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.

Konstantin Obenland

This plugin lets you provide the user with search suggestions based on the information entered in the search field.
It adds an AJAX call to the search form, returning matches for the current search query from the database. 
There is no change of template files necessary as this plugin hooks in the existing WordPress API to unfold its magic.
<h4>Translations</h4>
I will be more than happy to update the plugin with new locales, as soon as I receive them! 
Currently available in:
<ul>
<li>English</li>
<li>Deutsch</li>
<li>Czech</li>
</ul>
<h3>Filter Reference</h3>
wpss_search_query_args (array|string)
<blockquote>
The query args, passed to <a href="https://codex.wordpress.org/Function_Reference/WP_Query" title="WP_Query in the WordPress Codex" rel="nofollow ugc">WP_Query</a>, either as an array or a string. 
 An array with the default query args and the current search query are passed to the filter.
</blockquote>
wpss_search_results (array)
<blockquote>
An array with the result strings as values. An array with the default results and the WP_Query object are passed to the filter.
</blockquote>

WP Search Suggest

С плагином интернет-магазина WP Shop работает отлично.

Чтобы саджест-поиск не искал в ненужных типах записей в файл functions.php достаточно включить функцию-фильтр, в которой настроить WP Search Suggest под себя:


    `/*
    * Customize plugin WP Search Suggest
    */
    function wp_search_suggest_custom($query_args) {

        $query_args += [
            'post_type' => ['post', 'page'],
            'posts_per_page' => 10,
        ];

        return $query_args;
    }
    add_filter( 'wpss_search_query_args', 'wp_search_suggest_custom');`

Отличный плагин для поиска по товарам с подсказками

I like this simple Plugin, I only would wish to have more results or to set an option for this ;)

Simple is the Best!

Great and clean plugin!

Provides title suggestions while typing a search query, using the built-in jQuery suggest script.

Simple AJAX Form vs WP Search Suggest