cart handles quantity rules

examples/b2b/app/components/Cart.tsx

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+import {CartForm, Image, Money} from '@shopify/hydrogen';
+import type {CartLineUpdateInput} from '@shopify/hydrogen/storefront-api-types';
+import {Link} from '@remix-run/react';
+import type {CartApiQueryFragment} from 'storefrontapi.generated';
+import {useVariantUrl} from '~/lib/variants';
+
+type CartLine = CartApiQueryFragment['lines']['nodes'][0];
+
+type CartMainProps = {
+  cart: CartApiQueryFragment | null;
+  layout: 'page' | 'aside';
+};
+
+export function CartMain({layout, cart}: CartMainProps) {
+  const linesCount = Boolean(cart?.lines?.nodes?.length || 0);
+  const withDiscount =
+    cart &&
+    Boolean(cart?.discountCodes?.filter((code) => code.applicable)?.length);
+  const className = `cart-main ${withDiscount ? 'with-discount' : ''}`;
+
+  return (
+    <div className={className}>
+      <CartEmpty hidden={linesCount} layout={layout} />
+      <CartDetails cart={cart} layout={layout} />
+    </div>
+  );
+}
+
+function CartDetails({layout, cart}: CartMainProps) {
+  const cartHasItems = !!cart && cart.totalQuantity > 0;
+
+  return (
+    <div className="cart-details">
+      <CartLines lines={cart?.lines} layout={layout} />
+      {cartHasItems && (
+        <CartSummary cost={cart.cost} layout={layout}>
+          <CartDiscounts discountCodes={cart.discountCodes} />
+          <CartCheckoutActions checkoutUrl={cart.checkoutUrl} />
+        </CartSummary>
+      )}
+    </div>
+  );
+}
+
+function CartLines({
+  lines,
+  layout,
+}: {
+  layout: CartMainProps['layout'];
+  lines: CartApiQueryFragment['lines'] | undefined;
+}) {
+  if (!lines) return null;
+
+  return (
+    <div aria-labelledby="cart-lines">
+      <ul>
+        {lines.nodes.map((line) => (
+          <CartLineItem key={line.id} line={line} layout={layout} />
+        ))}
+      </ul>
+    </div>
+  );
+}
+
+function CartLineItem({
+  layout,
+  line,
+}: {
+  layout: CartMainProps['layout'];
+  line: CartLine;
+}) {
+  const {id, merchandise} = line;
+  const {product, title, image, selectedOptions} = merchandise;
+  const lineItemUrl = useVariantUrl(product.handle, selectedOptions);
+
+  return (
+    <li key={id} className="cart-line">
+      {image && (
+        <Image
+          alt={title}
+          aspectRatio="1/1"
+          data={image}
+          height={100}
+          loading="lazy"
+          width={100}
+        />
+      )}
+
+      <div>
+        <Link
+          prefetch="intent"
+          to={lineItemUrl}
+          onClick={() => {
+            if (layout === 'aside') {
+              // close the drawer
+              window.location.href = lineItemUrl;
+            }
+          }}
+        >
+          <p>
+            <strong>{product.title}</strong>
+          </p>
+        </Link>
+        <CartLinePrice line={line} as="span" />
+        <ul>
+          {selectedOptions.map((option) => (
+            <li key={option.name}>
+              <small>
+                {option.name}: {option.value}
+              </small>
+            </li>
+          ))}
+        </ul>
+        <CartLineQuantity line={line} />
+      </div>
+    </li>
+  );
+}
+
+function CartCheckoutActions({checkoutUrl}: {checkoutUrl: string}) {
+  if (!checkoutUrl) return null;
+
+  return (
+    <div>
+      <a href={checkoutUrl} target="_self">
+        <p>Continue to Checkout &rarr;</p>
+      </a>
+      <br />
+    </div>
+  );
+}
+
+export function CartSummary({
+  cost,
+  layout,
+  children = null,
+}: {
+  children?: React.ReactNode;
+  cost: CartApiQueryFragment['cost'];
+  layout: CartMainProps['layout'];
+}) {
+  const className =
+    layout === 'page' ? 'cart-summary-page' : 'cart-summary-aside';
+
+  return (
+    <div aria-labelledby="cart-summary" className={className}>
+      <h4>Totals</h4>
+      <dl className="cart-subtotal">
+        <dt>Subtotal</dt>
+        <dd>
+          {cost?.subtotalAmount?.amount ? (
+            <Money data={cost?.subtotalAmount} />
+          ) : (
+            '-'
+          )}
+        </dd>
+      </dl>
+      {children}
+    </div>
+  );
+}
+
+function CartLineRemoveButton({lineIds}: {lineIds: string[]}) {
+  return (
+    <CartForm
+      route="/cart"
+      action={CartForm.ACTIONS.LinesRemove}
+      inputs={{lineIds}}
+    >
+      <button type="submit">Remove</button>
+    </CartForm>
+  );
+}
+
+function CartLineQuantity({line}: {line: CartLine}) {
