redux

What “…” means in Javascript (ES6)? [duplicate]

由 对着背影说爱祢 提交于 2020-01-10 19:50:46
问题 This question already has answers here : What do these three dots in React do? (23 answers) Closed 2 years ago . I am learning Redux, React and ES6. I already developed with JS, but this new world of ES6 are surprising me with a lot of new things like "=>" to declare arrow functions and other. However, in this new Redux studies, I confront with ... in middle of my code. Bellow I have an example: import { combineReducers, createStore } from 'redux' const userReducer = (state={}, action) => {

How to initialize default data in ES5 Redux reducer?

由 女生的网名这么多〃 提交于 2020-01-10 19:43:32
问题 For the time being I can't use ES6/ES2015 and I'm stuck with ES5 for writing Redux reducers. Since the state parameter of a reducer has to be immutable, even when it's undefined, I came up with the following pattern: function myState( state, action ) { if ( typeof state === 'undefined' ) { return myState( { value1: 'foo', value2: 'bar' }, action ); } // actual state calculation here } Any alternative suggestions or comments on how to ensure a default value with ES5? Edit: After some questions

react redux使用 基础搭建过程

由 旧街凉风 提交于 2020-01-10 19:32:37
首先说明搭建redux需要的插件 react-redux redux 安装了必要的插件之后进行文件配置 需要搭建的文件如下 src actions 　|　index.js　　　　用于汇总 　|　counter.js　　　 reducers 　|　index.js　　　　用于汇总 　|　redux.js 需要进行更改的文件 及具体更改内容 src文件下的index.js 引入 import { Provider } from 'react-redux'; import { createStore } from 'redux' import rootReducer from './reducers' 这个就是你那个文件夹 创建库 const store = createStore(rootReducer) 把你的整个文件夹拉过来建立一个库 更改class render里面的内容 <Provider store={store}> 用Provider包裹住App/这个组件 并且把store传过去 <div><App/></div> </Provider> 底下不要忘了改这个组件名 ReactDOM.render(<Hello />, document.getElementById('root')); action文件下 非index.js文件

How to handle errors in fetch() responses with Redux Thunk?

由 淺唱寂寞╮ 提交于 2020-01-10 07:43:53
问题 I'm making API requests using isomorphic fetch, and using Redux to handle my app's state. I want to handle both internet connection loss errors, and API errors, by firing off Redux actions. I have the following (work-in-progress / bad) code, but can't figure out the correct way to fire the Redux actions (rather than just throw an error and stop everything) : export function createPost(data = {}) { return dispatch => { dispatch(requestCreatePost(data)) return fetch(API_URL + data.type, {

Why do we need to export the connect method for it to work?

由 岁酱吖の 提交于 2020-01-10 03:17:05
问题 If i try to connect a component without exporting directly it fails to connect. Example: connect(mapstatetoprops, mapdispatchtoprops)(Componentx); export default Componentx; Why should this make any difference? 回答1: connect doesn't do anything to the original component, rather it is the implementation of the High Order Component pattern: so it that takes a React component as an argument and returns another component by the performing the actions it need to do like providing the action

react学习的一些网站

由 人走茶凉 提交于 2020-01-10 01:33:58
代码部分 npm依赖下载 EJS模板语言 typescript学习资源合集 typescript完全解读 typescript手册中文版 语义化版本2.0 前端面试题合集 jsdom学习 ECMAscript w3c标准 redux+react示例 redux 原生手写弹出框示例 d3教程 web响应式开发 meterial design 测试部分 mocha chai enzyme typemoq 来源： CSDN 作者： 菜鸟小佳 链接： https://blog.csdn.net/weixin_42429288/article/details/103908615

Redux Many to Many Relationship

由 拈花ヽ惹草 提交于 2020-01-09 11:45:10
问题 I'm trying to figure out a good structure to create a many to many relationship in Redux. For this example we have images (which can have multiple tags) and tags (which can have multiple images). Is this a good way to structure it in Redux? images: { 1: { title: "A bunch of hills" }, 2: { title: "Hiking in a forest" } }, tags: { 1: { title: "landscape" }, 2: { title: "outdoors" } }, imagesTags: { [ image: 1, tag: 1 ], [ image: 1, tag: 2 ], [ image: 2, tag: 2 ] } It does mean I have to create

redux样板代码简化写法

由 余生长醉 提交于 2020-01-09 00:05:49
直接使用redux，要写很多样板代码，大量的actiontype，actionCreator。 一个异步的方法要写三个actiontype，三个actionCreator，十分繁琐。 下面是本人使用的一种简化写法，使用数组动态生成一些action和actionCreator，具有参考价值。 action-type.js export const asynctypes = [ 'getCateList', 'getArticleList', 'searchArticles', 'getArticleDetail', ] export const synctypes = [ '@@router/LOCATION_CHANGE' ] export const types = {}; asynctypes.forEach(item => { types[item + '.start'] = item + '.start'; types[item + '.ok'] = item + '.ok'; types[item + '.error'] = item + '.error'; }); synctypes.forEach(item => { types[item] = item; }); synctypes生成同步的actiontype，asynctypes生成异步的actiontype

How does connect work without mapDispatchToProps

由 我的梦境 提交于 2020-01-08 14:42:34
问题 I was reading the example docs for redux and I found this example of a container component. Can someone explain why in this case mapDispatchToProps is not needed here. As well, how is the function getting the dispatch function? import React from 'react' import { connect } from 'react-redux' import { addTodo } from '../actions' let AddTodo = ({ dispatch }) => { let input return ( <div> <form onSubmit={e => { e.preventDefault() if (!input.value.trim()) { return } dispatch(addTodo(input.value))

How does connect work without mapDispatchToProps

由 泄露秘密 提交于 2020-01-08 14:39:20
问题 I was reading the example docs for redux and I found this example of a container component. Can someone explain why in this case mapDispatchToProps is not needed here. As well, how is the function getting the dispatch function? import React from 'react' import { connect } from 'react-redux' import { addTodo } from '../actions' let AddTodo = ({ dispatch }) => { let input return ( <div> <form onSubmit={e => { e.preventDefault() if (!input.value.trim()) { return } dispatch(addTodo(input.value))
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