redux

React-Redux: What is the canonical way to bind a keypress action to kick off a reducer sequence?

末鹿安然 提交于 2021-01-23 13:08:41
问题 This is a newbie question for react-redux I spent a couple hours hunting around before finding so I am posting the question and then answering for posterity and also maybe code review. I am using react-redux to create a game where I want to use the WASD keys to move a character around a small map. (This is just a practice example for a larger endeavor). The map simply consists of a bunch of colored <div> s. As I understand it I need to somehow bind the keypress event to something in the React

如何利用 React Hooks 管理全局状态

不想你离开。 提交于 2021-01-22 18:01:43
来源 | https://www.cnblogs.com/xhyccc/p/14242492.html React 社区最火的全局状态管理库必定是 Redux,但是 Redux 本身就是为了大型管理数据而妥协设计的——这就会让一些小一点的应用一旦用上 Redux 就变得复杂无比。 后来又有了 Mobx,它对于小型应用的状态管理确实比 Redux 简单不少。可是不得不说 Mobx+React 简直就是一个繁琐版本的 Vue。所以我也不太喜欢,不如直接用 Vue3。 总而言之,不管是 react-redux 还是 mobx,他们使用的时候都非常复杂,甚至需要你去组件函数或是组件类上修修改改,从审美角度上来说就令人不太喜欢。 直到后来某一天用了 Angular,我就开始对 SOA 产生好感,ng 的 Service 的写法与依赖注入控制反转着实惊艳到了我。 Service 是 Angular 的逻辑复用方法,并且解决了共享状态的问题,那 React 的自定义 Hook 可以达到类似的效果嘛? 可以,并且会比 Angular 更简洁!!! 什么是 Service 我们先来想一下,Service 到底是什么? Service 包含 n 个方法; Service 包含有状态; Service 应该是个单例。 这些方法与状态应该是高度整合的,一个 Service 解决的是一个模块的问题。

React17+React Hook+TS4 最佳实践 仿 Jira 企业级项目

送分小仙女□ 提交于 2021-01-21 21:03:33
download: React17+React Hook+TS4 最佳实践 仿 Jira 企业级项目 React17 + React Hook + TypeScript4 已成为大型React 项目质量保证的代名词,更是 2021年优秀 React 开发者必备的技术。本课程将通过完成一个功能强大的任务管理项目,带领大家掌握最佳实践,全方位提升开发效率、开发质量和技术能力。 技术要求 有 React 基础 环境参数 React 17.0.1 / TypeScript 4.0.5 / react-router : 6.0.0 / create-react-app 4.0.1 react-query: 1.0.0 / emotion: 10.0.35 / cypress: 6.1.0 / jest: 26.6.3 章节目录: 第一章课程介绍(本课程是必看的)试看 介绍了课程整体的背景知识、能解决什么问题、学习后能得到什么、学习方法和学习前提。 总共保存2节(12分钟)列表 1-1课程指南(11:06 )试试 下载1-2课程源 第二章项目出航:项目初始化与配置 本章介绍Create-React-App初始化项目。 然后,构成eslint检查代码质量、prettier检查代码格式、commitlint检查提交信息,规范流程。 最后配置优秀的后端mock方案,在JSON SERVER第3

Cannot update a component while rendering a different component warning

…衆ロ難τιáo~ 提交于 2021-01-21 12:12:51
问题 I am getting this warning in react: index.js:1 Warning: Cannot update a component (`ConnectFunction`) while rendering a different component (`Register`). To locate the bad setState() call inside `Register` I went to the locations indicated in the stack trace and removed all setstates but the warning still persists. Is it possible this could occur from redux dispatch? my code: register.js class Register extends Component { render() { if( this.props.registerStatus === SUCCESS) { // Reset

Cannot update a component while rendering a different component warning

二次信任 提交于 2021-01-21 12:11:53
问题 I am getting this warning in react: index.js:1 Warning: Cannot update a component (`ConnectFunction`) while rendering a different component (`Register`). To locate the bad setState() call inside `Register` I went to the locations indicated in the stack trace and removed all setstates but the warning still persists. Is it possible this could occur from redux dispatch? my code: register.js class Register extends Component { render() { if( this.props.registerStatus === SUCCESS) { // Reset

