fix(storefront): STRF-12475 Use utils.api.cart.postFormData when upda…

…ting variants in cart

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Bump other GH actions to fix warnings related to old versions [#2495](https://github.com/bigcommerce/cornerstone/pull/2495)
 - Add a section to display the payment promotion widget in the drop-down of the cart preview [#2523](https://github.com/bigcommerce/cornerstone/pull/2523)
 - Add support Node 20 [#2519](https://github.com/bigcommerce/cornerstone/pull/2519)
+- Use fetch when updating variants in cart ([#2521](https://github.com/bigcommerce/cornerstone/pull/2521))
 
 ## 6.15.0 (10-18-2024)
 - Cornerstone changes to support inc/ex tax price lists on PDP [#2486](https://github.com/bigcommerce/cornerstone/pull/2486)

assets/js/theme/cart.js

@@ -151,6 +151,18 @@ export default class Cart extends PageManager {
                 this.$modal.one(ModalEvents.opened, optionChangeHandler);
             }
 
+            const modalForm = this.$modal.find('form');
+            const refreshContent = () => this.refreshContent();
+            async function onSubmit(event) {
+                event.preventDefault();
+                utils.api.cart.postFormData(new FormData(this), () => {
+                    modal.close();
+                    refreshContent();
+                });
+            }
+
+            modalForm.on('submit', onSubmit);
+
             this.productDetails = new CartItemDetails(this.$modal, context);
 
             this.bindGiftWrappingForm();

package.json

@@ -6,7 +6,7 @@
   "author": "BigCommerce",
   "license": "MIT",
   "dependencies": {
-    "@bigcommerce/stencil-utils": "6.18.0",
+    "@bigcommerce/stencil-utils": "6.19.0",
     "core-js": "^3.9.0",
     "creditcards": "^4.2.0",
     "easyzoom": "^2.5.3",