Javascript 如何将参数从组件传递到redux操作
我试图将国家名称从React组件传递到Redux中的操作,但当它到达操作创建者时,它将变得未定义。我认为这与组件下面的mapDispatchToProps()部分有关,但我对Redux非常陌生,所以我不能完全确定 它从API中获取国家列表ok,但当我想将所选国家返回到Actions.js时,该国家将变得未定义 Component.jsJavascript 如何将参数从组件传递到redux操作,javascript,reactjs,redux,thunk,Javascript,Reactjs,Redux,Thunk,我试图将国家名称从React组件传递到Redux中的操作,但当它到达操作创建者时,它将变得未定义。我认为这与组件下面的mapDispatchToProps()部分有关,但我对Redux非常陌生,所以我不能完全确定 它从API中获取国家列表ok,但当我想将所选国家返回到Actions.js时,该国家将变得未定义 Component.js import React, { useEffect, useState } from "react"; import { connect } from "reac
import React, { useEffect, useState } from "react";
import { connect } from "react-redux";
import {
getCountryCasesAction,
getAllAvailableCountriesAction,
} from "../redux/Actions";
import { Form } from "semantic-ui-react";
function CasesByCountry({
countryOptions,
getAllAvailableCountries,
getCountryCases,
}) {
useEffect(() => {
getAllAvailableCountries();
}, [getAllAvailableCountries]);
const onDropdownOptionSelect = (e, result, country, countryData) => {
console.log(result.value);
getCountryCases(result.value);
};
return (
<div>
<Form.Dropdown
placeholder="Select Country"
fluid
selection
search
onChange={onDropdownOptionSelect}
options={
countryOptions &&
countryOptions.map((c) => {
return {
key: c.ISO2,
text: c.Country,
value: c.Country,
};
})
}
/>
</div>
);
}
const mapStateToProps = (state) => {
return {
countryOptions: state.data,
countryData: state.data,
};
};
const mapDispatchToProps = {
getAllAvailableCountries: getAllAvailableCountriesAction,
getCountryCases: getCountryCasesAction,
};
export default connect(mapStateToProps, mapDispatchToProps)(CasesByCountry);
Reducer.js
import {
GET_WORLDWIDE_SUMMARY,
GET_ALL_AVAILABLE_COUNTRIES,
GET_COUNTRY_CASES,
} from "./Actions";
const initialState = {
data: "",
};
export const rootReducer = (state = initialState, action) => {
switch (action.type) {
case GET_WORLDWIDE_SUMMARY:
console.log(action.payload);
return {
...state,
data: action.payload,
};
case GET_ALL_AVAILABLE_COUNTRIES:
console.log(action.payload);
return {
...state,
data: action.payload,
};
case GET_COUNTRY_CASES:
console.log(action.payload);
return {
...state,
data: action.payload,
};
default:
return state;
}
};
你能试着这样做吗
//actions.js
导出常量getCountryCasesAction=(国家)=>async(
派遣,
getState
) => {
const response=等待axios.get(
`https://api.covid19api.com/dayone/country/${country}/状态/已确认`
);
console.log(“CountryCaseAction”,响应);
退货({
类型:获取国家/地区案例,
有效载荷:response.data,
});
};
//CasesByCountry.js
从“React”导入React,{useffect};
从“react redux”导入{useDispatch,useSelector};
进口{
getCountryCasesAction,
获取所有可用国家信息,
}来自“./redux/Actions”;
从“语义ui反应”导入{Form};
函数CasesByCountry(){
const dispatch=usedpatch();
const availableCountries=useSelector((状态)=>state.availableCountries);
const countryCases=useSelector((state)=>state.countryCases);
useffect(()=>{
调度(getAllAvailableCountriesAction());
},[发送];
国家/地区的常量选项=
可用国家&&
可用国家/地区地图((国家/地区)=>{
返回{
关键字:country.ISO2,
文本:国家,国家,
价值观:国家,国家,
};
});
控制台日志(countryCases);
返回(
调度(getCountryCasesAction(e.value))}
选项={optionForCountries}
/>
);
}
导出默认案例b国家;
//reducer.js
进口{
获取世界各地的信息摘要,
获取所有可用的国家/地区,
获取国家/地区案例,
}来自“/行动”;
常量初始状态={
数据:“,
可用国家:“,
国家案例:“,
};
export const rootReducer=(state=initialState,action)=>{
开关(动作类型){
案例全球获取\u摘要:
返回{
……国家,
数据:action.payload,
};
案例获取所有可用国家/地区:
返回{
……国家,
可用国家/地区:action.payload,
};
案例获取\国家\案例:
返回{
……国家,
countryCases:action.payload,
};
违约:
返回状态;
}
};
您似乎以错误的方式进入country property
我在CaseByCountry.js文件中做了一些更改
...
return (
<div>
<Form.Dropdown
placeholder="Select Country"
fluid
selection
search
onChange={(result, e) => getCountryCases(e.value)}
//{(result) => dispatch(getCountryCases(result.value))}
options={
countryOptions &&
countryOptions.map((c) => {
return {
key: c.ISO2,
text: c.Country,
value: c.Country,
};
})
}
/>
</div>
);
}
...
const mapDispatchToProps = (dispatch) => ({
getAllAvailableCountries: () => dispatch(getAllAvailableCountriesAction),
getCountryCases: country => dispatch(getCountryCasesAction(country)),
});
国家不再是未定义的。但是出现了一个新的错误。由于这不在问题的范围之内,我就不提了
请注意,我只复制了我所做更改的部分。console.log(响应)的结果是什么inside
getCountryCasesAction()
?它记录了我从下拉菜单中选择的国家,这就是我想要传递给Actions的内容。js请告诉我解决方案是否有效。好的,谢谢,我想你技术上回答了这个问题。祝你好运。评论不是用来讨论的;这段对话已经结束。
...
return (
<div>
<Form.Dropdown
placeholder="Select Country"
fluid
selection
search
onChange={(result, e) => getCountryCases(e.value)}
//{(result) => dispatch(getCountryCases(result.value))}
options={
countryOptions &&
countryOptions.map((c) => {
return {
key: c.ISO2,
text: c.Country,
value: c.Country,
};
})
}
/>
</div>
);
}
...
const mapDispatchToProps = (dispatch) => ({
getAllAvailableCountries: () => dispatch(getAllAvailableCountriesAction),
getCountryCases: country => dispatch(getCountryCasesAction(country)),
});
export const getCountryCasesAction = (country) => async (
dispatch,
getState
) => {
console.log("getCountryCasesAction", country);
const response = await axios.get(
`https://api.covid19api.com/dayone/country/${country}/status/confirmed`
);
console.log(response);
return dispatch({
type: GET_COUNTRY_CASES,
payload: response.data,
});
};