CPT Search Form with Taxonomy filter & Or

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I currently use the form below :

<form role="search" method="get" class="search-form" action="<?php echo home_url( "https://wordpress.stackexchange.com/" ); ?>">

        <input type="search" class="search-field" placeholder="<?php echo esc_attr_x( 'Type Business or Town', 'placeholder' ) ?>" value="<?php echo get_search_query() ?>" name="s" title="<?php echo esc_attr_x( 'Search for:', 'label' ) ?>" />

        <input type="text" value="<?php echo get_query_var('location'); ?>" name="location" id="location" class="headersearch location" placeholder="<?php esc_attr_e( 'Enter your county..', 'search-cust' ); ?>" />

        <input type="hidden" name="post_type" value="business" />
        <input type="submit" class="button radius tiny success" style="width: 100%;" value="<?php esc_attr_e( 'Search...', 'search-cust' ); ?>" />
</form>

I also have this in functions.php : 

    function custom_cpt_search( $query ) {
       if ( is_search() && $query->is_main_query() && $query->get( 's' ) ){
            $query->set('post_type', array('business'));
        }
        return $query;
    };
add_filter('pre_get_posts', 'custom_cpt_search');

Ideally id like to have the second input as a drop-down taxonomy list instead of a type-in input, Ideally listing ALL categories in the taxonomy instead of only categories with posts in them. With the first dropdown item being a placeholder such as “Select your county”.

Edited to make clearer, and remove part of the question I have resolved.

2 Answers
2

I think you can do it in two following steps:

  1. In HTML code just add a dropdown with the values you need.

    <select name="yourselect"><option value="1">Value 1</option>

...

</select>

  2. In your pre_get_posts filter add tax_query parameter like this

    if( !empty( $_GET['yourselect'] ) ) {
    $query->set('tax_query', array(
        array(
            'taxonomy' => 'YOUR_TAXONOMY_NAME',
            'field' => 'id', // or slug if you want
            'terms' => $_POST['yourselect']
        )
    );
}

I’m not sure if it is a good idea to configure this way the default WordPress search. A couple months ago I already implemented similar functionality using AJAX filters. Example is here, hope it helps https://rudrastyh.com/wordpress/ajax-post-filters.html

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