Axios: getting two requests OPTIONS & POST

こ雲淡風輕ζ 提交于 2021-01-21 06:24:29
问题 I have a React app built using Redux and React and I'm trying to post data. Everything works fine, but I don't know why I'm getting two requests OPTIONS & POST Perhaps because the API URL isn't on the same server as react. POST: OPTIONS: Here's the code: const url = 'http://rest.learncode.academy/api/johnbob/myusers'; export function postUsers(username, password) { let users = { username, password, }; return{ type: "USERS_POST", payload: axios({ method:'post', url:url, data: users, }) .then

【前端词典】Vuex 注入 Vue 生命周期的过程

僤鯓⒐⒋嵵緔 提交于 2021-01-20 15:31:50
前言 这篇文章是【前端词典】系列文章的第 13 篇文章,接下的 9 篇我会围绕着 Vue 展开,希望这 9 篇文章可以使大家加深对 Vue 的了解。当然这些文章的前提是默认你对 Vue 有一定的基础。如果一点基础都没有,建议先看官方文档。 第一篇文章我会结合 Vue 和 Vuex 的部分源码,来说明 Vuex 注入 Vue 生命周期的过程。 说到源码,其实没有想象的那么难。也和我们平时写业务代码差不多,都是方法的调用。但是源码的调用树会复杂很多。 为何使用 Vuex 使用 Vue 我们就不可避免的会遇到组件间共享的数据或状态。应用的业务代码逐渐复杂,props、事件、事件总线等通信的方式的弊端就会愈发明显。这个时候我们就需要 Vuex 。Vuex 是一个专门为 Vue 设计的状态管理工具。 状态管理是 Vue 组件解耦的重要手段。 它借鉴了 Flux、redux 的基本思想,将状态抽离到全局,形成一个 Store。 Vuex 不限制你的代码结构,但需要遵守一些规则: 应用层级的状态应该集中到单个 store 对象中 提交 mutation 是更改状态的唯一方法,并且这个过程是同步的 异步逻辑都应该封装到 action 里面 Vuex 注入 Vue 生命周期的过程 我们在安装插件的时候,总会像下面一样用 Vue.use() 来载入插件,可是 Vue.use() 做了什么呢?

What is the purpose of the “@@INIT” action in react-redux?

浪子不回头ぞ 提交于 2021-01-19 19:53:23
问题 Just noticed that it is always the first action dispatched when a page is opened. Is it used to initialize the store with the default state from the reducer? 回答1: I think this will answer your question. // When a store is created, an "INIT" action is dispatched so that every // reducer returns their initial state. This effectively populates // the initial state tree. dispatch({ type: ActionTypes.INIT }) Source UPDATE 24.02.2020 Since @IsaacLyman explicitly asked about this and got some

Using react-select I've got next issue: Cannot read property 'value' of undefined

那年仲夏 提交于 2021-01-19 10:11:48
问题 I'm using react-select . When I'm selecting a determinate value from select I've got the next issue TypeError: Cannot read property 'value' of undefined Also, values fetched from reducer todoList are not showed, I can't see them. This is my code: import Select from "react-select"; import "./styles.css"; import { searchTodos } from "../../actions/ServiceActions"; class SelectedTodo extends Component { constructor(props) { super(props); this.state = { selectedTodo: "" }; this.handleChange =

Local package.json exists, but node_modules missing

三世轮回 提交于 2021-01-16 05:14:06
问题 I am trying to start a Redux application I just cloned from a GitHub repository. I tried to run it with the following command npm start I am getting this error > react-redux@1.0.0 start /home/workspace/assignment > webpack-dev-server --config ./configs/webpack/webpack.config.development.js sh: 1: webpack-dev-server: not found npm ERR! file sh npm ERR! code ELIFECYCLE npm ERR! errno ENOENT npm ERR! syscall spawn npm ERR! react-redux@1.0.0 start: `webpack-dev-server --config ./configs/webpack