Reactjs Redux thunk不会使用异步函数的响应进行更新
我一直在遵循安装redux thunk的指南,以便获取用户的地理位置,然后发送和更新状态。但是,每次我尝试使用响应数据分派操作时,它只是将数据设置为null 当我尝试模拟一个带超时的API调用并设置一些随机值时,它可以正常工作 geoLocationActions.jsReactjs Redux thunk不会使用异步函数的响应进行更新,reactjs,redux,geolocation,react-redux,redux-thunk,Reactjs,Redux,Geolocation,React Redux,Redux Thunk,我一直在遵循安装redux thunk的指南,以便获取用户的地理位置,然后发送和更新状态。但是,每次我尝试使用响应数据分派操作时,它只是将数据设置为null 当我尝试模拟一个带超时的API调用并设置一些随机值时,它可以正常工作 geoLocationActions.js export function geoLocationActions() { return dispatch => { const geolocation = navigator.geolocation;
export function geoLocationActions() {
return dispatch => {
const geolocation = navigator.geolocation;
geolocation.getCurrentPosition((position) => {
console.log(position.coords);
dispatch({
type: 'FETCH_USER_LOCATION_SUCCESS',
payload: position
});
});
}
};
MapContainer.js
import React from "react";
import { geoLocationActions } from '../../../actions/geoLocationActions';
import { connect } from 'react-redux';
class MapContainer extends React.Component {
componentWillMount() {
this.props.geoLocationActions();
}
render() {
return (
<div>
<p>Fetching location...</p>
</div>
);
}
}
// update current geolocation state
const mapDispatchToProps = (dispatch) => {
return {
geoLocationActions: () => dispatch(geoLocationActions())
};
}
const mapStateToProps = (state) => {
return {
state: state
};
};
export default connect(mapStateToProps, mapDispatchToProps)(MapContainer);
store.js
import { createStore, combineReducers, applyMiddleware, compose } from
'redux';
import reducer from '../reducers/reducers';
import reduxThunk from "redux-thunk";
const rootReducer = combineReducers({
state: reducer
});
export const store = createStore(
rootReducer,
compose(
applyMiddleware(reduxThunk),
window.devToolsExtension ? window.devToolsExtension() : f => f
)
);
它将变成HTML5地理位置对象。您需要将其转换为可以用JSON.stringify序列化的常规对象。 您可以使用以下方法:
const geopositionToObject = geoposition => ({
timestamp: geoposition.timestamp,
coords: {
accuracy: geoposition.coords.accuracy,
latitude: geoposition.coords.latitude,
longitude: geoposition.coords.longitude
}
})
更新您的geoLocationActions.js,如下所示:
export function geoLocationActions() {
return dispatch => {
const geolocation = navigator.geolocation;
geolocation.getCurrentPosition((position) => {
const positionObj = geopositionToObject(position)
console.log(positionObj);
dispatch({
type: 'FETCH_USER_LOCATION_SUCCESS',
payload: positionObj
});
});
}
};
您可以查看相同的代码。它将变成HTML5地理位置对象。您需要将其转换为可以用JSON.stringify序列化的常规对象。 您可以使用以下方法:
const geopositionToObject = geoposition => ({
timestamp: geoposition.timestamp,
coords: {
accuracy: geoposition.coords.accuracy,
latitude: geoposition.coords.latitude,
longitude: geoposition.coords.longitude
}
})
更新您的geoLocationActions.js,如下所示:
export function geoLocationActions() {
return dispatch => {
const geolocation = navigator.geolocation;
geolocation.getCurrentPosition((position) => {
const positionObj = geopositionToObject(position)
console.log(positionObj);
dispatch({
type: 'FETCH_USER_LOCATION_SUCCESS',
payload: positionObj
});
});
}
};
您可以查看以查看相同的代码。您是否看到
console.log(position.coords)代码>在您的控制台中?是!确实如此,这就是为什么我觉得这很奇怪的原因。在减速机中抛出一个console.log()
。这叫什么?接下来,在渲染函数中添加console.log(this.props)
,是否调用了该函数?是否看到console.log(position.coords)代码>在您的控制台中?是!确实如此,这就是为什么我觉得这很奇怪的原因。在减速机中抛出一个console.log()
。这叫什么?接下来,在渲染函数中添加一个console.log(this.props)
,是否调用该函数?