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components/cart/actions.ts

@@ -1,7 +1,13 @@
 'use server';
 
 import { TAGS } from 'lib/constants';
-import { addToCart, createCart, getCart, removeFromCart, updateCart } from 'lib/shopify';
+import {
+  addToCart,
+  createCart,
+  getCart,
+  removeFromCart,
+  updateCart,
+} from 'lib/shopify';
 import { revalidateTag } from 'next/cache';
 import { cookies } from 'next/headers';
 
@@ -24,49 +30,62 @@ export async function addItem(prevState: any, selectedVariantId: string) {
   }
 
   try {
-    await addToCart(cartId, [{ merchandiseId: selectedVariantId, quantity: 1 }]);
-    revalidateTag(TAGS.cart)
+    await addToCart(cartId, [
+      { merchandiseId: selectedVariantId, quantity: 1 }
+    ]);
+    revalidateTag(TAGS.cart);
   } catch (e) {
     return 'Error adding item to cart';
   }
-};
+}
 
-export const removeItem = async (lineId: string): Promise<String | undefined> => {
+export async function removeItem(prevState: any, lineId: string) {
   const cartId = cookies().get('cartId')?.value;
 
   if (!cartId) {
     return 'Missing cart ID';
   }
+
   try {
     await removeFromCart(cartId, [lineId]);
+    revalidateTag(TAGS.cart);
   } catch (e) {
     return 'Error removing item from cart';
   }
-};
+}
 
-export const updateItemQuantity = async ({
-  lineId,
-  variantId,
-  quantity
-}: {
+export async function updateItemQuantity(
+  prevState: any,
+  payload: {
     lineId: string;
     variantId: string;
     quantity: number;
-}): Promise<String | undefined> => {
+  }
+) {
   const cartId = cookies().get('cartId')?.value;
 
   if (!cartId) {
     return 'Missing cart ID';
   }
+
+  const { lineId, variantId, quantity } = payload;
+
   try {
+    if (quantity === 0) {
+      await removeFromCart(cartId, [lineId]);
+      revalidateTag(TAGS.cart);
+      return;
+    }
+
     await updateCart(cartId, [
       {
         id: lineId,
         merchandiseId: variantId,
-        quantity
+        quantity,
       }
     ]);
+    revalidateTag(TAGS.cart);
   } catch (e) {
     return 'Error updating item quantity';
   }
-};
+}

components/cart/add-to-cart.tsx

@@ -6,8 +6,8 @@ import { addItem } from 'components/cart/actions';
 import LoadingDots from 'components/loading-dots';
 import { ProductVariant } from 'lib/shopify/types';
 import { useSearchParams } from 'next/navigation';
-// @ts-ignore
 import {
+  // @ts-ignore
   experimental_useFormState as useFormState,
   experimental_useFormStatus as useFormStatus
 } from 'react-dom';
@@ -58,10 +58,10 @@ function SubmitButton({
       })}
     >
       <div className="absolute left-0 ml-4">
-        {!pending ? (
-          <PlusIcon className="h-5" />
-        ) : (
+        {pending ? (
           <LoadingDots className="mb-3 bg-white" />
+        ) : (
+          <PlusIcon className="h-5" />
         )}
       </div>
       Add To Cart

components/cart/delete-item-button.tsx

@@ -1,44 +1,49 @@
-import { XMarkIcon } from '@heroicons/react/24/outline';
-import LoadingDots from 'components/loading-dots';
-import { useRouter } from 'next/navigation';
+'use client';
 
+import { XMarkIcon } from '@heroicons/react/24/outline';
 import clsx from 'clsx';
 import { removeItem } from 'components/cart/actions';
+import LoadingDots from 'components/loading-dots';
 import type { CartItem } from 'lib/shopify/types';
-import { useTransition } from 'react';
+import {
+  // @ts-ignore
+  experimental_useFormState as useFormState,
+  experimental_useFormStatus as useFormStatus
+} from 'react-dom';
 
-export default function DeleteItemButton({ item }: { item: CartItem }) {
-  const router = useRouter();
-  const [isPending, startTransition] = useTransition();
+function SubmitButton() {
+  const { pending } = useFormStatus();
   
   return (
     <button
+      type="submit"
       aria-label="Remove cart item"
-      onClick={() => {
-        startTransition(async () => {
-          const error = await removeItem(item.id);
-
-          if (error) {
-            // Trigger the error boundary in the root error.js
-            throw new Error(error.toString());
-          }
-
-          router.refresh();
-        });
-      }}
-      disabled={isPending}
-      className={clsx(
-        'ease flex h-[17px] w-[17px] items-center justify-center rounded-full bg-neutral-500 transition-all duration-200',
-        {
-          'cursor-not-allowed px-0': isPending
-        }
-      )}
+      aria-disabled={pending}
+      className={clsx('ease flex h-[17px] w-[17px] items-center justify-center rounded-full bg-neutral-500 transition-all duration-200', {
+        'cursor-not-allowed px-0': pending
+      })}
     >
-      {isPending ? (
+      {pending ? (
         <LoadingDots className="bg-white" />
+        
       ) : (
         <XMarkIcon className="hover:text-accent-3 mx-[1px] h-4 w-4 text-white dark:text-black" />        
       )}
     </button>
   );
 }
+
+export function DeleteItemButton({ item }: { item: CartItem }) {
+  const [message, formAction] = useFormState(removeItem, null);
+  const itemId = item.id;  
+  const actionWithVariant = formAction.bind(null, itemId);
+
+  return (
+    <form action={actionWithVariant}>
+      <SubmitButton />
+      <p aria-live="polite" className="sr-only" role="status">
+        {message}
+      </p>
+    </form>
+  );
+}

