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Adding React directly in HTML

Addingthree files (and your component .js file(s)) to your HTML file allows you to quickly use React:


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<!DOCTYPE html><html>
  <head>
    <meta charset="UTF-8" />
    <title>Add React in One Minute</title>
  </head>
  <body>
    <h2>Add React in One Minute</h2>
    <p>This page demonstrates using React with no build tooling.</p>
    <p>React is loaded as a script tag.</p>
    <div id="like_button_container"></div>
    <!-- Load React. -->
    <!-- Note: when deploying, replace "development.js" with "production.min.js". --> <script src="https://unpkg.com/react@17/umd/react.development.js" crossorigin></script> <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" crossorigin></script> <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
    <!-- Load our React component LAST. -->
    <script src="like_button.js" type="text/babel"></script>
  </body></html>

// like_button.js'use strict';const e = React.createElement;class LikeButton extends React.Component {
  constructor(props) {
    super(props);
    this.state = { liked: false };
  }
  render() {
    if (this.state.liked) {
      return 'You liked this.';
    }
    return (
    /* JSX code following… */
      <button onClick={() => this.setState({ liked: true })}>
          Like
      </button>
    );
  }}const domContainer = document.querySelector('#like_button_container');ReactDOM.render(e(LikeButton), domContainer);

After you have finalized your source codes, to build an optimized webpage for your site visitors, you should be using the production-ready files:


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<script crossorigin src="https://unpkg.com/react@17/umd/react.production.min.js" ></script><script crossorigin
       src="https://unpkg.com/react-dom@17/umd/react-dom.production.min.js" ></script>

and compile the JSX code using Babel:

npm install babel-cli babel-preset-react-appnpx babel --watch *.js --out-dir build --presets react-app/prod

Any JSX code will be instantly converted to browser-compatible JS codes as you save the files.

You won't need to explicitly import React as is the case for Create-React-App(1.2):


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import React, { Component } from 'react';   // already imported in prior <script>…</script>

To do away with the boilerplate 'React.', you can assign a member manually:


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const Component = React.Component;