React Component patterns

01-stateless.js

const Button = props =>
  <button onClick={props.onClick}>
    {props.text}
  </button>

02-stateful.js

class ButtonCounter extends React.Component {
  constructor() {
    super()
    this.state = { clicks: 0 }
    this.handleClick = this.handleClick.bind(this)
  }

  handleClick() {
    this.setState({ clicks: this.state.clicks + 1 })
  }

  render() {
    return (
      <Button
        onClick={this.handleClick}
        text={`You've clicked me ${this.state.clicks} times!`}
      />
    )
  }
}

03-presentational.js

const UserList = props =>
  <ul>
    {props.users.map(u => (
      <li>{u.name} — {u.age} years old</li>
    ))}
  </ul>

04-container.js

class UserListContainer extends React.Component {
  constructor() {
    super()
    this.state = { users: [] }
  }

  componentDidMount() {
    fetchUsers(users => this.setState({ users }))
  }

  render() {
    return <UserList users={this.state.users} />
  }
}

05-hoc.js

function makeToggleable(Clickable) {
  return class extends React.Component {
    constructor() {
      super()
      this.toggle = this.toggle.bind(this)
      this.state = { show: false }
    }

    toggle() {
      this.setState(prevState => ({ show: !prevState.show }))
    }

    render() {
      return (
        <div>
          <Clickable
            {...this.props}
            onClick={this.toggle}
          />
          {this.state.show && this.props.children}
        </div>
      )
    }
  }
}

06-hoc-usage.js

@makeToggleable
class ToggleableMenu extends React.Component {
  render() {
    return (
      <div onClick={this.props.onClick}>
        <h1>{this.props.title}</h1>
      </div>
    )
  }
}

07-hoc-menu.js

class Menu extends React.Component {
  render() {
    return (
      <div>
        <ToggleableMenu title="First Menu">
          <p>Some content</p>
        </ToggleableMenu>
        <ToggleableMenu title="Second Menu">
          <p>Another content</p>
        </ToggleableMenu>
        <ToggleableMenu title="Third Menu">
          <p>More content</p>
        </ToggleableMenu>
      </div>
    )
  }
}

08-render-callback.js

class Toggleable extends React.Component {
  constructor() {
    super()
    this.toggle = this.toggle.bind(this)
    this.state = { show: false }
  }

  toggle() {
    this.setState(prevState => ({ show: !prevState.show }))
  }

  render() {
    return this.props.children(this.state.show, this.toggle)
  }
}

09-render-callback-usage.js

<Toggleable>
  {(show, onClick) => (
    <div>
      <div onClick={onClick}>
        <h1>First Menu</h1>
      </div>
      {show ?
        <p>Some content</p>
        : null
      }
    </div>
  )}
</Toggleable>

10-render-callback-usage-reusable.js

const ToggleableMenu = props =>
  <Toggleable>
    {(show, onClick) => (
      <div>
        <div onClick={onClick}>
          <h1>{props.title}</h1>
        </div>
        {show && props.children}
      </div>
    )}
  </Toggleable>

11-render-callback-menu.js

class Menu extends React.Component {
  render() {
    return (
      <div>
        <ToggleableMenu title="First Menu">
          <p>Some content</p>
        </ToggleableMenu>
        <ToggleableMenu title="Second Menu">
          <p>Another content</p>
        </ToggleableMenu>
        <ToggleableMenu title="Third Menu">
          <p>More content</p>
        </ToggleableMenu>
      </div>
    )
  }
}