Josh Harrison

The Yahoo BOSS plugin makes it easy to create a search engine in your WordPress install. Simply activate and configure and you’re off and running. This plugin does not replace the default search within WordPress.
<a href="http://developer.yahoo.com/wsregapp/" rel="nofollow ugc">Yahoo Search BOSS</a> (Build your Own Search Service) allows you to create a search engine using Yahoo technologies via a REST API. Currently, only web content search (images and news coming soon) is supported. You will need to get your own <a href="http://developer.yahoo.com/wsregapp/" rel="nofollow ugc">BOSS application ID</a> to create your search engine. Use of this plugin subjects you to the <a href="http://info.yahoo.com/legal/us/yahoo/search/bosstos/bosstos-2317.html" rel="nofollow ugc">BOSS API Terms of Use</a>. Please read carefully.
In order for your search engine to function correctly, you need to define where you want both the search form and the search results to show. This is done with simple shortcodes that you need to add to a page or pages.
To create the search form add [boss_search_form] to a page.
To define where you want your search results use [boss_search_results]. Nothing will show if a query hasn’t been performed.
The page contents would be the following if you wanted a search form followed by the search results.
[boss_search_form]
[boss_search_results]
Use [pw_search] to combine both shortcodes.
Alternatively, there are numerous template functions available if you prefer to use those over shortcodes.
That is all you need to do to create your custom search engine.
<h3>Administration</h3>
You need to modify a few options for the plugin to work correctly.
Yahoo App ID: add your <a href="http://developer.yahoo.com/wsregapp/" rel="nofollow ugc">Yahoo BOSS application ID</a> here. This option is required.
Results per Page: use to configure how many search results you want to show on each page. Default is 10.
Format: the format of the search results. This would be useful if you want to use with AJAX. Default is XML.
Domains to Search: add site urls here if you want to limit your search to certain sites (one per line).
<h3>Extending</h3>
Yahoo App ID can be overridden with a defined constant in wp-config.
<pre><code>define('YAHOO_APP_ID', 'your_app_id_goes_here');
</code></pre>
There are some filters available to use.
pw_boss_title – applied to the title of the search engine in the search form. Filter function arguments: title.
pw_boss_button – applied to the button to initiate the search in the search form. Filter function arguments: button text.
pw_boss_stylesheet – applied to the search engine stylesheet to provide your own custom stylesheet. Filter function arguments: default stylesheet.
pw_boss_result_info – modify the result meta information (1-10 of 201321 results for WordPress)

Yahoo BOSS

The Yahoo BOSS plugin makes it easy to create a search engine in your WordPress install. This plugin does not replace the default search.

ikad

This plugin uses the Yahoo Suggest API with an abstraction of jQueryUI’s autocomplete widget to show suggestion results for WordPress internal search queries.
It adds an AJAX call to the search form via the WordPress API and provides suggestion feedback as you type. The user can click on the suggestion trends which results in a WordPress search for that query.

WP Yahoo Suggest

Provides suggestions while typing a search query using the Yahoo Suggest API.

Yahoo BOSS vs WP Yahoo Suggest