ngp13

Yes, i have the “SearchWP Live Ajax Search” plugin installed and it returns results without a submit button. In my searchform.php form i have an additional input like this:

<input type="hidden" name="post_type" value="book">

Where “book” is the slug of my Custom Post Type.

You can add a hidden input to your searchform.php (if you have one) to limit the results. Worked for me, without Relevanssi though.

<input type="hidden" name="post_type" value="your-cpt-slug">

Check here in the WP Code Reference