Penerokaan aplikasi API Konteks

Question

Saya telah mencuba pelbagai kaedah. Selepas membaca banyak penyelesaian di atas, saya masih belum dapat menyelesaikan masalah ini. Bolehkah sesiapa membantu saya menggunakan konteks dalam projek saya?

SearchContext.jsx

import { createContext } from 'react';

const SearchContext = createContext();

export default SearchContext;

Search.jsx

import * as React from 'react';
import { useState, useContext } from 'react';
import Paper from '@mui/material/Paper';
import AccountCircleIcon from '@mui/icons-material/AccountCircle';
import SearchIcon from '@mui/icons-material/Search';
import { Box, IconButton, InputBase } from '@mui/material';
import SearchContext from '../Context/SearchContext';

export default function Search() {
    const [searchQuery, setSearchQuery] = useState('');
    const handleSubmit = (event) => {
        event.preventDefault();
    };

    const handleInputChange = (event) => {
        setSearchQuery(event.target.value);
    };
    return (
        <SearchContext.Provider value={searchQuery} >
            <Box display='flex' alignItems='center' justifyContent='center' paddingTop='20px'>
                <Paper component="form" sx={{ p: '2px 10px', display: 'flex', width: '50%' }} onSubmit={handleSubmit}>
                    <IconButton type="button" sx={{ p: '10px' }} aria-label="search">
                        <AccountCircleIcon fontSize='large' />
                    </IconButton>
                    <InputBase
                        sx={{ ml: 1, flex: 1 }}
                        placeholder="Search User"
                        inputProps={{ 'aria-label': 'search user' }}
                        onChange={handleInputChange}
                    />
                    <IconButton type="submit" sx={{ p: '10px' }} aria-label="search">
                        <SearchIcon fontSize='large' />
                    </IconButton>
                </Paper>
            </Box>
        </SearchContext.Provider>
    );
}

Itu yang saya gunakan. betul ke? Saya kemudian menggunakannya di sini

import React, { useContext, useEffect, useState } from 'react';
import { ApiService } from '../../API/ApiService';
import SearchContext from '../../Context/SearchContext';


function NumberOfContestParticipated({ handle }) {
    const [contestCount, setContestCount] = useState(null);
    const searchQuery = useContext(SearchContext);
    console.log(searchQuery);
    useEffect(() => {
        const fetchData = async () => {
            const ratingUrl = `https://codeforces.com/api/user.rating?handle=${handle}`;
            const ratingData = await ApiService(ratingUrl);

            if (ratingData && ratingData.status === 'OK') {
                setContestCount(ratingData.result.length);
            } else {
                setContestCount(0);
            }
        };

        fetchData();
    }, [handle]);

    return (
        <div>
            {contestCount !== null ? (
                <p>Number of contests participated by {handle}: {contestCount}</p>
            ) : (
                <p>Loading...</p>
            )}
        </div>
    );
}

export default NumberOfContestParticipated;

Tetapi apabila saya konsol log searchQuery ia memberikan nilai yang tidak ditentukan. Apa yang saya buat salah?

Index.js

import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';
import App from './App';
import SearchContext from './Context/SearchContext';

ReactDOM.render(
  <SearchContext.Provider>
    <App />
  </SearchContext.Provider>
  , document.getElementById('root')
);

Answer 1

Saya rasa masalah anda adalah dengan komponen NumberOfContestParticipated 组件不是 Provider 组件的子组件，因此当状态更改时上下文仍然未定义。另外，我觉得很奇怪，您将应用程序包装在提供程序中两次，如果您包装整个 App, anda tidak perlu melakukan ini.

Lihat artikel ini untuk mendapatkan maklumat lanjut tentang cara menggunakan konteks.