Reactjs 在redux中更新状态
我是新来redux的,大多数事情都有点模糊。例如在redux中更新状态 考虑到这一点,我有一个称为websocket的容器Reactjs 在redux中更新状态,reactjs,redux,Reactjs,Redux,我是新来redux的,大多数事情都有点模糊。例如在redux中更新状态 考虑到这一点,我有一个称为websocket的容器 componentDidUpdate() { var socket = openSocket('https://coincap.io'); var updateCoinData = [...this.props.cryptoLoaded]; // socket.on('trades', (tradeMsg) => { for
componentDidUpdate() {
var socket = openSocket('https://coincap.io');
var updateCoinData = [...this.props.cryptoLoaded]; //
socket.on('trades', (tradeMsg) => {
for (let i=0; i<updateCoinData.length; i++) {
if (updateCoinData[i]["short"] == tradeMsg.coin ) {
//Search for changed Crypto Value
updateCoinData[i]['price'] = tradeMsg['message']['msg']['price']
//Update the crypto Value state in Redux
}
}
})
}
fetch coin中的数据正在通过操作传递
import axios from 'axios';
import {CRYPTO_FETCHING, CRYPTO_DATA_FAIL, CRYPTO_FETCH_SUCESS, UPDATE_CRYPTO_DATA} from './type.js';
import {ApiCoinCap} from '../urls.js';
export const fetchCoin = () => {
return function (dispatch) {
dispatch({type: CRYPTO_FETCHING})
axios.get(ApiCoinCap).then((response) => dispatch({
type: CRYPTO_FETCH_SUCESS,
payload: response.data
})).catch(error => dispatch({
type: CRYPTO_DATA_FAIL,
payload: error.data
}))
}
}
[问题]:如何发送操作以更新状态
[更新:]以下是我的减速机的外观
import {CRYPTO_FETCHING, CRYPTO_DATA_FAIL, CRYPTO_FETCH_SUCESS} from './../actions/type.js';
const initialState = {
itemsSomething : [],
itemsSucess: [],
itemsFail: []
}
export default function(state = initialState, action) {
switch(action.type) {
case CRYPTO_FETCHING:
return {
...state,
itemsSomething: action.payload
}
case CRYPTO_FETCH_SUCESS:
return {
...state,
itemsSucess: action.payload
}
case CRYPTO_DATA_FAIL:
return {
...state,
itemsFail: action.payload
}
default:
return state
}
}
我后来通过这样做结合起来
import { combineReducers } from 'redux';
import postReducer from './postreducer';
const rootreducer = combineReducers({
posts: postReducer
})
export default rootreducer
function mapDispatchToProps (dispatch) {
return {
crypto_success: (res) => dispatch(ACTIONS.set_crypto(res)),
}
}
[Re:Question]如何更新Redux中的现有状态?i、 e我的websocket发送我要在此处更新的数据
case CRYPTO_FETCH_SUCESS:
return {
...state,
itemsSucess: action.payload
}
[问题]:如何发送操作以更新状态 您可以使用react-redux库中的mapDispatchToProps函数执行此操作,还需要redux-thunk库中的异步操作创建者 您的mapDispatchToProps函数将如下所示
import { combineReducers } from 'redux';
import postReducer from './postreducer';
const rootreducer = combineReducers({
posts: postReducer
})
export default rootreducer
function mapDispatchToProps (dispatch) {
return {
crypto_success: (res) => dispatch(ACTIONS.set_crypto(res)),
}
}
ACTIONS.set_crypto()将是您必须在操作文件中定义的redux thunk,然后在此处导入该函数。差不多
import * as ACTIONS from **Location of your actions file**
您的axios get请求应该是
axios.get(ApiCoinCap)
.then(res => this.props.crypto_success(res.data))
最后,动作创建者将是这样的
export function set_crypto(data) {
return dispatch => {
dispatch({type: ACTION_TYPES.CRYPTO_FETCH_SUCESS, payload: data})
}
}
您还需要修改root index.js文件,以便像这样使用redux thunk
import { Provider } from 'react-redux';
import rootReducer from './store/reducers/index';
import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';
let store = createStore(
rootReducer,
applyMiddleware(thunk)
)
ReactDOM.render(<Provider store={store}>
<App />
</Provider>,
document.getElementById('root'));
从'react redux'导入{Provider};
从“./store/reducers/index”导入rootReducer;
从“redux”导入{createStore,applyMiddleware};
从“redux thunk”导入thunk;
let store=createStore(
减根剂,
applyMiddleware(thunk)
)
ReactDOM.render(
,
document.getElementById('root');
现在,您应该能够将axios调用的数据保存到redux