Hooks FAQ – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. The new documentation pages teaches React with Hooks. Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. This page answers some of the frequently asked questions about Hooks. Adoption Strategy Which versions of React include Hooks? Do I need to rewrite all
Introducing Hooks – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach React with Hooks: Quick Start Tutorial react: Hooks Hooks are a new addition in React 16.8. They let you use state and other React features without writing a class. import React, { useState } from 'react'; function Example() { // Declare a new state variable, which we'll call "count
isMounted is an Antipattern – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. As we move closer to officially deprecating isMounted, it’s worth understanding why the function is an antipattern, and how to write code without the isMounted function. The primary use case for isMounted() is to avoid calling setState() after a component has unmounted, because calling setState() after a component has
You Probably Don't Need Derived State – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. React 16.4 included a bugfix for getDerivedStateFromProps which caused some existing bugs in React components to reproduce more consistently. If this release exposed a case where your application was using an anti-pattern and didn’t work properly after the fix, we’re sorry for the churn. In this post, we will explain s
React v16.3.0: New lifecycles and context API - React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. A few days ago, we wrote a post about upcoming changes to our legacy lifecycle methods, including gradual migration strategies. In React 16.3.0, we are adding a few new lifecycle methods to assist with that migration. We are also introducing new APIs for long requested features: an official context API, a ref forwardin
Update on Async Rendering – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. For over a year, the React team has been working to implement asynchronous rendering. Last month during his talk at JSConf Iceland, Dan unveiled some of the exciting new possibilities async rendering unlocks. Now we’d like to share with you some of the lessons we’ve learned while working on these features, and some rec
React.Component – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React: React.Component This page contains a detailed API reference for the React component class definition. It assumes you’re familiar with fundamental React concepts, such as Components and Props, as well as State and Lifecycle. If you’re not, read them first. Overview Reac
Lists and Keys – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: Rendering Lists First, let’s review how you transform lists in JavaScript. Given the code below, we use the map() function to take an array of numbers and double their values. We assign the new array returned by map() to the variable doubled a
Behind the Scenes: Improving the Repository Infrastructure – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. As we worked on React 16, we revamped the folder structure and much of the build tooling in the React repository. Among other things, we introduced projects such as Rollup, Prettier, and Google Closure Compiler into our workflow. People often ask us questions about how we use those tools. In this post, we would like to
Portals – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: createPortal Portals provide a first-class way to render children into a DOM node that exists outside the DOM hierarchy of the parent component. The first argument (child) is any renderable React child, such as an element, string, or fragment.
Error Handling in React 16 – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. As React 16 release is getting closer, we would like to announce a few changes to how React handles JavaScript errors inside components. These changes are included in React 16 beta versions, and will be a part of React 16. By the way, we just released the first beta of React 16 for you to try! Behavior in React 15 and
React v15.5.0 – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. It’s been exactly one year since the last breaking change to React. Our next major release, React 16, will include some exciting improvements, including a complete rewrite of React’s internals. We take stability seriously, and are committed to bringing those improvements to all of our users with minimal effort. To that
Optimizing Performance – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React: memo: Skipping re-rendering when props are unchanged Internally, React uses several clever techniques to minimize the number of costly DOM operations required to update the UI. For many applications, using React will lead to a fast user interface without doing much wor
React v15.0 – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. We would like to thank the React community for reporting issues and regressions in the release candidates on our issue tracker. Over the last few weeks we fixed those issues, and now, after two release candidates, we are excited to finally release the stable version of React 15. As a reminder, we’re switching to major
Context – React
These docs are old and won’t be updated. Go to react.dev for the new React docs. These new documentation pages teach modern React and include live examples: Passing Data Deeply with Context useContext Context provides a way to pass data through the component tree without having to pass props down manually at every level. In a typical React application, data is passed top-down (parent to child) via
React v0.14 – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. We’re happy to announce the release of React 0.14 today! This release has a few major changes, primarily designed to simplify the code you write every day and to better support environments like React Native. If you tried the release candidate, thank you – your support is invaluable and we’ve fixed a few bugs that you
GraphQL Introduction – React Blog
This blog site has been archived. Go to react.dev/blog to see the recent posts. At the React.js conference in late January 2015, we revealed our next major technology in the React family: Relay. Relay is a new way of structuring client applications that co-locates data-fetching requirements and React components. Instead of placing data fetching logic in some other part of the client application –
1
リリース、障害情報などのサービスのお知らせ
最新の人気エントリーの配信
j次のブックマーク
k前のブックマーク
lあとで読む
eコメント一覧を開く
oページを開く
React Without ES6 – React
JSX In Depth – React