Redux 不会一次向商店发送 2 个属性

Question

我是 Redux 新手。我有一个具有 2 个属性的初始状态的减速器。

我从一个组件向存储发送数据，但只传送了一个属性 - 时间或日期。但我需要同时发送。

我试着做 async/await 认为解释器只是用完了时间 - 尽管它不那么合乎逻辑，但我试过了。它对我没有帮助。我还认为 Redux 不能接受对象，但我研究发现它可以。然后我向自己证明它确实可以——我只是简单地只发送了 1 属性.

代码片段如下。

*Reducer: *

const initialState = {
  date: {},
  time: {}
}

const dateTimeReducer = (state = initialState, action) => {
    switch (action.type) {
        case 'setDate':
            return {
                date: action.payload,
            }

        case 'setPickedCell':
            return {
                time: action.payload,
            }

        default:
            return state
    }
}
export default dateTimeReducer

*index.js*

import React from 'react'
import ReactDOM from 'react-dom'
import './css/style.comp.css'
import App from './App'
import { BrowserRouter } from 'react-router-dom'
import store from './redux/store'
import { Provider } from 'react-redux'
// import rootReducer from './redux/rootReducer'

// const store = createStore(rootReducer)

ReactDOM.render(
    <Provider store={store}>
        <BrowserRouter>
            <App />
        </BrowserRouter>
    </Provider>,

    document.getElementById('root')
)

*store.js*

import { createStore } from 'redux'
import rootReducer from './rootReducer'

const store = createStore(rootReducer)

export default store

*rootReducer.js*

import { combineReducers } from 'redux'
import dateTime from './reducers/dateTime'

export default combineReducers({ dateTime })

*Component - I will simplify, with a condition that I have no syntax mistakes and the code works when I send only 1 of 2 properties to a Redux store*

import Date from ''
import Time from ''

class Comp extends React.Component {
  state = {
     date: {...}, 
     time: {...} // both date and time already set during rendering cycle - through a function 
                 // acceptStateFromDate and acceptStateFromTime
  }

  acceptStateFromDate() {
    this.setState({ date: stateData })
  } 

  // same about acceptStateFromTime - those functions are used to get state data from a child component and are called while componentDidMount

  acceptStateFromTime() {
    ...
  }

  onConfirmClick = () => {
    this.props.isAllowedHandler()
    this.props.onDateSet(this.state.datePicker)
    this.props.onCellSet(this.state.timePicker)
  }

  componentDidMount() {
    acceptStateFromDate() 
    acceptStateFromTime()
  } 

  render() {
    return (
      <div> 
        <div onClick={this.onConfirmClick}> Confirm </div>
        <Time sendState={acceptStateFromTime} />
        <Date sendState={acceptStateFromDate} />
    )
  }
}

function mapStateToProps(state) {
    return {
        date: state.dateTime.date,
        time: state.dateTime.time,
    }
}

function mapDispatchToProps(dispatch) {
    return {
        onDateSet: (val) => dispatch({ type: 'setDate', payload: val }),
        onCellSet: (val) => dispatch({ type: 'setPickedCell', payload: val }),
    }
}

export default connect(mapStateToProps, mapDispatchToProps)(withRouter(Appointment))

我的代码中存在所有导出和导入。

因此，如果我仅通过 onConfirmClick 发送 this.props.onDateSet({someObj})```, I will get in my Redux state 日期：{someObj}. Same about time - I will get 时间：{someObj}````。

但如果我把这 2 个道具放在一起，只有一个会送到商店。

我想问题比逻辑更深，可能是我在 React 系统或 Redux 方面不够好。

有谁知道问题出在哪里？

提前致谢！

Answer 1

你的减速器是错误的，你也必须 return state。目前你正在完全重写它：

return {
  date: action.payload,
}

将您的 return 语句更改为以下内容：

return {
  ...state,
  date: action.payload,
}

const dateTimeReducer = (state = initialState, action) => {
  switch (action.type) {
    case 'setDate':
      return {
        ...state,
        date: action.payload,
      }
    case 'setPickedCell':
      return {
        ...state,
        time: action.payload,
      }
    default:
      return state
  }
}

Redux 不会一次向商店发送 2 个属性

Redux does not send to the store 2 properties at a time

javascript

reactjs

redux

react-redux

react-state