Javascript Redux thunk:API响应一直挂起
我正在尝试开发一个应用程序,即在给定关键字的情况下显示来自Unsplash的照片。我设法使用unsplash.js获取特定的照片。在我的动作中,我有几个动作创建者:Javascript Redux thunk:API响应一直挂起,javascript,redux,redux-thunk,Javascript,Redux,Redux Thunk,我正在尝试开发一个应用程序,即在给定关键字的情况下显示来自Unsplash的照片。我设法使用unsplash.js获取特定的照片。在我的动作中,我有几个动作创建者: export const fetchPhotos = () => ({ type: FETCH_PHOTOS }); export const receivePhotos = term => { const unsplash = new Unsplash({ applicationId: "
export const fetchPhotos = () => ({
type: FETCH_PHOTOS
});
export const receivePhotos = term => {
const unsplash = new Unsplash({
applicationId:
"id",
secret: "secret",
callbackUrl: "callback"
});
console.log(term);
const response = unsplash.search
.photos(term, 1, 20)
.then(toJson)
.then(json => json)
.then(json => json)
console.log(response.then(results => results));
return {
type: RECEIVE_PHOTOS,
payload: response
};
}
export const unsplash = (term) => dispatch => {
console.log(term);
dispatch(fetchPhotos());
setTimeout(() => {
dispatch(receivePhotos(term));
console.log("dispatching")
return Promise.resolve();
}, 1000)
}
然后,我的减速器执行以下操作:
const initialState = {
isFetching: false,
sortDirection: null,
sortKey: null,
items: []
}
export default function(state = initialState, action) {
switch (action.type) {
case FETCH_PHOTOS:
console.log(state, "Fetch photos reducer");
return {
...state,
isFetching: true
};
case RECEIVE_PHOTOS:
console.log("Receive photos reducer", action.payload)
return {
...state,
isFetching: false,
items: action.payload
};
case SET_SORT:
return {
...state,
sortKey: action.sortKey,
sortDirection: action.sortDirection
};
default:
return state;
}
}
然而,当receivePhotos操作创建者调用API时,我有一个承诺需要解决,以使整个应用程序正常工作。我的fetch photos reducer正在控制台记录操作,然后承诺出现,但它始终处于挂起状态。然后我的receivePhotos action creator发送到reducer,我可以看到这是一个承诺:
如何解决此承诺?在下面的代码中,您将承诺分配给
响应
,然后控制台。记录该承诺,然后将有效负载设置为该承诺返回操作
const response = unsplash.search
.photos(term, 1, 20)
.then(toJson)
.then(json => json)
.then(json => json)
console.log(response.then(results => results));
return {
type: RECEIVE_PHOTOS,
payload: response
};
发送(接收照片(期限))代码>然后分派该操作,仍然将有效负载作为承诺。如果您有可以处理它的中间件,也许这会起作用
使用dispatch表明您正在使用redux thunk。
在这种情况下,您应该对receivePhotos
执行相同的操作,包括fetchPhotos
调用,并取消unflash
操作
const unsplashClient = new Unsplash({
applicationId:
"id",
secret: "secret",
callbackUrl: "callback"
});
export const receivePhotos = term => dispatch => {
dispatch(fetchPhotos());
return unsplashClient.search
.photos(term, 1, 20)
.then(toJson)
.then(json => dispatch({
type: RECEIVE_PHOTOS,
payload: json
});
}
最后,我建议对操作和(相关的简化程序)进行一些重构,例如:
在下面的代码中,您将承诺分配给响应
,然后控制台。记录该承诺,然后将有效负载
设置为该承诺的操作返回
const response = unsplash.search
.photos(term, 1, 20)
.then(toJson)
.then(json => json)
.then(json => json)
console.log(response.then(results => results));
return {
type: RECEIVE_PHOTOS,
payload: response
};
发送(接收照片(期限))代码>然后分派该操作,仍然将有效负载作为承诺。如果您有可以处理它的中间件,也许这会起作用
使用dispatch表明您正在使用redux thunk。
在这种情况下,您应该对receivePhotos
执行相同的操作,包括fetchPhotos
调用,并取消unflash
操作
const unsplashClient = new Unsplash({
applicationId:
"id",
secret: "secret",
callbackUrl: "callback"
});
export const receivePhotos = term => dispatch => {
dispatch(fetchPhotos());
return unsplashClient.search
.photos(term, 1, 20)
.then(toJson)
.then(json => dispatch({
type: RECEIVE_PHOTOS,
payload: json
});
}
最后,我建议对操作和(相关的简化程序)进行一些重构,例如: