Code-Snippets-Functions/Execute a function on a child site/WooCommerce/disable-backorder-option-product-settings.txt

add_action( 'admin_footer', 'disable_backorder_option_from_product_settings' );
function disable_backorder_option_from_product_settings() {
    global $pagenow, $post_type;

    if( in_array( $pagenow,  array('post-new.php', 'post.php') ) && $post_type === 'product' ) :
    ?>
    <script>
    jQuery(function($){
        // For product variations
        $('#variable_product_options').on('change', function(){
            $('select[name^=variable_backorders]').each( function(){
                $(this).prop('disabled','disabled').val('no');
            });
        });
        // For all other product types
        $('select#_backorders').prop('disabled','disabled').val('no');
    });
    </script>
    <?php
    endif;
}