Constantly refreshing MUI Paper components

I am currently in the process of developing a fitness app that includes a timer. I have chosen to use MUI for this project. However, I've encountered an issue that is causing my app to break. Whenever I incorporate the Paper components or any Item based on Paper, the app keeps reloading or rerendering. This becomes problematic when trying to input values into a TextArea as it loses focus due to the constant reloading.

import { React, useState, useEffect } from "react";
import { useParams } from "react-router-dom";
import { Link } from "react-router-dom";
import { Button, Fab } from "@mui/material";
import Dialog from "@mui/material/Dialog";
import DialogActions from "@mui/material/DialogActions";
import DialogContent from "@mui/material/DialogContent";
import DialogContentText from "@mui/material/DialogContentText";
import DialogTitle from "@mui/material/DialogTitle";
import Stack from "@mui/material/Stack";
import PauseIcon from "@mui/icons-material/Pause";
import PlayIcon from "@mui/icons-material/PlayArrow";
// And so on...

Answer №1

Avoid nesting components inside each other to prevent unnecessary rendering. When a component is created within another component, the diffing algorithm treats it as a new component on every render. To resolve this, move the Item outside of the WorkoutProgress.

New functions (components) are created when nested components are used, triggering re-renders after state updates. This causes the parent component, in this case, WorkoutProgress, to be executed again along with everything inside it. The newly created Item also gets compared by reference due to JavaScript's function comparison nature.

  • Due to different references, old and new Items are not considered equal by the diffing algorithm.
  • As a result, the previous Item gets unmounted and the new one gets mounted.

To avoid this issue, refrain from creating components within other components. If necessary, memoize the reference using useCallback or useMemo.

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