wc-addons-custom-tax.php

<?php

/**
 *  Additions to the Product Add-on Plugins
 *
 *  Enables us to add a product taxonomy to the 
 *  addon so we can further refine where it 
 *  is displayed
 *
 *
 */





/**
 *      Add the taxonomy product_brand to the 
 *      list of possible ones to look for
 *      when displaying the addon on the front end
 *
 *
 */


add_filter( 'get_product_addons_product_terms', function( $terms, $post_id ) {

    
    //Add Designer terms
    $designers = wp_get_post_terms( $post_id, 'product_brand', array( 'fields' => 'ids' ) );
    
    $terms = array_merge( $terms, $designers );
    
    
    
    return $terms;
    
}, 10, 2 );



/**
 *      Modify the query args for getting the 
 *      addons posts
 *  
 *      We need to change the tax_query to include
 *      the additional taxonomy (product_brand)
 *
 */

add_filter( 'get_product_addons_global_query_args', function( $args, $product_terms ) {


    /*$current_product_id = wc_get_product()->get_id();
        
    if ( ! $current_product_id ) {
        return $args;
    }*/
    
    $cat_terms = [];
    $extra_taxes = [];
    
    foreach( $product_terms as $term_id ) {
        
        $term = get_term( $term_id );
        
        if ( ! is_wp_error( $term ) && ! empty( $term ) && $term->taxonomy !== 'product_cat' ) {
            
            $extra_taxes[ $term->taxonomy ]['taxonomy'] = $term->taxonomy;
            $extra_taxes[ $term->taxonomy ]['terms'][] = $term_id;
            
        } else {
            
            $cat_terms[] = $term_id;
        }
        
    }

    
    //We are organizing the terms into proper tax groups
    
    if ( !empty( $cat_terms ) ) {
        
        $args['tax_query'][0]['terms'] = $cat_terms;
             
    }


    
    
    if( !empty( $extra_taxes ) ) {
     
        //Make our relationship AND because we need to be very specific now that we're using 2 taxonomies
        $args['tax_query']['relation'] = 'AND';
       
        foreach ( $extra_taxes as $extra_tax ) {

            $args['tax_query'][] = [
                'taxonomy'  => $extra_tax['taxonomy'],
                'field'     => 'id',
                'terms'     => $extra_tax['terms'],
                'include_children'  => false
            ];

        }
        
        
    }
    

    
    return $args;
    
}, 10, 2 );












/**
 *      Add pick field for Designers to refine Addon location
 *
 *      This is sort of a hack because you need to use the action 
 *      and close the table row, then create another one.
 */

add_action( 'woocommerce_product_addons_global_edit_objects', function( $objects ) {
    
    //Make sure we're on the edit page
    if( empty( $_GET['edit'] ) ) {
        
        return;
        
    }
    
    $designer_objects = (array) wp_get_post_terms( (int) $_GET['edit'], array( 'product_brand' ), array( 'fields' => 'ids' ) );
    
  
?>
        </select>
        <p class="description"><?php esc_html_e( 'Select which categories this add-on should apply to. Create add-ons for a single product when editing that product.', 'woocommerce-product-addons' ); ?></p>
    </td>
</tr>
<tr class="custom-taxonomy-product-brand">
    <th>
        <label for="addon-objects-product-brand"><?php esc_html_e( 'Designers', 'woocommerce-product-addons' ); ?></label>
    </th>
    <td>
        <select id="addon-objects-product-brand" name="addon-objects-product-brand[]" multiple="multiple" style="width:50%;" data-placeholder="<?php esc_attr_e( 'Choose designers&hellip;', 'woocommerce-product-addons' ); ?>" class="wc-enhanced-select-designers wc-pao-enhanced-select">
        <option value="all_designers" <?php selected( empty( $designer_objects ), true ); ?>><?php esc_html_e( 'All Designers', 'woocommerce-product-addons' ); ?></option>
        <optgroup label="<?php esc_attr_e( 'Designers', 'woocommerce-product-addons' ); ?>">
            <?php
            $terms = get_terms( 'product_brand', array( 'hide_empty' => 0 ) );

            foreach ( $terms as $term ) {
                echo '<option value="' . $term->term_id . '" ' . selected( in_array( $term->term_id, $designer_objects ), true, false ) . '>' . $term->name . '</option>';
            }
            ?>
        </optgroup>
<?php
    
    
}, 10, 1 );





/**
 *      Queue the script for the custom taxonomy selector
 *
 */

add_action( 'admin_enqueue_scripts',  'admin_settings_mdj_addons_enqueue_scripts');

function admin_settings_mdj_addons_enqueue_scripts() {
    
    if (
        'product_page_addons' !== get_current_screen()->id &&
        'product'             !== get_current_screen()->id &&
        'shop_order'          !== get_current_screen()->id &&
        'shop_subscription'   !== get_current_screen()->id
    ) {
        return;
    }
    
    
     wp_enqueue_script( 'wc-addons-custom-tax', get_stylesheet_directory_uri() . '/assets/js/wc-addons.js', array( 'jquery' ), null, true );
        
}






/**
 *      Process saving the Designer
 *
 */

add_action( 'woocommerce_product_addons_global_edit_addons', function( $edit_post, $objects) {
        
    
    //Save our custom taxonomy selector
    $designer_objects = ! empty( $_POST['addon-objects-product-brand'] ) ? array_map( 'absint', $_POST['addon-objects-product-brand'] ) : array();
    
    
    $result = wp_set_post_terms( $edit_post['ID'], $designer_objects, 'product_brand', false );
    
    
}, 10, 2);



/**
 *      Load the Designers on the Addon
 *
 *
 */

add_filter( 'woocommerce_product_addons_global_post_terms', function( $args ) {
    
    $args[] = 'product_brand';
    
    return $args;
    
}, 10 , 1);

wc-addons.js

jQuery( function( $ ) {
    
    $('.custom-taxonomy-product-brand .description').text('Select which designers this add-on should apply to. You must make a selection here or this addon will not show up.');
    
    $( '.wc-enhanced-select-designers' ).select2();
    

    $( '.wc-enhanced-select-designers' ).on( 'select2:select', function( e ) {
        var selectedID = e.params.data.id,
            values     = $( '.wc-enhanced-select-designers' ).val(),
            all        = 'all_designers',
            allIndex   = values.indexOf( all );


        if ( all === selectedID ) {
            //values = [ all ];   
            $('.wc-enhanced-select-designers option' ).prop('selected', 'selected' );
            $('.wc-enhanced-select-designers option[value="all_designers"]' ).removeAttr( 'selected' );
            
            $('.wc-enhanced-select-designers').trigger('change');
        } else if ( 0 === allIndex ) {
            //values.splice( allIndex, 1 );
        }

        //$( '.wc-enhanced-select-designers' ).val( values ).trigger( 'change.select2' );
    } ); 
    
    
} );

Hi,
Can you help me: I don't know how to install (or where to install) the js file.
I use Oxygen Builder so I don't use any theme...
Thank you to help me,
Bruo Bros