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reactjs - 如何使用 reactsj 和 typescript 在 reducer 文件中返回数据？

问题描述

我在 redux 中加载数据时遇到问题，reducer 在调用我的文件时丢失了我的数据，请帮助我。

我的主要 src/index.tsx

import React from 'react'
import {Provider} from 'react-redux'
import ReactDOM from 'react-dom'
import App from './App'
import store from './redux/stores'

ReactDOM.render(
 <Provider store={store}>
    <App />
 </Provider>,
 document.getElementById('root')
)

我的文件获取数据 CampaingHeader

export class CampaingHeader {
private token: any 
private resp_campaing_header: any

constructor(token: any){
    this.token = token
}

/*
   get last campaing for the current user
 */
getLastCampaingHeader = async() => {
    this.resp_campaing_header = await API.get(`campaing-header-last`,{
        headers: {Authorization: `Bearer ${this.token}`}
    })
    return this.resp_campaing_header
 }
}

我在 redux 中的文件

类型

/redux/types/campaing.types.tsx

export const SET_CAMPAING = 'SET_CAMPAING'
export const LOADING_CAMPAING = 'LOADING_CAMPAING'
export const SET_DEFAULT_CAMPAING = 'SET_DEFAULT_CAMPAING'
export const SET_ERRORS = 'SET_ERRORS'

减速器 /redux/reducers/campaing.reducers.tsx 我的问题是这个文件

import {
SET_DEFAULT_CAMPAING,
SET_CAMPAING,
SET_ERRORS
} from '../types/campaing.types'

const InitCampaingState = {
 answer: false,
 campaing: {}, 
 errors: {}
}

export default function(state = InitCampaingState, action: any) {
 // HERE LOAD MY DATA
 console.info(action.payload)
switch (action.type) {

    // BUT HERE NOT LOADED
    case SET_CAMPAING:
        return {
            ...state,
            answer: true,
            campaing: action.payload // ALWAYS payload is undefined
        }

    default:
        return state // AND RETURN STATE
 }
}

我的文件操作 /redux/actions/campaing.actions.tsx

import {
SET_CAMPAING,
SET_ERRORS,
} from '../types/campaing.types'

import {CampaingBody} from '../../userCampaings'


let token = window.sessionStorage.getItem('token')

let CampHeader = new CampaingBody(token)

export const RetrieveCampaing = (campaing_id: number) => (dispatch: any) => {

CampHeader.getRetrieveCBody(campaing_id)
    .then(resp =>{ 

            console.info(resp.data.data)// DATA IS LOADED HERE
            dispatch({
                type: SET_CAMPAING,
                payload: resp.data.data,// HERE LOADED DATA TOO
             })
    }).catch(err =>{
             dispatch({
                type: SET_ERRORS,
                errors: err 
             })
    })
 }

获取campaing ID时的文件，下面的代码运行良好，将ID campaing传递给我上面的/redux/actions/campaing.actions.tsx代码

import React from 'react'
import {connect} from 'react-redux'
// call my actions
import {RetrieveCampaing} from '../../../../redux/actions/campaing.actions' 

const UpdateCampaing: React.FC = (props: any) => {
    React.useEffect(()=>{
     // HERE PASS DATA CORRECTLY
     let ID = GetCampID() 
     props.RetrieveCampaing(ID)
    },[])
    return(....)
}
const mapStateToProps = (state: any) => ({
 campaing: state.campaing
})

const mapActionToProps = {
 RetrieveCampaing   
}
export default connect(mapStateToProps, mapActionToProps)(UpdateCampaing)

当我尝试从操作共享数据时，我的问题就在这里，使用连接不起作用。

import React from 'react'
import {connect} from 'react-redux'
type FormData = {
 profile: Iuser
 first_name: string
 last_name: string
 email: string
 cinit: string
}

interface Icampaing {
 campaing: FormData 
}

const Personal: React.FC<Icampaing> = ({campaing})=>{
  React.useEffect(()=>{
    //MY PROBLEM IS HERE NOT LOAD DATA
    console.info('from redux')
    console.info(campaing) // RETURN DATA InitCampaingState, from my type files
  },[])
}

 return(<div>{campaing.cinit}</div>)
}

const mapStateToProps = (state: any) =>({
 campaing: state.campaing
})

export default connect(mapStateToProps)(Personal)

我的问题在 REDUCER 文件中，因为数据已加载，但不返回数据。

请帮助我，我不知道我的错误在哪里，显然一切正常，我的意思是，将数据加载到 de 动作文件中工作，但是当我将动作调用到 de PERSONAL 文件中时不起作用

最好的词。

标签： reactjstypescriptredux

解决方案

你UseEffect的空数组[]就像componentDidMount，它只被调用一次。

您需要添加campaing到数组，并且您的useEffect钩子将在每次露营道具更改时被调用：

const Personal: React.FC<Icampaing> = ({campaing})=>{
  React.useEffect(()=>{
    //MY PROBLEM IS HERE NOT LOAD DATA
    console.info('from redux')
    console.info(campaing) // RETURN DATA InitCampaingState, from my type files
  },[campaing])
}

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