⚡ Bolt: Optimize ScheduleContainer Rendering#43
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- Implements `useMediaQuery` hook to detect viewport size. - Updates `ScheduleContainer` to conditionally render `ScheduleGrid` (desktop) or `ScheduleMobile` (mobile) based on viewport size. - Prevents rendering both components and hiding one with CSS, reducing DOM nodes and memory usage. - Maintains SSR and hydration compatibility by rendering both (hidden) initially. - Adds `__tests__/components/schedule/ScheduleContainer.test.tsx` to verify the logic. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
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Summary of ChangesHello @anyulled, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed! This pull request introduces a significant performance optimization for the Highlights
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Code Review
This pull request introduces a significant performance optimization by conditionally rendering the desktop and mobile schedule views instead of rendering both and hiding one with CSS. The new useMediaQuery hook is a great addition for handling responsive logic, and the new tests properly cover the different rendering scenarios. My feedback includes a few suggestions to enhance the code's clarity and maintainability.
| export default function ScheduleContainer({ initialSchedule, year }: ScheduleContainerProps) { | ||
| const { savedSessionIds } = useScheduleContext(); | ||
| const [showSavedOnly, setShowSavedOnly] = useState(false); | ||
| const isMobile = useMediaQuery("(max-width: 991px)"); |
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The media query string (max-width: 991px) is hardcoded. This is considered a "magic string" and can make maintenance harder. If this breakpoint is used elsewhere or needs to be updated, it would have to be changed in multiple places. It's a best practice to define such values as constants in a shared theme or constants file and reference it here, for example: const isMobile = useMediaQuery(breakpoints.lg);.
| {(isMobile === null || isMobile === false) && ( | ||
| <div className="d-none d-lg-block"> | ||
| <ScheduleGrid schedule={filteredSchedule} year={year} /> | ||
| </div> | ||
| )} | ||
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| {/* Mobile View */} | ||
| {(isMobile === null || isMobile === true) && ( | ||
| <div className="d-lg-none"> | ||
| <ScheduleMobile schedule={filteredSchedule} year={year} /> | ||
| </div> | ||
| )} |
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The conditional rendering logic is correct, but it can be simplified for better readability. The expressions isMobile === null || isMobile === false and isMobile === null || isMobile === true can be made more concise by checking for the opposite case, which also correctly handles the null state during server-side rendering.
{/* Desktop View */}
{isMobile !== true && (
<div className="d-none d-lg-block">
<ScheduleGrid schedule={filteredSchedule} year={year} />
</div>
)}
{/* Mobile View */}
{isMobile !== false && (
<div className="d-lg-none">
<ScheduleMobile schedule={filteredSchedule} year={year} />
</div>
)}
| useEffect(() => { | ||
| const media = window.matchMedia(query); | ||
| if (media.matches !== matches) { | ||
| setMatches(media.matches); | ||
| } | ||
| const listener = (e: MediaQueryListEvent) => setMatches(e.matches); | ||
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| // Support for older browsers and modern ones | ||
| if (media.addEventListener) { | ||
| media.addEventListener("change", listener); | ||
| } else { | ||
| media.addListener(listener); | ||
| } | ||
| return () => { | ||
| if (media.removeEventListener) { | ||
| media.removeEventListener("change", listener); | ||
| } else { | ||
| media.removeListener(listener); | ||
| } | ||
| }; | ||
| // eslint-disable-next-line react-hooks/exhaustive-deps | ||
| }, [query]); |
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The useEffect hook can be simplified to improve readability and remove the need for eslint-disable-next-line. You can set the initial state directly on the client-side render. React is smart enough to bail out of a re-render if the state value doesn't change, so there's no performance penalty. This change makes the hook's logic clearer and aligns better with standard hook patterns.
useEffect(() => {
const media = window.matchMedia(query);
// Set the initial value on the client.
setMatches(media.matches);
const listener = (e: MediaQueryListEvent) => setMatches(e.matches);
// Support for older browsers and modern ones
if (media.addEventListener) {
media.addEventListener("change", listener);
} else {
media.addListener(listener);
}
return () => {
if (media.removeEventListener) {
media.removeEventListener("change", listener);
} else {
media.removeListener(listener);
}
};
}, [query]);
…ting - Implements `useMediaQuery` hook to conditionally render `ScheduleGrid` (desktop) or `ScheduleMobile` (mobile) components. - Significantly reduces DOM nodes and memory usage by unmounting the hidden view instead of using CSS `display: none`. - Maintains SSR compatibility by rendering both components initially (hidden). - Fixes formatting issues in `__tests__/components/schedule/ScheduleContainer.test.tsx`, `components/schedule/ScheduleContainer.tsx`, and `stylelint.config.mjs` to resolve CI lint failure. - Verified with unit tests (`npm test __tests__/components/schedule/ScheduleContainer.test.tsx`) and lint checks (`npm run lint`). Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
- Implements `useMediaQuery` hook to conditionally render `ScheduleGrid` (desktop) or `ScheduleMobile` (mobile) components. - Significantly reduces DOM nodes and memory usage by unmounting the hidden view instead of using CSS `display: none`. - Maintains SSR compatibility by rendering both components initially (hidden). - Fixes formatting issues in `__tests__/components/schedule/ScheduleContainer.test.tsx` and `components/schedule/ScheduleContainer.tsx`. - Verified with unit tests (`npm test __tests__/components/schedule/ScheduleContainer.test.tsx`) and lint checks (`npm run lint`). - Note: Unrelated Cypress failure on home page ignored as changes are isolated to Schedule component. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
…ting - Implements `useMediaQuery` hook to conditionally render `ScheduleGrid` (desktop) or `ScheduleMobile` (mobile) components. - Significantly reduces DOM nodes and memory usage by unmounting the hidden view instead of using CSS `display: none`. - Maintains SSR compatibility by rendering both components initially (hidden). - Fixes formatting issues in `__tests__/components/schedule/ScheduleContainer.test.tsx` and `components/schedule/ScheduleContainer.tsx`. - Verified with unit tests (`npm test __tests__/components/schedule/ScheduleContainer.test.tsx`) and lint checks (`npm run lint`). - Note: Unrelated Cypress failure on home page ignored as changes are isolated to Schedule component. Co-authored-by: anyulled <100741+anyulled@users.noreply.github.com>
1 participant
⚡ Bolt: Optimize ScheduleContainer Rendering
💡 What:
Implemented conditional rendering for the
ScheduleContainercomponent using a newuseMediaQueryhook. Instead of rendering both desktop (ScheduleGrid) and mobile (ScheduleMobile) views and hiding one with CSS, the application now renders only the relevant component for the current viewport.🎯 Why:
Rendering both views doubled the number of DOM nodes and React components for the schedule, which is a heavy part of the application (potentially hundreds of session cards). This wasted memory and CPU during reconciliation, especially on mobile devices.
📊 Impact:
🔬 Measurement:
Verified with unit tests in
__tests__/components/schedule/ScheduleContainer.test.tsxthat confirm:PR created automatically by Jules for task 6933441994853421305 started by @anyulled