Displaying React Back

The most basic thing you can do with UI is displaying some data. React makes it easy to display data and automatically keeps it up-to-date when the data changes.

Get Started

Firstly, we'll create a simple hello-react.html:

<!DOCTYPE html>
    <meta charset="UTF-8" />
    <title>Hello React</title>
    <script src="https://fb.me/react-15.2.1.js"></script>
    <script src="https://fb.me/react-dom-15.2.1.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.34/browser.min.js"></script>
    <div id="example"></div>
    <script type="text/babel">

      // ** Your code goes here! **


To replace the comments above with the following jsx:

var Hello = React.createClass({
    render: function () {
        return (
                Hello, <input type="text" placeholder="Your name here" />
                It's {this.props.date.toTimeString()}

setInterval(function () {
        <Hello date={new Date()} />,
}, 500);

Reactive Updates

If you run the example above, you will find that UI only updates time string, without changing the input elements even though you have input something. That's because React has figured it out and manage this behaviours.

Rect does not manipulate the DOM unless it needs to. It uses a fast, internal mock DOM to perform diffs and computes the most efficient DOM mutation for you.

Components are Just Like Functions

React components are very simple. You can think of them as simple functions that take in props and state (discussed later) and render HTML.


JSX is designed to directly generate HTML and component trees, which have a HTML-like syntax.

React without JSX

JSX is absolutly optional; you don't have to use JSX with React, and you can only create React elements in plain JavaScript using React.createElement.

var child1 = React.createElement('li', null, 'First Text Content');
var child2 = React.createElement('li', null, 'Second Text Content');
var root = React.createElement('ul', { className: 'my-list' }, child1, child2);
ReactDOM.render(root, document.getElementById('example'));

For convenience, you can create a short-hand factory functions to create elemtns from custom components:

var Factory = React.createFactory(ComponentClass);
/** ... */
var root = Factory({ custom: 'prop' });
ReactDOM.render(root, document.getElementById('example'));

React already has built-in factories for common HTML tags:

var root = React.DOM.ul({ className: 'my-list' },
    React.DOM.li(null, 'Text Content')
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