Encountered a lower number of hooks than anticipated while utilizing a react-redux translate function

Question

Encountered a lower number of hooks than anticipated while utilizing a react-redux translate function

Whenever I use the code below, a message saying

Rendered fewer hooks than expected. This may be caused by an accidental early return statement.

pops up:

{headRows
    // Filter table columns based on user selected input
    .filter(item => displayedColumns.includes(item.id))
    .map(row => (
      <TableCell
        key={row.id}
        align={row.numeric ? "right" : "left"}
        padding={row.disablePadding ? "none" : "default"}
        sortDirection={orderBy === row.id ? order : false}
      >
        <TableSortLabel
          active={orderBy === row.id}
          direction={order}
          onClick={createSortHandler(row.id)}
        >
          {useTranslation(row.label)}
        </TableSortLabel>
      </TableCell>
))}

This is how my translate function appears:

import { useSelector } from "react-redux";

export const useTranslations = () =>
    useSelector(state => state.translations.data, []);

When I pass a string into it, the translate function works fine. But if I replace {useTranslation(row.label)} with {row.label}, the error message disappears. Can't figure out why since I know Hooks shouldn't be called inside loops, conditions, or nested functions here, right?

reactjs material-ui react-hooks

Answer 1

Answer №1

Your current setup involves a component that renders a list of cells, with each cell being rendered by a callback passed to the map. This results in both a loop and nested function within your code.

To improve this structure, I recommend extracting the callback to a new component and rendering it independently. By doing so, each cell will be its own component, allowing you to utilize hooks more effectively.


const MyTableCell = props => {
   const {row} = props;
   const title = useTranslation(row.label);
   return (
       <TableCell>
        <TableSortLabel>
          {title}
        </TableSortLabel>
      </TableCell>
   )

}

// Updated implementation

{headRows
    // Filter table columns based on user selected input
    .filter(item => displayedColumns.includes(item.id))
    .map(row => (
      <MyTableCell row={row} key={row.id} />
))}

Answer 2

Your current setup involves a component that renders a list of cells, with each cell being rendered by a callback passed to the map. This results in both a loop and nested function within your code.

To improve this structure, I recommend extracting the callback to a new component and rendering it independently. By doing so, each cell will be its own component, allowing you to utilize hooks more effectively.


const MyTableCell = props => {
   const {row} = props;
   const title = useTranslation(row.label);
   return (
       <TableCell>
        <TableSortLabel>
          {title}
        </TableSortLabel>
      </TableCell>
   )

}

// Updated implementation

{headRows
    // Filter table columns based on user selected input
    .filter(item => displayedColumns.includes(item.id))
    .map(row => (
      <MyTableCell row={row} key={row.id} />
))}

Answer 3

Answer №2

Avoid using Hooks within loops, conditions, or nested functions.

-- https://reactjs.org/docs/hooks-rules.html#only-call-hooks-at-the-top-level-unique

Answer 4

Avoid using Hooks within loops, conditions, or nested functions.

-- https://reactjs.org/docs/hooks-rules.html#only-call-hooks-at-the-top-level-unique

Encountered a lower number of hooks than anticipated while utilizing a react-redux translate function

Answer №1

Answer №2

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