Why isn't my <Table> component re-rendering after state updates in React?

Below is an explanation and a couple of options to fix the issue.

What’s Happening

Your custom hook (UpdateList) already calls the function to update the list in its own useEffect. Then in your SalesList component you’re also calling updateList on mount. When you try to add updateList to the dependency array in SalesList, it creates an infinite loop because the updateList reference changes on each render (since it isn’t memoized).

Even though your state (list) is updated (as seen in the console), the extra effect call in the SalesList component can interfere with when the component re-renders. In short, the duplicated calls and a non-stable (non-memoized) updateList function cause unexpected behavior.

Recommended Solutions

You have two possible approaches:

1. Let the Hook Handle the Initial Fetch

Since your UpdateList hook already updates the list on mount (via its own useEffect) you don’t need call updateList again in your SalesList component on mount.

SalesList.jsx

JAVASCRIPTCopied
import React, { useEffect } from 'react';
import { Table } from 'antd';
import useUpdateList from '../hooks/updateList'; // renamed for clarity

const SalesList = () => {
    const { list, loading, error, updateList } = useUpdateList();

    // Remove this effect if the hook is already fetching data on mount
    // useEffect(() => {
    //     updateList();
    // }, []);

    useEffect(() => {
        console.log('List updated in the component:', list);
    }, [list]);

    const columns = [
        { title: 'Name', dataIndex: 'name', key: 'name' },
        { title: 'Price', dataIndex: 'price', key: 'price' },
        { title: 'Quantity', dataIndex: 'quantity', key: 'quantity' },
        { title: 'Amount Received', dataIndex: 'amountReceived', key: 'amountReceived' },
    ];

    if (loading) return <div>Loading...</div>;
    if (error) return <div>Error: {error.message}</div>;

    return <Table dataSource={list} columns={columns} rowKey="ID" />;
};

export default SalesList;

Now the hook’s own effect will call updateList and update the list state, causing the component to re-render when the list changes.

2. Memoize the updateList Function to Avoid an Infinite Loop

If you need to call updateList from SalesList (for example, later from a refresh button), it’s a good idea to memoize the updateList function in your custom hook. That way, you can safely include it in dependency arrays.

UpdateList.jsx (renamed to useUpdateList for clarity)

JAVASCRIPTCopied
import { useState, useEffect, useCallback } from 'react';
import useFetchData from '../services/api/showData';

const useUpdateList = () => {
    const { fetchData, loading, error } = useFetchData();
    const [list, setList] = useState([]);

    const updateList = useCallback(async () => {
        try {
            const newList = await fetchData();
            setList([...newList]); // Spread operator creates a new array reference
            console.log('New list obtained:', newList);
        } catch (error) {
            console.error('An error occurred while updating your data', error);
        }
    }, [fetchData]);

    useEffect(() => {
        updateList();
    }, [updateList]); // Now updateList is stable and will not cause an infinite loop

    return { list, loading, error, updateList };
};

export default useUpdateList;

Now, if you want to manually trigger updateList in SalesList you can safely do so because updateList won’t change between renders:

JAVASCRIPTCopied
useEffect(() => {
    updateList();
}, [updateList]); // This would now work without causing an infinite loop.

Summary

• Option 1: Remove duplicate calls by letting the hook handle the initial fetch.
• Option 2: Memoize updateList using useCallback in your hook, so you can include it in the dependency array without causing an infinite loop.

Both methods ensure that when the list state is updated (by calling setList), your SalesList component re-renders and the table is updated as expected.