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docs(headless commerce SSR): add parameter manager in SSR + nextjs sa…
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91 changes: 91 additions & 0 deletions
91
packages/samples/headless-ssr-commerce/components/parameter-manager.tsx
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| 'use client'; | ||
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| import {useParameterManager} from '@/lib/commerce-engine'; | ||
| import {buildParameterSerializer} from '@coveo/headless-react/ssr-commerce'; | ||
| import {useSearchParams} from 'next/navigation'; | ||
| import {useEffect, useMemo, useRef} from 'react'; | ||
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| export default function ParameterManager({url}: {url: string | null}) { | ||
| const {state, methods} = useParameterManager(); | ||
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| const {serialize, deserialize} = buildParameterSerializer(); | ||
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| const initialUrl = useMemo(() => new URL(url ?? location.href), [url]); | ||
| const previousUrl = useRef(initialUrl.href); | ||
| const searchParams = useSearchParams(); | ||
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| /** | ||
| * This flag serves to ensure that history navigation between pages does not clear commerce parameters and result in | ||
| * history state loss. | ||
| * | ||
| * When navigating to a new page, the ParameterManager controller is rebuilt with its initial state. Consequently, if | ||
| * we serialize the state parameters and push them to the browser history when navigating back to a page, any commerce | ||
| * parameters in the URL that were not part of the controller's initial state will be lost. | ||
| * | ||
| * By having a "guard" that prevents effect execution when the flag is set to true and sets the flag back to false, | ||
| * we are able to prevent this. | ||
| * | ||
| * For instance, suppose that a user initially navigates to /search?q=test. They then select the next page of results | ||
| * so that the URL becomes /search?q=test&page=1. Then, they navigate to a product page (e.g., /product/123). At this | ||
| * point, if they use their browser history to go back to the search page, the URL will be /search?q=test&page=1, but | ||
| * the ParameterManager controller's state will have been reset to only include the q=test parameter. Thanks to the | ||
| * flag, however, the navigation event will not cause the URL to be updated, but the useSearchParams hook will cause | ||
| * the controller to synchronize its state with the URL, thus preserving the page=1 parameter. | ||
| */ | ||
| const flag = useRef(true); | ||
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| /** | ||
| * When the URL search parameters change, this effect deserializes them and synchronizes them into the | ||
| * ParameterManager controller's state. | ||
| */ | ||
| useEffect(() => { | ||
| if (methods === undefined) { | ||
| return; | ||
| } | ||
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| if (flag.current) { | ||
| flag.current = false; | ||
| return; | ||
| } | ||
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| const newCommerceParams = deserialize(searchParams); | ||
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| const newUrl = serialize(newCommerceParams, new URL(previousUrl.current)); | ||
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| if (newUrl === previousUrl.current) { | ||
| return; | ||
| } | ||
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| flag.current = true; | ||
| previousUrl.current = newUrl; | ||
| methods.synchronize(newCommerceParams); | ||
| }, [deserialize, methods, searchParams, serialize]); | ||
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| /** | ||
| * When the ParameterManager controller's state changes, this effect serializes it into the URL and pushes the new URL | ||
| * to the browser history. | ||
| * */ | ||
| useEffect(() => { | ||
| // Ensures that the effect only executes if the controller is hydrated, so that it plays well with the other effect. | ||
| if (methods === undefined) { | ||
| return; | ||
| } | ||
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| if (flag.current) { | ||
| flag.current = false; | ||
| return; | ||
| } | ||
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| const newUrl = serialize(state.parameters, new URL(previousUrl.current)); | ||
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| if (previousUrl.current === newUrl) { | ||
| return; | ||
| } | ||
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| flag.current = true; | ||
| previousUrl.current = newUrl; | ||
| history.pushState(null, document.title, newUrl); | ||
| }, [methods, serialize, state.parameters]); | ||
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| return null; | ||
| } |
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