Adds a GTIN field to the WooCommerce Quick Edit panel, allowing store managers to view and update GTIN values directly from the product list

add-gtin-to-quick-edit.php

/**
 * Add GTIN Field to WooCommerce Quick Edit Panel
 *
 * Allows viewing and editing GTIN from the Quick Edit dropdown.
 */

/**
 * Get the GTIN field label (same as product settings).
 *
 * @return string
 */
function wcs_get_gtin_label() {
	// translators: %1$s GTIN %2$s UPC %3$s EAN %4$s ISBN.
	return sprintf(
		__( '%1$s, %2$s, %3$s, or %4$s', 'woocommerce' ),
		'<abbr title="' . esc_attr__( 'Global Trade Item Number', 'woocommerce' ) . '">' . esc_html__( 'GTIN', 'woocommerce' ) . '</abbr>',
		'<abbr title="' . esc_attr__( 'Universal Product Code', 'woocommerce' ) . '">' . esc_html__( 'UPC', 'woocommerce' ) . '</abbr>',
		'<abbr title="' . esc_attr__( 'European Article Number', 'woocommerce' ) . '">' . esc_html__( 'EAN', 'woocommerce' ) . '</abbr>',
		'<abbr title="' . esc_attr__( 'International Standard Book Number', 'woocommerce' ) . '">' . esc_html__( 'ISBN', 'woocommerce' ) . '</abbr>'
	);
}

// Add hidden GTIN data for Quick Edit JavaScript.
add_action( 'manage_product_posts_custom_column', function( $column_name, $post_id ) {
	if ( 'name' !== $column_name ) {
		return;
	}

	$product = wc_get_product( $post_id );
	if ( ! $product ) {
		return;
	}

	$gtin = $product->get_global_unique_id( 'edit' );
	?>
	<div class="hidden wcs_gtin_inline_data">
		<span class="gtin"><?php echo esc_html( $gtin ); ?></span>
	</div>
	<?php
}, 99, 2 );

// Add GTIN field to Quick Edit form.
add_action( 'woocommerce_product_quick_edit_start', function() {
	?>
	<label class="wcs-gtin-quick-edit">
		<span class="title"><?php echo wp_kses_post( wcs_get_gtin_label() ); ?></span>
		<span class="input-text-wrap">
			<input type="text" name="_global_unique_id" class="text" value="">
		</span>
	</label>
	<br class="clear" />
	<?php
} );

// JavaScript to populate GTIN field when Quick Edit opens.
add_action( 'admin_footer', function() {
	$screen = get_current_screen();
	if ( ! $screen || 'edit-product' !== $screen->id ) {
		return;
	}
	?>
	<script type="text/javascript">
	jQuery(function($) {
		$('#the-list').on('click', '.editinline', function() {
			var $row = $(this).closest('tr');
			var $gtinData = $row.find('.wcs_gtin_inline_data');
			var gtin = $gtinData.length ? $gtinData.find('.gtin').text() : '';
			
			setTimeout(function() {
				$('input[name="_global_unique_id"]', '.inline-edit-row').val(gtin);
			}, 10);
		});
	});
	</script>
	<?php
} );

// Save GTIN from Quick Edit - hook after WooCommerce saves.
add_action( 'woocommerce_product_quick_edit_save', function( $product ) {
	// phpcs:ignore WordPress.Security.NonceVerification.Missing -- Nonce verified by WooCommerce.
	if ( ! isset( $_POST['_global_unique_id'] ) ) {
		return;
	}

	// phpcs:ignore WordPress.Security.NonceVerification.Missing
	$new_gtin = sanitize_text_field( wp_unslash( $_POST['_global_unique_id'] ) );
	$old_gtin = $product->get_global_unique_id( 'edit' );

	// Only update if changed.
	if ( $new_gtin === $old_gtin ) {
		return;
	}

	$post_id = $product->get_id();

	// If empty, allow clearing.
	if ( '' === $new_gtin ) {
		$product->set_global_unique_id( '' );
		$product->save();
		return;
	}

	// Validate uniqueness before setting.
	if ( wc_product_has_global_unique_id( $post_id, $new_gtin ) ) {
		$product->set_global_unique_id( $new_gtin );
		$product->save();
	}
}, 10, 1 );