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Graph/repeated-observer-listener-registration

AntiPattern

Repeated Observer & Listener

repeated-observer-listener-registration

A recurring UI motif where scroll/visibility observers and event listeners are registered or re-created too often, causing duplicated handlers and frequent state updates that trigger unnecessary re-renders and sluggish performance.

Node Details

Public graph metadata

Updated5/1/2026

Connections

30 linked nodes

MATCHESSolution

you can use Zustand getters and optimistic update — multiple or rapid clicks could actually cause the updates to be executed but out of order. Tension: no optimistic update so u see that delay (lag) you said about.

MATCHESSolution

subscribe to store changes to fire side-effect — What you can do is to subscribe to store changes. Tension: you will have to send the whole state of the store every time it changed. Outcome: use subscribe with selectors.

MATCHESSolution

For a regular use-case you can do something like this for e.g. the pagination — onPaginationChange: (updater) => {. Tension: updater instanceof Function ? updater(pagination) : updater. Outcome: setSelected(newValue);.

MATCHESSolution

Initialize and return the state from the store initializer with `windowSize: window.innerWidth`, and only register the resize listener (cleanup is handled by React, not by returning `removeEventListener` from the `create` function).

MATCHESSolution

Track loading per request (e.g., per action or with a counter) instead of one global boolean, or guard/remain mounted so that remounting does not retrigger the fetch. E.g., use separate `loading` flags or increment/decrement an in-flight counter and render spinner only when the counter is > 0.

MATCHESSolution

Keep the latest sequence in a mutable ref and have all pointer handlers read from `sequenceRef.current` instead of a captured state value. Update `sequenceRef.current` via a `useEffect` whenever the sequence changes, while registering handlers once (and/or recreating them only based on the ref, not the state).

MATCHESSolution

Treat the selected value as a shared reference (avoid unnecessary cloning/deriving new arrays/objects in selectors). If memory pressure occurs, ensure large datasets are not being copied or accidentally retained (e.g., avoid creating new Float32Array/object instances per render; consider weak caching patterns such as WeakMap only for derived mappings).

MATCHESSolution

Create/move the React.lazy import initialization so it isn’t executed on every render (e.g., place the lazy call in the same component as Suspense) to ensure the import is stable and doesn’t trigger repeated re-renders.

MATCHESSolution

Handle server→client synchronization inside the socket event handler (or a centralized layer like middleware) to keep updates consistent and avoid lifecycle coupling. Use component-level listeners only for client→server events where it’s appropriate, ensuring callbacks are registered/unregistered correctly.

MATCHESSolution

removing the `[state=open]:animate-in` from both `DialogPrimitive.Overlay` and `DialogPrimitive.Content` fixed the problem for me — Dialog box component in my React application using Shadcn UI. Tension: While this fixed the flickering issue, I'm wondering if there's a better or more elegant solution. Outcome: removed the animation-related classes from the DialogPrimitive.Content component.

MATCHESSolution

Instead of `useRef`, we can change it to `useState` — for a DOM node that may not exist or change during the component's render. Tension: so that we can track ref changes in the state and trigger re-renders as needed.

MATCHESSolution

Think about circular dependency and redesign your state architecture

MATCHESSolution

Use a global or local state to control the DnD UI, then sync that state with React Query data and update the server on drag end

MATCHESSolution

I try putting a setName(data.name) inside a useEffect that runs only when "isLoading" changes, and it works — edit/change the "name" retrieved by the query. Tension: I would think there is a better and more clean way to do it. Outcome: use a `useEffect` hook to "synchronize" a React state to an external source.

MATCHESSolution

it indicates the number of observers — React Query Devtools. Tension: I can't find it's meaning. Outcome: Here is discussion on github that talks about it.

MATCHESSolution

rendering the rows as a non complex component like a spinner or something — my laggy components were loading in as i scrolled etc. Tension: excessive blanking of the page. Outcome: using useEffect to determine if it is fully rendered, you can resolve most of the major blanking issues.

MATCHESSolution

Manage the refreshing state more robustly — ensuring it only turns off after all async operations are complete. Tension: remove the arbitrary timeout. Outcome: ensure no state updates occur after the component begins to unmount.

MATCHESSolution

Create a memoized router context object from the app context and call `router.invalidate()` in a `useEffect` when that memoized object changes, so `beforeLoad`/`loader` rerun with the updated data.

MATCHESSolution

No ref to prevent redundant state updates — `setState` inside an observer callback that runs on every scroll event. Tension: React still processes the `setState` call even if the value is the same. Outcome: const lastIdRef = useRef(null);.

MATCHESSolution

Pass the index as a selector parameter (e.g., useSelector((state, props) => state.playerDataArray[props.index])) or define selectors outside the component (optionally with reselect/createSelector) to encapsulate state shape and ensure efficient recomputation based on dependencies.

MATCHESSolution

Ensure selectors are properly memoized for the `id` argument (e.g., using selector factory per `id` or `createSelector` with stable input selectors) and limit recomputation by selecting only the needed primitive values/slices; return the original memoized wallet when inputs are unchanged or use referentially stable outputs.

MATCHESSolution

Pass a comparator like shallowEqual (or memoize the derived selector) to prevent rerenders when the selector result hasn’t meaningfully changed.

MATCHESSolution

Keep two listeners or refactor so one wrapper function registers both listeners that call the same shared effect logic; alternatively, create a single predicate/matcher that encompasses both conditions if feasible.

MATCHESSolution

Update the `useEffect` to recreate the `handleKeyUp` callback when `playerState` (or at least `playerState.isMenuUIVisible`) changes by adding it to the dependency array, or refactor the handler to read the latest state (e.g., via a ref) so it doesn’t rely on stale closure values.

MATCHESSolution

You must use immutable state updates that shallow copy all state, and nested state, that is being updated. — when the event is "user-changed-channel". Tension: `const obj = { ...state.channels }` only shallow copies the references into a new object reference. Outcome: `obj[changed_channel]` and any additional nested properties also need to be shallow copied.

MATCHESSolution

the content of the dock gets changed according to the new chat room (even though it's only for a split second) then closes — When I'm in one of the chat rooms, I can change chat rooms by clicking on the other chat rooms. Outcome: place the navigation action in a short timeout so it's placed at the end of Javascript's event loop and allows the dispatched actions to process and React to rerender once.

MATCHESSolution

I suggest a minor refactor to add some local React state to hold this value and a `useEffect` hook — implementing a form with login logout functionality. Tension: This condition will always return true.

MATCHESSolution

Use a single ref that stores an array of item nodes (via ref callbacks) and update an index-based selection state on keydown. On arrow navigation, focus the corresponding node from the ref array (e.g., refs.current[selectedIndex].focus()).

MATCHESSolution

Trigger focus after readOnly updates—e.g., set a flag on double-click and call focus in a useEffect (or a callback) once readOnly is false.

MATCHESSolution

`useCallback` needs to be used — to be used as a callback and thus prevent the unnecessary re-renders. Tension: `memo` can't prevent `ExpensiveComponent` from being re-rendered. Outcome: const handleRender = useCallback(() => {...}, []);.

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