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WordPress Taxonomy Dropdown Functions
<?php
/**
* Get tools, filtered by the taxonomy term, if one was selected.
*
* @return WP_Query Tools in the taxonomy term if one was selected, else all.
*/
function km_get_tools_in_taxonomy_term() {
return new WP_Query( array(
'post_type' => 'tool', // Change this to the slug of your post type.
'posts_per_page' => 500, // Display a maximum of 500 options in the dropdown.
'tax_query' => km_get_tools_in_taxonomy_term_tax_query(),
) );
}
/**
* Get the taxonomy query to be used by km_get_tools_in_taxonomy_term().
*
* @return array The taxonomy query if a term was selected, else an empty array.
*/
function km_get_tools_in_taxonomy_term_tax_query() {
$selected_term = km_get_selected_taxonomy_dropdown_term();
// If a term has been selected, use that in the taxonomy query.
if ( $selected_term ) {
return array(
array(
'taxonomy' => 'tools', // Change this to the slug of your taxonomy.
'field' => 'term_id',
'terms' => $selected_term,
),
);
}
// Otherwise, don't filter based on a taxonomy term and just get all the results.
return array();
}
/**
* Get the selected taxonomy dropdown term slug.
*
* @return string The selected taxonomy dropdown term ID, else empty string.
*/
function km_get_selected_taxonomy_dropdown_term() {
return isset( $_GET[ 'tools' ] ) && $_GET[ 'tools' ] ? sanitize_text_field( $_GET[ 'tools' ] ) : '';
}
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