This article on WP Beginner covering how to add custom post type selections into an advanced search form. Fearless Flyer writes an article covering searching a custom post type with specific taxonomy terms applied to it via dropdown menu selects. A full on thread on WordPress Stack Exchange covering advanced search across multiple post types Full Article…
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WordPress select menu navigation for mobile sites
The first option is to follow both of these untried tutorials: http://www.xldstudios.com/generating-select-menu-in-wordpress/ http://www.xldstudios.com/javascript-snippet-go-to-site-selected-in-drop-down-menu/ The second option is to try this amazing plugin. http://wordpress.org/extend/plugins/dropdown-menus/