiles.wordpress.org/kau-boy/#content-plugins" rel="nofollow ugc">on my WordPress profile page</a>.
As you can choose between Prototype and jQuery, you can just take the framework you prefer or use the most. You can also set your own sytles without losing these settings in case the plugin is updated. 
The results are shown right under the search field. The search string is highlighted in the title and/or the content. You can also cutomize the ID of the search field and the number of choices.
A list of all of my plugins can be found on the <a href="http://kau-boys.de/wordpress-plugins?lang=en" title="WordPress Plugins" rel="nofollow ugc">WordPress Plugin page</a> on my blog <a href="http://kau-boys.de" rel="nofollow ugc">kau-boys.de</a>.

Kau-Boy's AutoCompleter

Integrates a google suggest like search to your blog. It Prototype (Scriptaculous) or the jQuery to search for text within the title and/or the conten …

Simple AJAX Form vs Kau-Boy's AutoCompleter