What is the purpose of this plugin?

This plugin adds a custom Select2 metabox to the Dog post type for selecting dog breeds from the taxonomy.

How does the Select2 feature enhance the metabox?

Select2 provides a searchable select box with lazy loading, making it easier to find and select dog breeds.

How do I add this metabox to my post type?

The plugin automatically adds the metabox to the 'dog' post type in the WordPress admin.

Can I select multiple dog breeds?

Yes, the Select2 metabox allows for multiple selections of dog breeds.

How are the dog breed options populated?

The dog breed options are populated from the 'dog_breeds' taxonomy terms.

What happens to selected breeds upon saving a post?

The selected dog breeds are saved and associated with the post in the 'dog_breeds' taxonomy.

Enhance Dog Post Types with Select2 Dog Breeds Metabox


<?php

/*
Plugin Name: Dog Breeds Metabox with Select2
Description: A metabox using Select2 for Dog post type, with lazy loaded choices from dog_breeds taxonomy.
Version: 1.0
Author: Your Name
*/

function codewp_enqueue_select2() {
    wp_enqueue_style('select2', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/css/select2.min.css');
    wp_enqueue_script('select2', 'https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.13/js/select2.min.js', array('jquery'), '4.0.13', true);
}
add_action( 'admin_enqueue_scripts', 'codewp_enqueue_select2' );

function codewp_dog_breeds_metabox() {
    add_meta_box(
        'dog_breeds_metabox',
        'Dog Breeds',
        'codewp_dog_breeds_metabox_callback',
        'dog',
        'side',
        'default'
    );
}
add_action('add_meta_boxes', 'codewp_dog_breeds_metabox');

function codewp_dog_breeds_metabox_callback($post) {
    wp_nonce_field(basename(__FILE__), 'codewp_nonce');
    $dog_breeds = get_terms('dog_breeds', array('hide_empty' => false));
    $selected_breeds = get_the_terms($post->ID, 'dog_breeds');
    $selected_breeds_ids = ($selected_breeds) ? array_map(function($term) { return $term->term_id; }, $selected_breeds) : array();
    ?>
    <select id="select2-dog-breeds" name="dog_breeds[]" multiple="multiple" style="width: 100%;">
        <?php foreach ($dog_breeds as $breed) : ?>
            <option value="<?php echo $breed->term_id; ?>" <?php echo (in_array($breed->term_id, $selected_breeds_ids)) ? 'selected' : ''; ?>><?php echo $breed->name; ?></option>
        <?php endforeach; ?>
    </select>
    <script type="text/javascript">
        jQuery(document).ready(function($) {
            $('#select2-dog-breeds').select2({
                minimumInputLength: 2,
                matcher: function(params, data) {
                    if ($.trim(params.term) === '') {
                        return data;
                    }
                    if (data.text.toLowerCase().indexOf(params.term.toLowerCase()) > -1) {
                        var modifiedData = $.extend({}, data, true);
                        return modifiedData;
                    }
                    return null;
                }
            });
        });
    </script>
    <?php
}

function codewp_save_dog_breeds_metabox($post_id, $post) {
    if (!isset($_POST['codewp_nonce']) || !wp_verify_nonce($_POST['codewp_nonce'], basename(__FILE__)))
        return $post_id;
    $dog_breeds = (isset($_POST['dog_breeds'])) ? $_POST['dog_breeds'] : array();
    wp_set_object_terms($post_id, $dog_breeds, 'dog_breeds');
}
add_action('save_post', 'codewp_save_dog_breeds_metabox', 10, 2);

function codewp_remove_default_dog_breeds_metabox() {
    remove_meta_box('tagsdiv-dog_breeds', 'dog', 'side');
}
add_action('admin_menu', 'codewp_remove_default_dog_breeds_metabox');
?>

Dog Breeds Select2 Metabox Plugin

Frequently Asked Questions