[React] Use Prop Collections with Render Props

Sometimes you have common use cases that require common props to be applied to certain elements. You can collect these props into an object for users to simply apply to their elements and we'll see how to do that in this lesson.

We have 'button' and 'Switch' component which shares same attrs:

    <Toggle
        onToggle={(on) => console.log("Toggle", on)}
        render={({on, toggle}) => (
            <div>
                {on
                    ? 'The button is on'
                    : 'The button is off'
                }
                <Switch on={on} onClick={toggle} aria-expanded={on}/>
                <hr />
                <button onClick={toggle} aria-expanded={on}>
                    {on ? 'on': 'off'}
                </button>
            </div>
        )}
    />;

We can pass the same props from the render props:

    <Toggle
        onToggle={(on) => console.log("Toggle", on)}
        render={({on, toggle, toggleProps}) => (
            <div>
                {on
                    ? 'The button is on'
                    : 'The button is off'
                }
                <Switch on={on} {...toggleProps} />
                <hr />
                <button {...toggleProps}>
                    {on ? 'on': 'off'}
                </button>
            </div>
        )}
    />;

import React from 'react';

class Toggle extends React.Component {

  // An empty function
  static defaultProps = {onToggle: () => {}};

  // default state value
  state = {on: false};

  // toggle method
  toggle = () =>
    this.setState(
      ({on}) => ({on: !on}),
      () => {
        this.props.onToggle(this.state.on)
      }
    );

  render() {
    return this.props.render({
        on: this.state.on,
        toggle: this.toggle,
        toggleProps: {
            'aria-expanded': this.state.on,
            onClick: this.toggle,
        }
    });
  }
}

export default Toggle;