Reactjs redux saga在发送单个操作后向新请求发送垃圾邮件
所以,基本上,我有一个动作,在点击按钮时发送。 以下是我的传奇故事:Reactjs redux saga在发送单个操作后向新请求发送垃圾邮件,reactjs,react-native,redux,react-redux,redux-saga,Reactjs,React Native,Redux,React Redux,Redux Saga,所以,基本上,我有一个动作,在点击按钮时发送。 以下是我的传奇故事: import * as TYPES from '../types'; import { call, put, takeLatest} from 'redux-saga/effects'; const url = `someApiUrl`; const api = link => fetch(link, { method: 'GET' }).then(res => res.json()); functi
import * as TYPES from '../types';
import { call, put, takeLatest} from 'redux-saga/effects';
const url = `someApiUrl`;
const api = link => fetch(link, {
method: 'GET'
}).then(res => res.json());
function* callingAPItoFetchNews (action) {
try {
const response = yield call(api, url);
yield put({type: TYPES.FETCH_NEWS, payload: response});
} catch (e) {
yield put({type: TYPES.FETCH_NEW_FAILED});
}
}
export default function* watcherSaga () {
yield takeLatest(TYPES.FETCH_NEWS, callingAPItoFetchNews)
}
这是我的根传奇:
import { takeEvery, all, takeLatest, fork } from 'redux- saga/effects';
import * as TYPES from '../types';
import callingAPItoFetchNews from '../sagas';
function* mySaga() {
yield all ([
fork(callingAPItoFetchNews)
])
}
export default mySaga;
在调度一个操作之后,我发现每秒钟都会填充一次获取请求。
动作本身看起来就像这样:
export const fetchNews = () => ({type: TYPES.FETCH_NEWS});
以下是我如何检查返回的数据:
componentWillReceiveProps(nextProps) {
console.log(nextProps);
if (nextProps.dataLoaded !== undefined) {
const articles = nextProps.dataLoaded.articles;
const totalResults = nextProps.dataLoaded.totalResults;
console.log('-----SEPARATION START-------');
console.log(articles);
console.log('-------SEPARATION END--------')
}
}
以下是我的视图,我将应用程序与redux连接并发送操作:
import React, { Component } from 'react';
import {
View,
Text,
Button,
ScrollView,
TouchableOpacity
} from 'react-native';
import { connect } from 'react-redux'
import { fetchNews } from './actions'
import { Ionicons } from '@expo/vector-icons'
import NavStack from './navigation';
import s from './styles';
class MainView extends React.PureComponent {
componentWillReceiveProps(nextProps) {
if (nextProps.dataLoaded !== undefined) {
const articles = nextProps.dataLoaded.articles;
const totalResults = nextProps.dataLoaded.totalResults;
console.log('-----SEPARATION START-------');
console.log(articles);
console.log('-------SEPARATION END--------')
}
}
render() {
return (
//<NavStack/>
<View style={{
flex: 1,
justifyContent: 'center',
alignItems: 'center'
}}>
<Button
title='Click me to fetch data'
onPress={() => {
this.props.fetchNewsData();
}}
/>
</View>
);
}
}
mapStateToProps = state => ({
dataLoaded: state.fetchNews.news
});
mapDispatchToProps = dispatch => ({
fetchNewsData: () => dispatch(fetchNews())
});
export default connect(mapStateToProps, mapDispatchToProps)(MainView);
import React,{Component}来自'React';
进口{
看法
文本,
按钮
滚动视图,
可触摸不透明度
}从“反应本机”;
从“react redux”导入{connect}
从“./actions”导入{fetchNews}
从“@expo/vector icons”导入{Ionicons}
从“/navigation”导入导航堆栈;
从“./styles”导入s;
类MainView扩展了React.PureComponent{
组件将接收道具(下一步){
如果(nextrops.dataLoaded!==未定义){
const articles=nextrops.dataLoaded.articles;
const totalResults=nextrops.dataLoaded.totalResults;
log('----分离开始-----');
控制台日志(文章);
console.log('----分离结束-----')
}
}
render(){
返回(
//
{
this.props.fetchNewsData();
}}
/>
);
}
}
mapStateToProps=状态=>({
数据加载:state.fetchNews.news
});
mapDispatchToProps=调度=>({
fetchNewsData:()=>dispatch(fetchNews())
});
导出默认连接(MapStateTrops、mapDispatchToProps)(主视图);
您的使用最新的:
takeLatest(TYPES.FETCH_NEWS, callingAPItoFetchNews)
正在对您执行的操作作出反应
:
yield put({type: TYPES.FETCH_NEWS, payload: response});
您应该使用或不同的名称,或者使用take
(并使用循环生成解决方案,以便在第一次处理后捕获事件)
因为上面的代码
您可以看到您的代码采用类型。获取新闻操作并调用api
当您通过这行接收到来自api的响应时,也会调度相同的操作TYPES.FETCH\u NEWS
,这就是问题所在yield put({type:TYPES.FETCH\u NEWS,payload:response})代码>
要用标准方法解决此问题,您应该为api响应使用新的操作类型yieldput({type:TYPES.FETCH\u NEWS\u SUCCESS,payload:response})代码>您如何/在哪里发送您的邮件action@imjared添加的组件
import * as TYPES from '../types';
import { call, put, takeLatest} from 'redux-saga/effects';
const url = `someApiUrl`;
const api = link => fetch(link, {
method: 'GET'
}).then(res => res.json());
function* callingAPItoFetchNews (action) {
try {
const response = yield call(api, url);
yield put({type: TYPES.FETCH_NEWS, payload: response});
} catch (e) {
yield put({type: TYPES.FETCH_NEW_FAILED});
}
}
export default function* watcherSaga () {
yield takeLatest(TYPES.FETCH_NEWS, callingAPItoFetchNews)
}