Every now and then we need to create a list of taxonomies that are not just empty, but are also not found in the posts for that page.
I recently found a pretty sweet solution over on Stack Overflow and wanted to share.
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$my_query = new WP_Query( $my_args ); $post_ids = wp_list_pluck( $my_query->posts, 'ID' ); $my_terms = get_terms( array( 'taxonomy' => 'my-terms', 'hide_empty' => true, 'object_ids' => $post_ids, ) ); |
Thanks to Stack Exchange user MahdiY!
See original here.
In functions.php
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/** * Allow for multiple selects when using wp_dropdown */ add_filter( 'wp_dropdown_cats', 'wp_dropdown_cats_multiple', 10, 2 ); function wp_dropdown_cats_multiple( $output, $r ) { if( isset( $r['multiple'] ) && $r['multiple'] ) { $output = preg_replace( '/^<select/i', '<select multiple', $output ); $output = str_replace( "name='{$r['name']}'", "name='{$r['name']}[]'", $output ); foreach ( array_map( 'trim', explode( ",", $r['selected'] ) ) as $value ) $output = str_replace( "value=\"{$value}\"", "value=\"{$value}\" selected", $output ); } return $output; } |
When using wp_dropdown_categories just add the “multiple” argument:
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$cat_args = array( 'orderby' => 'name', 'id' => 'cat-select', 'name' => 'cats', 'selected' => $_GET['cats']? implode(',', $_GET['cats']):'', 'multiple' => true ); wp_dropdown_categories( $cat_args ); |
On sites where we are using custom post type taxonomies, we often want to have archive page. The problem, is the description field for a taxonomy is a simple textarea field. WE WANT MORE! Here is the code needed to replace the “Description” textarea field with a WYSIWYG field.
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add_action("{$taxonomy}_edit_form_fields", 'add_form_fields_example', 10, 2); function add_form_fields_example($term, $taxonomy){ ?> <tr valign="top"> <th scope="row">Description</th> <td> <?php wp_editor(html_entity_decode($term->description), 'description', array('media_buttons' => false)); ?> <script> jQuery(window).ready(function(){ jQuery('label[for=description]').parent().parent().remove(); }); </script> </td> </tr> <?php } |
This was stolen verbatim from qwerty qwerty over on WordPress StackExchange.
Taxonomies are fantastic, but for some reason there is no built in method for forcing WordPress to select all parent terms of a taxonomy if a user only selects a child / grand-child term. We found a sweet method to force any selected taxonomy to also select all parent taxonomies as well. Thanks to the WordPress Stack Exchange user Sisir for this sweet function.
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//http://wordpress.stackexchange.com/a/100708/57457 add_action( 'save_post', 'jb_force_form_cat_hierarchy', 10, 2 ); function kb_force_form_cat_hierarchy( $post_id, $post ) { $post_type = 'post-type'; // If this isn't a $post_type, don't update it. if($post->post_type != $post_type) return $post_id; $taxonomy = 'my-tax'; // get all assigned terms $terms = wp_get_post_terms($post_id, $taxonomy ); foreach($terms as $term){ while($term->parent != 0 && !has_term( $term->parent, $taxonomy, $post )){ // move upward until we get to 0 level terms wp_set_post_terms($post_id, array($term->parent), $taxonomy, true); $term = get_term($term->parent, $taxonomy); } } } |
Sometimes we do not want our custom taxonomies to have archive pages. Lots of reasons for this, yet there doesn’t seem to be a good solution for this. I would love to see WordPress implement a ‘has_archive’ flag for taxonomies someday. Until then we can use this function to return a 404 for any taxonomy archives we do not want shown to users.
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/** * Disable the taxonomy archive pages */ add_action('pre_get_posts', 'jb_disable_tax_archive'); function jb_disable_tax_archive($qry) { if (is_admin()) return; if (is_tax('tax-slug')){ $qry->set_404(); } } |
I was trying forever to get a good way to allow a user to select from multiple different taxonomies in one ACF drop down. I eventually realized that is just not possible.
Instead, what we need to do is use a select field and populate it dynamically.
To do this, simply create a select field in your ACF. I ended up doing this inside of a repeater, like so:
Now we just need to populate this select field to simulate our taxonomy field. Here is the code for that:
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/** * Populate the link selection of the quick links for use on the dashboard */ add_filter('acf/load_field/key=field_5776bde6e0201', 'jb_populate_select_w_tax'); function jb_populate_select_w_tax($field) { static $list = null; // reset choices $field['choices'] = array(); // return cached list if($list !== null) { return $list; } // initialize choice list $list = array(); // find the categories we want to add $terms = get_terms( array( 'taxonomy' => array('tax-slug-1','tax-slug-2'), 'hide_empty' => false, 'parent' => 0 //we are only getting the top level taxonomies here ) ); if(is_array($terms) && (count($terms) > 0)) { foreach($terms as $term) { $list[$term->term_id] = $term->name; $child_terms = get_terms( array( 'taxonomy' => array('tax-slug-1','tax-slug-2'), 'hide_empty' => false, 'parent' => $term->term_id //now we want this taxonomy's children ) ); if(! empty($child_terms)){ foreach($child_terms as $child_term){ $list[$child_term->term_id] = '- '.$child_term->name; } } } } // set choice list & return updated field $field['choices'] = $list; return $field; } |
There we go! Now you have a select field that allows the user to select between two ( or more ) taxonomies!