Custom WordPress Search Field with Auto suggestion. It can be used for custom post types.

Nandakrishnan

NK Search 
Simple WordPress Search Form with Auto Suggestions
Use Short-codes to render the search form in your website
[nks] 
[nks post_type=”post-type or post-types separated with comma”] 
[nks post_type=”post-type or post-types separated with comma” class=”custom-class”] 
[nks post_type=”post-type or post-types separated with comma” class=”custom-class” placeholder=”placeholder-text”] 
[nks post_type=”post-type or post-types separated with comma” class=”custom-class” placeholder=”placeholder-text” count=”posts-count”]
It supports 
1. Custom post types 
2. Custom classes 
3. Transients to cache frequent search results

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