我正在尝试将某个值从组件传递给使用axios执行get请求的动作创建者。我试图遵循Dan Abramov的这种模式:
export const SOME_ACTION = 'SOME_ACTION';
export function someAction() {
return (dispatch, getState) => {
const {items} = getState().otherReducer;
dispatch(anotherAction(items));
}
}
然而,我无法使其发挥作用。我认为我在两个层面上遇到了麻烦:我的组件和我的动作创建者。有一些帮助会很棒。
我的组件:
const timeR = ({
selectedTimeRange,
timeRange = [],
onTimeChange }) => {
return (
<div>
<div>
Filters:
<div>
Year:
<select
defaultValue={selectedTimeRange}
onChange={onTimeChange}>
<option value="all" >All</option>
{timeRange.map((y, i) =>
<option key={i} value={y}>{y}</option>
)}
</select>
</div>
</div>
</div>
);
}
function mapStateToProps(state) {
var range = ['30daysAgo', '15daysAgo', '7daysAgo'];
return {
selectedTimeRange: state.timeReducer.timerange[0],
timeRange: range
};
};
const mapDispachToProps = (dispatch) => {
return {
onTimeChange: (e) => {dispatch (onSetTimeRange(e.target.value));},
};
};
const TimeRange = connect(mapStateToProps, mapDispachToProps)(timeR);
export default TimeRange;
这个组件给我一个下拉菜单。选择时间范围时,例如'30daysAgo',它会更新我的redux存储状态,以便我可以从我的reducer访问该值。
以下是与我的下拉菜单相关联的操作:
export function onSetTimeRange(timerange) {
return {
type: 'SET_TIME_RANGE',
timerange
}
}
这是处理axios.get的行动:
export const fetchgadata = () => (dispatch) => {
dispatch({
type: 'FETCH_DATA_REQUEST',
isFetching:true,
error:null
});
var VIEW_ID = "ga:80820965";
return axios.get("http://localhost:3000/gadata", {
params: {
id: VIEW_ID
}
}).then(response => {
dispatch({
type: 'FETCH_DATA_SUCCESS',
isFetching: false,
data: response.data.rows.map( ([x, y]) => ({ x, y }) )
});
})
.catch(err => {
dispatch({
type: 'FETCH_DATA_FAILURE',
isFetching:false,
error:err
});
console.error("Failure: ", err);
});
};
我的问题:
如何将这两个动作结合在一起。最后,我希望能够在我的下拉菜单中执行onChange
时,使用从菜单中选择的值作为axios.get请求的参数调用操作。
我觉得我需要嵌套两个动作创作者。我试过这个但是不起作用(终端"fetchgadata" is read-only
错误)
export const SET_TIME_RANGE = 'SET_TIME_RANGE';
export function onSetTimeRange() {
return (dispatch, getState) => {
const {VIEW_ID} = getState().timerange;
dispatch(fetchgadata = (VIEW_ID) => (dispatch) => {
dispatch({
type: 'FETCH_DATA_REQUEST',
isFetching:true,
error:null,
id:VIEW_ID,
});
});
return axios.get("http://localhost:3000/gadata", {
params: {
id: VIEW_ID
}
}).then(response => {
dispatch({
type: 'FETCH_DATA_SUCCESS',
isFetching: false,
data: response.data.rows.map( ([x, y]) => ({ x, y }) )
});
})
.catch(err => {
dispatch({
ype: 'FETCH_DATA_FAILURE',
isFetching:false,
error:err
});
console.error("Failure: ", err);
});
}
}
编辑:
API调用的reducers:
const initialState = {data:null,isFetching: false,error:null};
export const gaData = (state = initialState, action)=>{
switch (action.type) {
case 'FETCH_DATA_REQUEST':
case 'FETCH_DATA_FAILURE':
return { ...state, isFetching: action.isFetching, error: action.error };
case 'FETCH_DATA_SUCCESS':
return Object.assign({}, state, {data: action.data, isFetching: action.isFetching,
error: null });
default:return state;
}
};
下拉列表:
const items = [{timerange: '30daysAgo'},{timerange: '15daysAgo'},{timerange: '7daysAgo'}]
const timeReducer = (state = {
timerange: items
}, action) => {
switch (action.type) {
case 'SET_TIME_RANGE':
console.log(state,action);
return {
...state,
timerange: action.timerange,
};
default:
return state;
}
}
答案 0 :(得分:1)
我在axios.get请求的捕获中看到一个小错误,它显示为ype: FETCH_DATA_FAILURE
。否则,你可以为我添加减速机,我不会在那里看到它吗?如果我理解正确,您需要一个动作来更新两个不同的状态,在这种情况下,您只需调度一个动作并将其添加到两个减速器。真的是最好的证明:
//axios call
axios.get("some route", { some params } )
.then(response => {
dispatch({
type: UPDATE_TWO_THINGS,
payload: some_value
})
}) .... catch, etc
//reducer 1
import { UPDATE_TWO_THINGS } from 'types';
const INITIAL_STATE = { userInfo: '' };
export default function (state = INITIAL_STATE, action) {
switch(action.type) {
case UPDATE_TWO_THINGS:
return {...state, userInfo: payload };
}
return state;
}
//reducer 2
import { UPDATE_TWO_THINGS } from 'types';
const INITIAL_STATE = { businessInfo: '' };
export default function (state = INITIAL_STATE, action) {
switch(action.type) {
case UPDATE_TWO_THINGS:
return {...state, businessInfo: payload };
}
return state;
}
希望这会有所帮助,但如果没有,请告诉我,我会尽我所能让这个与你合作!谢谢你的询问!