Reactjs Redux Thunk Action=组件willmount中未定义
我正在尝试从componentWillMount分派一个函数。绑定动作创建者函数fetchDraftAdventures在componentWillMount外部工作,但不在内部工作Reactjs Redux Thunk Action=组件willmount中未定义,reactjs,redux,Reactjs,Redux,我正在尝试从componentWillMount分派一个函数。绑定动作创建者函数fetchDraftAdventures在componentWillMount外部工作,但不在内部工作 componentWillMount() { let {draftAdventures, editableAdventures} = this.props; console.log("this props") this.props.fetchDraftAdventures(1); c
componentWillMount() {
let {draftAdventures, editableAdventures} = this.props;
console.log("this props")
this.props.fetchDraftAdventures(1);
console.log(' adventures props', this.props)
}
应用程序连接
export default withRouter(connect(
state => {
return {
editableAdventures: state.editableAdventures,
draftAdventures: state.draftAdventures,
};
},
dispatch => ({
fetchAdventureEditable: bindActionCreators(fetchAdventureEditable, dispatch),
fetchEditableAdventures: bindActionCreators(fetchEditableAdventures, dispatch),
fetchAdventureDraft: bindActionCreators(fetchAdventureDraft, dispatch),
fetchDraftAdventures: bindActionCreators(fetchDraftAdventures, dispatch),
dispatch
})
)(AdventuresDashboard));
以下是行动本身:
// Constants
import {
GET_DRAFT_ADVENTURES_REQUESTED,
GET_DRAFT_ADVENTURES_SUCCEEDED,
GET_DRAFT_ADVENTURES_REJECTED
} from '../../../constants/Actions'
import {get} from '../../../lib/request';
const DraftAdventures = (args) => {
console.log('draft adventures', args)
const Authorization = localStorage.getItem('authToken');
const pageNumber = args;
const lastIndex = pageNumber.length - 1;
let pageParam = '';
if (pageNumber[lastIndex]) {
pageParam = `?page=${pageNumber[lastIndex]}`
return dispatch => {
dispatch({ type: GET_DRAFT_ADVENTURES_REQUESTED, payload: `Fetching Draft Adventures` })
get(`/draft-adventures/${pageParam}&ordering=-updated_at`, {},
{Authorization})
.then(response => {
if (response) {
if (response.data) {
let page = null;
if (response.data.next !== null) {
page = response.data.next.split('page=')[1];
page = Number(page);
}
dispatch({ type: GET_DRAFT_ADVENTURES_SUCCEEDED, payload: response.data, pageNumber: Number(page)})
} else {
dispatch({ type: GET_DRAFT_ADVENTURES_REJECTED, payload: 'NULL response.data' })
}
} else {
dispatch({ type: GET_DRAFT_ADVENTURES_REJECTED, payload: 'NULL response' })
}
}).catch(error => {
console.log('errorer', error)
dispatch({ type: GET_DRAFT_ADVENTURES_REJECTED, payload: error })
})
}
}
};
export default (DraftAdventures);
对此的响应是以下堆栈跟踪:
据我所知,从thunk中间件传递到路由器中间件的操作是未定义的。在我的fetchDraftAdventure函数中,dispatch({type:GET\u DRAFT\u ADVENTURES\u REQUESTED,payload:'Fetching DRAFT ADVENTURES'})
从未被调用。为什么不呢
另外,我的商店配置文件:
// Libraries
import { createStore, applyMiddleware, compose } from 'redux';
import thunk from 'redux-thunk';
import {logger} from 'redux-logger';
import createHistory from 'history/createBrowserHistory'
import { routerMiddleware } from 'react-router-redux'
// Components
import DevTools from '../devTools/DevTools';
// Reducers
import reducer from '../reducers';
// Config
import reduxLoggerConfig from '../config/reduxLoggerConfig';
//const logger = createLogger(reduxLoggerConfig);
const history = createHistory()
const middlewareRouter = routerMiddleware(history)
const createDevStoreWithMiddleware = compose(
applyMiddleware(thunk, middlewareRouter, logger),
DevTools.instrument()
)(createStore);
console.log('createDev store', createDevStoreWithMiddleware(reducer))
export default function configureStore() {
var store = createDevStoreWithMiddleware(reducer);
// enable webpack hot module replacement for reducers
if (module.hot && process.env.BUILD_TARGET === 'local') {
module.hot.accept('../reducers/index.js', () => {
const nextRootReducer = require('../reducers');
store.replaceReducer(nextRootReducer);
});
}
return store;
}
我想问题在于你的“砰”声 这不是
thunk
签名,您没有返回函数
更改为:
const DraftAdventures = (args) => ({dispatch}) => {...
redux thunk
检查对象是否为typeof
函数
您的返回在
if
语句中。如果此条件不成立:如果(pageNumber[lastIndex])
,则您的操作创建者DraftAdventures
不会返回任何内容(例如,它返回未定义的
。Redux尝试调度此未定义的操作,您会得到错误
动作创建者(DraftAdventures
在本例中)需要始终返回一个动作。该动作可以是一个简单的对象,也可以是一个thunk(又称函数),或者是您安装了redux中间件来处理的其他动作
你的action creator有时返回thunk(好!),有时返回undefined(坏!)伙计,我完全忘了我应该传入一个数组参数,我的if语句失败了,因为我传入的是
1
,而不是[1]
。你指的是if语句完全修复了它。非常感谢!