[React] Create and import React components with Markdown using MDXC

In this lesson I demonstrate how to use the library MDXC to create and import React components with Markdown. MDXC converts markdown into JavaScript and supports JSX. Additional Resources: https://github.com/jamesknelson/mdxc Create a React app by…

[React] Update State in React with Ramda's Evolve

In this lesson we'll take a stateful React component and look at how we can refactor our setState calls to use an updater function and then leverage Ramda's evolvefunction to make our updater function a reusable utility that isn't tied to the React A…

React报错之React hook 'useState' is called conditionally

正文从这开始~ 总览当我们有条件地使用useState钩子时,或者在一个可能有返回值的条件之后,会产生"React hook 'useState' is called conditionally"错误.为了解决该错误,将所有React钩子移到任何可能油返回值的条件之上. 这里有个例子用来展示错误是如何发生的. import React, {useState} from 'react'; export default function App() { const [count, set…

[React] Create & Deploy a Universal React App using Zeit Next

In this lesson, we'll use next to create a universal React application with no configuration. We'll create page components that will render on the server if accessed directly, but function as you would expect in the client. We'll use the routing capa…

[React] Create an Animate Content Placeholder for Loading State in React

We will create animated Content Placeholder as React component just like Facebook has when you load the page. Key points: 1. For each elements on the DOM, you might need to create a placeholder components for that. 2. Different size prop is important…

[React] Create component variations in React with styled-components and "extend"

In this lesson, we extend the styles of a base button component to create multiple variations of buttons, using "extend". We can then modify the base styles in one place, and have all button types updated. import React from "react"; im…

[React Router v4] Render Multiple Components for the Same Route

React Router v4 allows us to render Routes as components wherever we like in our components. This can provide some interesting use cases for creating dynamic routes on our applications. import React from 'react'; import { BrowserRouter as Router, Rou…

[React] Use the React Effect Hook in Function Components

Similar to the State Hook, the Effect Hook is “first-class” in React and handy for performing side effects in function components. The Effect Hook is called by passing a function as the first argument. Here, you can perform side effects. If needed, y…

React.createClass vs. ES6 Class Components

1 1 1 https://www.fullstackreact.com/articles/react-create-class-vs-es6-class-components/ React.createClass vs. ES6 Class Components New React developers are often confused when they encounter two different styles for declaring React components. The…

聊聊React高阶组件(Higher-Order Components)

使用 react已经有不短的时间了,最近看到关于 react高阶组件的一篇文章,看了之后顿时眼前一亮,对于我这种还在新手村晃荡.一切朝着打怪升级看齐的小喽啰来说,像这种难度不是太高同时门槛也不是那么低的东西如今可不多见了啊,是个不可多得的 zhuangbility的利器,自然不可轻易错过,遂深入了解了一番. 概述高阶组件的定义 React 官网上对高阶组件的定义: 高阶部件是一种用于复用组件逻辑的高级技术,它并不是 React API的一部分,而是从React 演化而来的一种模式. 具体地说,…

[React] Create a queue of Ajax requests with redux-observable and group the results.

With redux-observable, we have the power of RxJS at our disposal - this means tasks that would otherwise be complicated and imperative, become simple and declarative. In this lesson we’ll respond to an action by queuing up 2 separate Ajax requests th…

[React] Create a Virtualized List with Auto Sizing Cells using react-virtualized and CellMeasurer

In this lesson we'll use CellMeasurer and CellMeasurerCache to automatically calculate and cache the height of a row. This will allow us to remove the predefined rowHeight on list and allow for dynamically sized rows. import React, {Component} from '…

[React] Create an Auto Resizing Virtualized List with react-virtualized

In this lesson we'll show how to use the AutoSizer component from react-virtualized to automatically measure the width/height of our content area. We'll then use theList component to render our set of data as a virtualized list into the DOM using win…

[React] Create a Query Parameter Modal Route with React Router

Routes are some times better served as a modal. If you have a modal (like a login modal) that needs to be routeable and appear on all pages you may need to use query params. Will explore how to render a route all the time and use query params to cont…

[React] Create a Persistent Reference to a Value Using React useRef Hook

The useRef is a hook for creating values that persist across renders. In this lesson we'll learn how to use the useRef hook to measure the width of an element as it changes. import React, { useState, useEffect, useRef } from "react"; import Reac…