+  if (!line || typeof line?.quantity === 'undefined') return null;
+  const {id: lineId, quantity} = line;
+  /***********************************************/
+  /**********  EXAMPLE UPDATE STARTS  ************/
+  const {increment, minimum} = line.merchandise.quantityRule;
+  const prevQuantity = Number(Math.max(0, quantity - increment).toFixed(0));
+  const nextQuantity = Number((quantity + increment).toFixed(0));
+  /**********   EXAMPLE UPDATE END   ************/
+  /***********************************************/
+
+  return (
+    <div className="cart-line-quantity">
+      <small>Quantity: {quantity} &nbsp;&nbsp;</small>
+      <CartLineUpdateButton lines={[{id: lineId, quantity: prevQuantity}]}>
+        <button
+          aria-label="Decrease quantity"
+          /***********************************************/
+          /**********  EXAMPLE UPDATE STARTS  ************/
+          disabled={quantity <= minimum}
+          /**********   EXAMPLE UPDATE END   ************/
+          /***********************************************/
+          name="decrease-quantity"
+          value={prevQuantity}
+        >
+          <span>&#8722; </span>
+        </button>
+      </CartLineUpdateButton>
+      &nbsp;
+      <CartLineUpdateButton lines={[{id: lineId, quantity: nextQuantity}]}>
+        <button
+          aria-label="Increase quantity"
+          name="increase-quantity"
+          value={nextQuantity}
+        >
+          <span>&#43;</span>
+        </button>
+      </CartLineUpdateButton>
+      &nbsp;
+      <CartLineRemoveButton lineIds={[lineId]} />
+    </div>
+  );
+}
+
+function CartLinePrice({
+  line,
+  priceType = 'regular',
+  ...passthroughProps
+}: {
+  line: CartLine;
+  priceType?: 'regular' | 'compareAt';
+  [key: string]: any;
+}) {
+  if (!line?.cost?.amountPerQuantity || !line?.cost?.totalAmount) return null;
+
+  const moneyV2 =
+    priceType === 'regular'
+      ? line.cost.totalAmount
+      : line.cost.compareAtAmountPerQuantity;
+
+  if (moneyV2 == null) {
+    return null;
+  }
+
+  return (
+    <div>
+      <Money withoutTrailingZeros {...passthroughProps} data={moneyV2} />
+    </div>
+  );
+}
+
+export function CartEmpty({
+  hidden = false,
+  layout = 'aside',
+}: {
+  hidden: boolean;
+  layout?: CartMainProps['layout'];
+}) {
+  return (
+    <div hidden={hidden}>
+      <br />
+      <p>
+        Looks like you haven&rsquo;t added anything yet, let&rsquo;s get you
+        started!
+      </p>
+      <br />
+      <Link
+        to="/collections"
+        onClick={() => {
+          if (layout === 'aside') {
+            window.location.href = '/collections';
+          }
+        }}
+      >
+        Continue shopping →
+      </Link>
+    </div>
+  );
+}
+
+function CartDiscounts({
+  discountCodes,
+}: {
+  discountCodes: CartApiQueryFragment['discountCodes'];
+}) {
+  const codes: string[] =
+    discountCodes
+      ?.filter((discount) => discount.applicable)
+      ?.map(({code}) => code) || [];
+
+  return (
+    <div>
+      {/* Have existing discount, display it with a remove option */}
+      <dl hidden={!codes.length}>
+        <div>
+          <dt>Discount(s)</dt>
+          <UpdateDiscountForm>
+            <div className="cart-discount">
+              <code>{codes?.join(', ')}</code>
+              &nbsp;
+              <button>Remove</button>
+            </div>
+          </UpdateDiscountForm>
+        </div>
+      </dl>
+
+      {/* Show an input to apply a discount */}
+      <UpdateDiscountForm discountCodes={codes}>
+        <div>
+          <input type="text" name="discountCode" placeholder="Discount code" />
+          &nbsp;
+          <button type="submit">Apply</button>
+        </div>
+      </UpdateDiscountForm>
+    </div>
+  );
+}
+
+function UpdateDiscountForm({
+  discountCodes,
+  children,
+}: {
+  discountCodes?: string[];
+  children: React.ReactNode;
+}) {
+  return (
+    <CartForm
+      route="/cart"
+      action={CartForm.ACTIONS.DiscountCodesUpdate}
+      inputs={{
+        discountCodes: discountCodes || [],
+      }}
+    >
+      {children}
+    </CartForm>
+  );
+}
+
+function CartLineUpdateButton({
+  children,
+  lines,
+}: {
+  children: React.ReactNode;
+  lines: CartLineUpdateInput[];
+}) {
+  return (
+    <CartForm
+      route="/cart"
+      action={CartForm.ACTIONS.LinesUpdate}
+      inputs={{lines}}
+    >
+      {children}
+    </CartForm>
+  );
+}