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react redux实现查询

2026-01-27 17:21:16React

redux 查询实现方案

在 React 项目中结合 Redux 实现查询功能，需要建立完整的 Redux 数据流。以下为关键实现步骤：

创建查询相关的 Action

定义查询相关的 action 类型和创建函数：

// actions.js
export const SEARCH_REQUEST = 'SEARCH_REQUEST';
export const SEARCH_SUCCESS = 'SEARCH_SUCCESS';
export const SEARCH_FAILURE = 'SEARCH_FAILURE';

export const searchRequest = (query) => ({
  type: SEARCH_REQUEST,
  payload: { query }
});

export const searchSuccess = (results) => ({
  type: SEARCH_SUCCESS,
  payload: { results }
});

export const searchFailure = (error) => ({
  type: SEARCH_FAILURE,
  payload: { error }
});

创建查询 Reducer

处理查询状态变化的 reducer：

// reducer.js
const initialState = {
  loading: false,
  results: [],
  error: null
};

export function searchReducer(state = initialState, action) {
  switch (action.type) {
    case SEARCH_REQUEST:
      return { ...state, loading: true, error: null };
    case SEARCH_SUCCESS:
      return { ...state, loading: false, results: action.payload.results };
    case SEARCH_FAILURE:
      return { ...state, loading: false, error: action.payload.error };
    default:
      return state;
  }
}

实现异步查询逻辑

使用 Redux Thunk 中间件处理异步查询：

// actions.js
export const search = (query) => async (dispatch) => {
  dispatch(searchRequest(query));
  try {
    const response = await fetch(`/api/search?q=${query}`);
    const data = await response.json();
    dispatch(searchSuccess(data.results));
  } catch (error) {
    dispatch(searchFailure(error.message));
  }
};

连接 React 组件

在 React 组件中使用 Redux：

// SearchComponent.js
import React, { useState } from 'react';
import { connect } from 'react-redux';
import { search } from './actions';

function SearchComponent({ search, loading, results, error }) {
  const [query, setQuery] = useState('');

  const handleSubmit = (e) => {
    e.preventDefault();
    search(query);
  };

  return (
    <div>
      <form onSubmit={handleSubmit}>
        <input
          value={query}
          onChange={(e) => setQuery(e.target.value)}
        />
        <button type="submit" disabled={loading}>
          {loading ? 'Searching...' : 'Search'}
        </button>
      </form>

      {error && <div>Error: {error}</div>}

      <ul>
        {results.map((item) => (
          <li key={item.id}>{item.name}</li>
        ))}
      </ul>
    </div>
  );
}

const mapStateToProps = (state) => ({
  loading: state.search.loading,
  results: state.search.results,
  error: state.search.error
});

export default connect(mapStateToProps, { search })(SearchComponent);

配置 Redux Store

创建并配置 Redux store：

// store.js
import { createStore, combineReducers, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
import { searchReducer } from './reducer';

const rootReducer = combineReducers({
  search: searchReducer
});

const store = createStore(rootReducer, applyMiddleware(thunk));

export default store;

性能优化建议

对于频繁的查询操作，可以考虑添加防抖机制：

// 在组件中实现防抖
const debouncedSearch = useMemo(
  () => debounce((query) => search(query), 500),
  [search]
);

useEffect(() => {
  if (query.length > 2) {
    debouncedSearch(query);
  }
}, [query, debouncedSearch]);

测试方案

编写测试用例验证 Redux 查询逻辑：

// reducer.test.js
describe('searchReducer', () => {
  it('should handle SEARCH_REQUEST', () => {
    const newState = searchReducer(initialState, searchRequest('test'));
    expect(newState).toEqual({
      loading: true,
      results: [],
      error: null
    });
  });
});

这种实现方式完整覆盖了 Redux 的数据流，包括 action 触发、状态更新和异步处理，适用于大多数查询场景。

react redux实现查询