components/cart/edit-item-quantity-button.tsx

@@ -1,60 +1,66 @@
-import { useRouter } from 'next/navigation';
-import { useTransition } from 'react';
+'use client';
 
 import { MinusIcon, PlusIcon } from '@heroicons/react/24/outline';
 import clsx from 'clsx';
-import { removeItem, updateItemQuantity } from 'components/cart/actions';
+import { updateItemQuantity } from 'components/cart/actions';
 import LoadingDots from 'components/loading-dots';
 import type { CartItem } from 'lib/shopify/types';
+import {
+  // @ts-ignore
+  experimental_useFormState as useFormState,
+  experimental_useFormStatus as useFormStatus,
+} from 'react-dom';
 
-export default function EditItemQuantityButton({
-  item,
-  type
-}: {
-  item: CartItem;
-  type: 'plus' | 'minus';
-}) {
-  const router = useRouter();
-  const [isPending, startTransition] = useTransition();
+function SubmitButton({ type }: { type: 'plus' | 'minus' }) {
+  const { pending } = useFormStatus();
 
   return (
     <button
-      aria-label={type === 'plus' ? 'Increase item quantity' : 'Reduce item quantity'}
-      onClick={() => {
-        startTransition(async () => {
-          const error =
-            type === 'minus' && item.quantity - 1 === 0
-              ? await removeItem(item.id)
-              : await updateItemQuantity({
-                  lineId: item.id,
-                  variantId: item.merchandise.id,
-                  quantity: type === 'plus' ? item.quantity + 1 : item.quantity - 1
-                });
-
-          if (error) {
-            // Trigger the error boundary in the root error.js
-            throw new Error(error.toString());
+      type='submit'
+      aria-label={
+        type === 'plus' ? 'Increase item quantity' : 'Reduce item quantity'
       }
-
-          router.refresh();
-        });
-      }}
-      disabled={isPending}
+      aria-disabled={pending}
       className={clsx(
         'ease flex h-full min-w-[36px] max-w-[36px] flex-none items-center justify-center rounded-full px-2 transition-all duration-200 hover:border-neutral-800 hover:opacity-80',
         {
-          'cursor-not-allowed': isPending,
-          'ml-auto': type === 'minus'
-        }
+          'cursor-not-allowed': pending,
+          'ml-auto': type === 'minus',
+        },
       )}
     >
-      {isPending ? (
-        <LoadingDots className="bg-black dark:bg-white" />
+      {pending ? (
+        <LoadingDots className='bg-black dark:bg-white' />
       ) : type === 'plus' ? (
-        <PlusIcon className="h-4 w-4 dark:text-neutral-500" />
+        <PlusIcon className='h-4 w-4 dark:text-neutral-500' />
       ) : (
-        <MinusIcon className="h-4 w-4 dark:text-neutral-500" />
+        <MinusIcon className='h-4 w-4 dark:text-neutral-500' />
       )}
     </button>
   );
 }
+
+export function EditItemQuantityButton({
+  item,
+  type,
+}: {
+  item: CartItem;
+  type: 'plus' | 'minus';
+}) {
+  const [message, formAction] = useFormState(updateItemQuantity, null);
+  const payload = {
+    lineId: item.id,
+    variantId: item.merchandise.id,
+    quantity: type === 'plus' ? item.quantity + 1 : item.quantity - 1,
+  };
+  const actionWithVariant = formAction.bind(null, payload);
+
+  return (
+    <form action={actionWithVariant}>
+      <SubmitButton type={type} />
+      <p aria-live='polite' className='sr-only' role='status'>
+        {message}
+      </p>
+    </form>
+  );
+}

components/cart/modal.tsx

@@ -10,8 +10,8 @@ import Image from 'next/image';
 import Link from 'next/link';
 import { Fragment, useEffect, useRef, useState } from 'react';
 import CloseCart from './close-cart';
-import DeleteItemButton from './delete-item-button';
-import EditItemQuantityButton from './edit-item-quantity-button';
+import { DeleteItemButton } from './delete-item-button';
+import { EditItemQuantityButton } from './edit-item-quantity-button';
 import OpenCart from './open-cart';
 
 type MerchandiseSearchParams = {