为什么import React from 'react'，React首字母必须大写？

很奇怪的是,明明没有用到 React,但是我不得不 import React.这是为什么? import React from 'react'; export default function (props) { return ( <form className="signIn" onSubmit={props.onSubmit}> {/* 登录*/} <form className="signIn" onSubmit={props.onSubmi…

parcel bug & not support normal import React & ReactDOM module

bug report not support normal import React & ReactDOM module, why Code Sample OK import * as React from "react"; impor { render } from "react-dom"; // import ReactDOM, { render } from "react-dom"; Error // import React fr…

react起步——从零开始编写react项目

# index.html <!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>Hello React!</title> <script src="https://unpkg.com/react@16/umd/react.development.js"></script> <script src=…

用 React 编写移动应用 React Native

转载:用 React 编写移动应用 React Native ReactNative 可以基于目前大热的开源JavaScript库React.js来开发iOS和Android原生App.而且React Native已经用于生产环境——Facebook Groups iOS 应用就是基于它开发的. React Native的原理是在JavaScript中用React抽象操作系统原生的UI组件,代替DOM元素来渲染,比如以<View>取代<div>,以<Image>替代&l…

【React Native开发】React Native控件之ListView组件解说以及最齐全实例(19)

),React Native技术交流4群(458982758).请不要反复加群!欢迎各位大牛,React Native技术爱好者加入交流!同一时候博客左側欢迎微信扫描关注订阅号,移动技术干货,精彩文章技术推送! ListView组件是React Native中一个比較核心的组件,用途很的广.该组件设计用来高效的展示垂直滚动的数据列表.最简单的API就是创建一个ListView.DataSource对象.同一时候给该对象传入一个简单的数据集合.而且使用数据源(data source)实例化一个Li…

【React Native开发】React Native控件之DrawerLayoutAndroid抽屉导航切换组件解说(13)

),请不要反复加群! 欢迎各位大牛,React Native技术爱好者增加交流!同一时候博客左側欢迎微信扫描关注订阅号,移动技术干货,精彩文章技术推送! 该DrawerLayoutAndroid组件封装了Android平台的DrawerLayout控件(仅仅限定与Android平台).该抽屉页面(经经常使用于导航页面)是通过renderNavigationView进行渲染的.该DrawerLayoutAndroid的中的子视图会变成主视图(主要用于放置内容).我们知道导航菜单中. 导航栏的视图在…

[React] Unit test a React Render Prop component

In this lesson, I use Enzyme and Jest to unit test a Counter Render Prop component. Writing integration tests are perfect for components that consume a Render Prop component. Likewise, unit tests are important to write for the Render Prop component i…

[React] Use the new React Context API

The React documentation has been warning us for a long time now that context shouldn't be used and that the API is unstable. Well, with the release of React 16.3, we're finally getting a stable context API and what's even better is that it has receiv…

arcgis api 4.x for js 结合 react 入门开发系列react全家桶实现加载天地图（附源码下载）

基于两篇react+arcgis的文章介绍,相信大家也能体会两者的开发区别了.在“初探篇”中作者也讲述了自己的选择,故废话不多说,本篇带大家体验在@arcgis/webpack-plugin环境下,使用react+redux+react-router+less+es6+webpack 开发(故在看本篇文章之前,请先了解相关知识). 效果图如下: 文件目录主要开发文件目录 assets 存放静态资源components 组件configure 全局配置.路由.reduxlayout 页面redu…

react基础学习和react服务端渲染框架next.js踩坑

说明 React作为Facebook 内部开发 Instagram 的项目中,是一个用来构建用户界面的优秀 JS 库,于 2013 年 5 月开源.作为前端的三大框架之一,React的应用可以说是非常的广泛.这里讲一个react服务端渲染的框架-next.js踩坑过程. 技术栈 react.next.js.ant design.axios 大纲按照以下思路来写: react基本语法 react基本语法参照react文档,这里发放一个链接https://doc.react-china.org/.…

React踩坑笔记 —— React

Webpack提供了自己的导入方式require.include,但同时也支持commonjs规范或AMD规范的require语法,而Node.js使用的就是common.js,ES6的语法Import也会被Babel转化成commonjs格式或者是AMD格式. ES6.CommonJS的导入是单例的: 单页应用默认直接加载出所有import的资源,所以: JS中的全局调用和表达式总会一开始就被执行,可以使用require()/import()语法实现动态加载.按需加载.可以配合Lazy(htt…