Fix critical error and variants tab on licensed variable products (v0.5.8)

- Fixed critical error on frontend product pages for licensed variable products
- Variable product add-to-cart template now passes required variables
- Variants tab no longer disappears when saving attributes
- Added WooCommerce AJAX event listeners for tab visibility

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -7,6 +7,21 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.5.8] - 2026-01-27
+
+### Fixed
+
+- **CRITICAL:** Fixed critical error on frontend product pages for licensed variable products
+- Variable product add-to-cart template now passes required variables (`available_variations`, `attributes`, `selected_attributes`)
+- Variants tab no longer disappears when saving attributes on licensed variable products
+- Added WooCommerce AJAX event listeners to maintain tab visibility during attribute operations
+
+### Changed
+
+- Improved JavaScript event handling for licensed-variable product type in admin
+- Added listeners for `woocommerce_variations_loaded`, `woocommerce_variations_added`, `woocommerce_variations_saved` events
+- Added AJAX complete handler for attribute save operations
+
 ## [0.5.7] - 2026-01-27
 
 ### Changed

src/Product/LicensedProductType.php

@@ -201,19 +201,21 @@ final class LicensedProductType
         </div>
         <script type="text/javascript">
             jQuery(document).ready(function($) {
-                // Show/hide panels based on product type
+                // Show/hide panels based on product type for license settings tab
                 function toggleLicensedProductOptions() {
                     var productType = $('#product-type').val();
                     var isLicensed = productType === 'licensed';
                     var isLicensedVariable = productType === 'licensed-variable';
 
                     if (isLicensed || isLicensedVariable) {
+                        // Show license settings tab
                         $('.show_if_licensed').show();
                         $('.show_if_licensed-variable').show();
                         $('.general_options').show();
                         $('.pricing').show();
                         $('.general_tab').show();
                     } else {
+                        // Hide license settings tab for other product types
                         $('.show_if_licensed').hide();
                         $('.show_if_licensed-variable').hide();
                     }
@@ -334,7 +336,23 @@ final class LicensedProductType
      */
     public function variableAddToCartTemplate(): void
     {
-        wc_get_template('single-product/add-to-cart/variable.php');
+        global $product;
+
+        if (!$product instanceof \WC_Product_Variable) {
+            return;
+        }
+
+        // Get variations count to determine if we should load them via AJAX
+        $getVariations = count($product->get_children()) <= apply_filters('woocommerce_ajax_variation_threshold', 30, $product);
+
+        wc_get_template(
+            'single-product/add-to-cart/variable.php',
+            [
+                'available_variations' => $getVariations ? $product->get_available_variations() : false,
+                'attributes'           => $product->get_variation_attributes(),
+                'selected_attributes'  => $product->get_default_attributes(),
+            ]
+        );
     }
 
     /**
@@ -507,9 +525,13 @@ final class LicensedProductType
                         // Show general and variations tabs
                         $('.general_tab').show();
                         $('.variations_tab').show();
+                        $('.variations_options').show();
 
                         // Hide shipping tab (virtual products)
                         $('.shipping_tab').hide();
+
+                        // Ensure the variations panel can be displayed
+                        $('#variable_product_options').show();
                     }
                 }
 
@@ -518,8 +540,29 @@ final class LicensedProductType
 
                 // On product type change
                 $('#product-type').on('change', function() {
-                    toggleLicensedVariableOptions();
+                    // Use setTimeout to let WooCommerce finish its own processing first
+                    setTimeout(toggleLicensedVariableOptions, 100);
                 });
+
+                // Re-apply after WooCommerce AJAX operations that may reset visibility
+                $(document).on('woocommerce_variations_loaded', toggleLicensedVariableOptions);
+                $(document).on('woocommerce_variations_added', toggleLicensedVariableOptions);
+                $(document).on('woocommerce_variations_saved', toggleLicensedVariableOptions);
+
+                // Handle AJAX complete events for attribute saving
+                $(document).ajaxComplete(function(event, xhr, settings) {
+                    // Check if this was a product data save or attribute action
+                    if (settings.data && (
+                        settings.data.indexOf('action=woocommerce_save_attributes') !== -1 ||
+                        settings.data.indexOf('action=woocommerce_load_variations') !== -1 ||
+                        settings.data.indexOf('action=woocommerce_add_variation') !== -1
+                    )) {
+                        setTimeout(toggleLicensedVariableOptions, 100);
+                    }
+                });
+
+                // Also listen for the WooCommerce product type show/hide trigger
+                $('body').on('woocommerce-product-type-change', toggleLicensedVariableOptions);
             });
         </script>
         <?php

wc-licensed-product.php

@@ -3,7 +3,7 @@
  * Plugin Name: WooCommerce Licensed Product
  * Plugin URI: https://src.bundespruefstelle.ch/magdev/wc-licensed-product
  * Description: WooCommerce plugin to sell software products using license keys with domain-based validation.
- * Version: 0.5.7
+ * Version: 0.5.8
  * Author: Marco Graetsch
  * Author URI: https://src.bundespruefstelle.ch/magdev
  * License: GPL-2.0-or-later
@@ -28,7 +28,7 @@ if (!defined('ABSPATH')) {
 }
 
 // Plugin constants
-define('WC_LICENSED_PRODUCT_VERSION', '0.5.7');
+define('WC_LICENSED_PRODUCT_VERSION', '0.5.8');
 define('WC_LICENSED_PRODUCT_PLUGIN_FILE', __FILE__);
 define('WC_LICENSED_PRODUCT_PLUGIN_DIR', plugin_dir_path(__FILE__));
 define('WC_LICENSED_PRODUCT_PLUGIN_URL', plugin_dir_url(__FILE__));