Get and display the selected variation SKU in WooCommerce

Question

I have this code that works for simple product type but not for variable products in WooCommerce:

add_shortcode( 'product_sku_div', 'wc_product_sku_div'); 
function wc_product_sku_div() { 
    global $product;

    return sprintf( '<div class="widget" sp-sku="%s"></div>', $product->get_sku() );
}

How can I make it work for both simple and variable products?

Answer 1

To make it work also for variable products and their variations, it requires Javascript (jQuery) to get the selected variation SKU for variable products.

Try the following that works for simple an variable product types, displaying the selected variation SKU for variable products:

add_shortcode( 'product_sku_div', 'wc_product_sku_div');
function wc_product_sku_div() {
    global $product;

    if( ! is_a('WC_Product', $product) ) {
        $product = wc_get_product( get_the_id() );
    }

    ## 1 - For variable products (and their variations)
    if( $product->is_type('variable') ) {
        ob_start(); // Starting buffering

        ?>
        <div class="widget" sp-sku=""></div>
        <script type="text/javascript">
        jQuery( function($){
            $('form.variations_form').on('show_variation', function( event, data ){
                $( 'div.widget' ).attr( 'sp-sku', data.sku );
                // For testing
                console.log( 'Variation Id: ' + data.variation_id + ' | Sku: ' + data.sku );
            });
            $('form.variations_form').on('hide_variation', function(){
                $( 'div.widget' ).attr( 'sp-sku', '' );
            });
        });
        </script><?php

        return ob_get_clean(); // return the buffered content
    }
    ## 2 - For other products types
    else {
        return sprintf( '<div class="widget" sp-sku="%s"></div>', $product->get_sku() );
    }
}

Code goes in functions.php file of your active child theme (or active theme). Tested and work.