This guide shows you how to use a cart handler to update selected delivery options, such as standard or expedited delivery. ## Requirements - You've completed the [quickstart guide](/docs/storefronts/headless/hydrogen/getting-started). - You've [set up a cart handler](/docs/storefronts/headless/hydrogen/cart/setup). ## Step 1: Read selected and available delivery groups Carts return an empty array for available delivery groups by default. To get a list of delivery groups, the cart must be associated with a customer access token by [updating the buyer identity](/docs/storefronts/headless/hydrogen/cart/buyer-identity) when a customer is logged in. Update the cart query fragment to return selected and available delivery options. <p> <div class="react-code-block" data-preset="file"> <div class="react-code-block-preload ThemeMode-dim"> <div class="react-code-block-preload-bar "></div> <div class="react-code-block-preload-placeholder-container"> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> 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data-title="JavaScript" data-filename="server.js"> RAW_MD_CONTENTconst cart = createCartHandler({ storefront, getCartId: cartGetIdDefault(request.headers), setCartId: cartSetIdDefault(), cartQueryFragment: CART_QUERY_FRAGMENT, }); const CART_QUERY_FRAGMENT = `#graphql fragment CartApiQuery on Cart { id deliveryGroups(first: 1) { nodes { id deliveryOptions { handle title code estimatedCost { amount currencyCode } } selectedDeliveryOption { handle } } } } `; END_RAW_MD_CONTENT</script> <script type="text/plain" data-language="jsx" data-title="TypeScript" data-filename="server.ts"> RAW_MD_CONTENTconst cart = createCartHandler({ storefront, getCartId: cartGetIdDefault(request.headers), setCartId: cartSetIdDefault(), cartQueryFragment: CART_QUERY_FRAGMENT, }); const CART_QUERY_FRAGMENT = `#graphql fragment CartApiQuery on Cart { id deliveryGroups(first: 1) { nodes { id deliveryOptions { handle title code estimatedCost { amount currencyCode } } selectedDeliveryOption { handle } } } } `; END_RAW_MD_CONTENT</script> </div> </p> ## Step 2: Create a select delivery option form Use Remix's [`useFetcher`](https://remix.run/docs/en/main/hooks/use-fetcher) hook to create a cart note form. The hook submits a form request to the `/cart` route's action when users choose a delivery option. You can use this component anywhere in the app. When you use `fetcher.submit`, make sure there's a data key with the name `CartForm.INPUT_NAME`. The key value must be a JSON stringified object with `action` and `inputs` defined. <p> <div class="react-code-block" data-preset="file"> <div class="react-code-block-preload ThemeMode-dim"> <div class="react-code-block-preload-bar "></div> <div class="react-code-block-preload-placeholder-container"> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> 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class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> </div> </div> <script type="text/plain" data-language="jsx" data-title="JavaScript" data-filename="/app/components/SelectDeliveryGroup.jsx"> RAW_MD_CONTENTimport {CartForm} from '@shopify/hydrogen'; function SelectDeliveryGroup({deliveryGroups}) { const fetcher = useFetcher(); const group = deliveryGroups?.nodes[0]; const deliveryOptions = group.deliveryOptions; const selectedHandle = group.selectedDeliveryOption?.handle; return ( <div> {deliveryOptions.map((option) => { return ( <div key={option.handle}> <input checked={selectedHandle === option.handle} type="radio" name="delivery" value={option.handle} id={option.handle} onChange={(event) => { fetcher.submit( { [CartForm.INPUT_NAME]: JSON.stringify({ action: CartForm.ACTIONS.SelectedDeliveryOptionsUpdate, inputs: { selectedDeliveryOptions: [{ deliveryGroupId: group.id, deliveryOptionHandle: event.target.value, }], }, }), }, {method: 'POST', action: '/cart'} ) }} /> <label htmlFor={option.handle}>{option.title}</label> </div> ) })} </div> ); } END_RAW_MD_CONTENT</script> <script type="text/plain" data-language="jsx" data-title="TypeScript" data-filename="/app/components/SelectDeliveryGroup.tsx"> RAW_MD_CONTENTimport {CartForm, type CartActionInput} from '@shopify/hydrogen'; import type {Cart} from '@shopify/hydrogen/storefront-api-types'; function SelectDeliveryGroup({ deliveryGroups }: { deliveryGroups: Cart['deliveryGroups']; }) { const fetcher = useFetcher(); const group = deliveryGroups?.nodes[0]; const deliveryOptions = group.deliveryOptions; const selectedHandle = group.selectedDeliveryOption?.handle; return ( <div> {deliveryOptions.map((option) => { return ( <div key={option.handle}> <input checked={selectedHandle === option.handle} type="radio" name="delivery" value={option.handle} id={option.handle} onChange={(event) => { fetcher.submit( { [CartForm.INPUT_NAME]: JSON.stringify({ action: CartForm.ACTIONS.SelectedDeliveryOptionsUpdate, inputs: { selectedDeliveryOptions: [{ deliveryGroupId: group.id, deliveryOptionHandle: event.target.value, }], }, }), }, {method: 'POST', action: '/cart'} ) }} /> <label htmlFor={option.handle}>{option.title}</label> </div> ) })} </div> ); } END_RAW_MD_CONTENT</script> </div> </p> ## Step 3: Handle the selected delivery option form request Handle the selected delivery option form request in an `action`. Use the `cart`, created from [`createCartHandler`](/docs/api/hydrogen/latest/utilities/createcarthandler), to handle cart mutation requests to the Storefront API. <p> <div class="react-code-block" data-preset="file"> <div class="react-code-block-preload ThemeMode-dim"> <div class="react-code-block-preload-bar "></div> <div class="react-code-block-preload-placeholder-container"> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div 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class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> <div class="react-code-block-preload-code-container"> <div class="react-code-block-preload-codeline-number"></div> <div class="react-code-block-preload-codeline"></div> </div> </div> </div> <script type="text/plain" data-language="jsx" data-title="JavaScript" data-filename="/app/routes/cart.jsx"> RAW_MD_CONTENTimport {CartForm} from '@shopify/hydrogen'; import invariant from 'tiny-invariant'; export async function action({request, context}) { const {cart} = context; const formData = await request.formData(); const {action, inputs} = CartForm.getFormInput(formData); let result; switch(action) { case CartForm.ACTIONS.SelectedDeliveryOptionsUpdate: result = await cart.updateSelectedDeliveryOption(inputs.selectedDeliveryOptions); break; default: invariant(false, `${action} cart action is not defined`); } // The Cart ID might change after each mutation, so update it each time. const headers = cart.setCartId(result.cart.id); return json( result, {status: 200, headers}, ); } END_RAW_MD_CONTENT</script> <script type="text/plain" data-language="jsx" data-title="TypeScript" data-filename="/app/routes/cart.tsx"> RAW_MD_CONTENTimport { type CartQueryData, CartForm, } from '@shopify/hydrogen'; import invariant from 'tiny-invariant'; export async function action({request, context}: ActionArgs) { const {cart} = context; const formData = await request.formData(); const {action, inputs} = CartForm.getFormInput(formData); let result: CartQueryData; switch(action) { case CartForm.ACTIONS.SelectedDeliveryOptionsUpdate: result = await cart.updateSelectedDeliveryOption(inputs.selectedDeliveryOptions); break; default: invariant(false, `${action} cart action is not defined`); } // The Cart ID might change after each mutation, so update it each time. const headers = cart.setCartId(result.cart.id); return json( result, {status: 200, headers}, ); } END_RAW_MD_CONTENT</script> </div> </p>