Flarnie Marchan
076bbeace7
* Add fixture test for schedule running when tab is backgrounded **what is the change?:** Just adding a test to the fixture, where we can easily see whether scheduled callbacks are called after switching away from the fixture tab. **why make this change?:** We are about to fix the schedule module so that it still runs even when the tab is in the backround. **test plan:** Manually tested the fixture, verified that it works as expected and right now callbacks are not called when the tab is in the background. **issue:** Internal task T30754186 * Fall back to 'setTimeout' when 'requestAnimationFrame' is not called **what is the change?:** If 'requestAnimationFrame' is not called for 100ms we fall back to 'setTimeout' to schedule the postmessage. **why make this change?:** When you start loading a page, and then switch tabs, 'requestAnimationFrame' is throttled or not called until you come back to that tab. That means React's rendering, any any other scheduled work, are paused. Users expect the page to continue loading, and rendering is part of the page load in a React app. So we need to continue calling callbacks. **test plan:** Manually tested using the new fixture test, observed that the callbacks were called while switched to another tab. They were called more slowly, but that seems like a reasonable thing. **issue:** Internal task T30754186 * make arguments more explicit
React · 
React is a JavaScript library for building user interfaces.
- Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug.
- Component-Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and keep state out of the DOM.
- Learn Once, Write Anywhere: We don't make assumptions about the rest of your technology stack, so you can develop new features in React without rewriting existing code. React can also render on the server using Node and power mobile apps using React Native.
Learn how to use React in your own project.
Documentation
You can find the React documentation on the website.
It is divided into several sections:
You can improve it by sending pull requests to this repository.
Examples
We have several examples on the website. Here is the first one to get you started:
class HelloMessage extends React.Component {
render() {
return <div>Hello {this.props.name}</div>;
}
}
ReactDOM.render(
<HelloMessage name="John" />,
document.getElementById('container')
);
This example will render "Hello John" into a container on the page.
You'll notice that we used an HTML-like syntax; we call it JSX. JSX is not required to use React, but it makes code more readable, and writing it feels like writing HTML. We recommend using Babel with a React preset to convert JSX into native JavaScript for browsers to digest.
Installation
React is available as the react package on npm. It is also available on a CDN.
React is flexible and can be used in a variety of projects. You can create new apps with it, but you can also gradually introduce it into an existing codebase without doing a rewrite.
The recommended way to install React depends on your project. Here you can find short guides for the most common scenarios:
Contributing
The main purpose of this repository is to continue to evolve React core, making it faster and easier to use. Development of React happens in the open on GitHub, and we are grateful to the community for contributing bugfixes and improvements. Read below to learn how you can take part in improving React.
Code of Conduct
Facebook has adopted a Code of Conduct that we expect project participants to adhere to. Please read the full text so that you can understand what actions will and will not be tolerated.
Contributing Guide
Read our contributing guide to learn about our development process, how to propose bugfixes and improvements, and how to build and test your changes to React.
Good First Issues
To help you get your feet wet and get you familiar with our contribution process, we have a list of good first issues that contain bugs which have a relatively limited scope. This is a great place to get started.
License
React is MIT licensed.