【发布时间】:2016-08-30 06:52:30
【问题描述】:
下面作为动作创建者的第一个块与 thunk 一样工作,但我还想应用第二个块,它是一个承诺中间件。如何调整它以便它可以调度 2 个动作?
export const fetchPokemon = function (pokemonName) {
return function (dispatch) {
dispatch({type: 'REQUESTING'})
const requestURL = `http://pokeapi.co/api/v2/pokemon/${pokemonName}/`
return fetch(requestURL)
.then(function (response) {
return response.json()
})
.then(function (data) {
dispatch(receivePokemon(formatPokemonData(data)))
dispatch(fetchPokemonDescription(pokemonName))
})
}
}
中间件
const fetchPromiseMiddleware = store => next => action => {
if (typeof action.then !== 'function') {
return next(action)
}
return Promise.resolve(action).then(function (res) {
if (res.status >= 400) {
throw new Error("Bad response from server")
}
return res.json()
}).then(store.dispatch)
}
我尝试了以下方法,但出现错误:
store.js:33 Uncaught (in promise) TypeError: (0 , _actionCreators.receivePokemon) 不是函数
const fetchPromiseMiddleware = store => next => action => {
if (typeof action.then !== 'function') {
return next(action)
}
return Promise.resolve(action).then(function (res) {
if (res.status >= 400) {
throw new Error("Bad response from server")
}
return res.json()
}).then(function (data) {
return store.dispatch(receivePokemon(formatPokemonData(data)))
}).then(function (data) {
return store.dispatch(fetchPokemonDescription(data.name))
})
}
【问题讨论】:
-
你能展示你剩下的动作吗?
标签: javascript reactjs redux middleware react-redux