@novas/components

Minimal and performant React component library built on styled-components

Installation

yarn add @novas/components styled-components

babel-plugin-styled-components is also required to use the css prop (strongly recommended)

Basic Components

Form

• Checkbox - controlled or uncontrolled, native accessibility
• Radio - controlled or uncontrolled, native accessibility
• Select - controlled or uncontrolled, native accessibility
• Toggle - controlled or uncontrolled, native accessibility

Styles

• Global - has two props, reset for applying the CSS reset, and style which wraps createGlobalStyle
• Apply - use the css prop to apply the generated classname to all children (non-recursive) without a wrapping element. Useful for tiling by applying margins on arbitrary components.

Trigger

• <Trigger /> - a SubStateProvider with an api for tracking a hashmap of binary states. Useful for tabs, accordions, carousels, etc.

  • defaultActiveIds - array of ids
  • allowMultiActive - allow multiple active ids, default true
  • allowNoneActive - allow zero active ids, default true
  • children - standard React children

• const trigger = useTrigger(id) - wires a component up to the <Trigger /> context provider

  • id - string, number, or undefined (a substate key)

type TriggerProps = {
	id?: string | number
	active: boolean
	setActive: React.Dispatch<React.SetStateAction<boolean>>
	toggleActive: React.DispatchWithoutAction
	getActiveIds: () => (string | number)[]
	setActiveIds: (ids: (string | number)[]) => void
	setActiveById: (id: string | number, active: boolean) => void
	toggleById: (id: string | number) => void
	getIds: () => (string | number)[]
}

const Child = ({ triggerId }) => {
	const {
		id, // the id of this trigger
		active, // if this id is active
		setActive, // set this id's active state
		toggleActive, // toggle this id's active state
		getActiveIds, // get all active ids
		setActiveIds, // set all active ids
		setActiveById, // set some id's active state
		toggleById, // toggle some id's active state
		getIds, // get all ids regardless of active state
	} = useTrigger(triggerId)

	return (
		<div>
			<span
				style={{ color: active ? 'green' : 'red' }}
			>
				Active: {active}
			</span>
			<button onClick={tggleActive}>
				Toggle {id} active
			</button>
		</div>
	)
}

const Parent = () => (
	<Trigger
		defaultActiveIds={[ '1' ]}
		allowMultiActive={false}
		allowNonActive={false}
	>
		<Child triggerId="1" />
		<Child triggerId="2" />
	</Triggers>
)

Helpers

• media - media query object for responsive styles

• reset - CSS reset styles (used by <Global reset />)

• outline - element outline styles for accessibility (used in reset)

• styled - re-exports styled

• css - re-exports css

Motivation

Foregoing a theming library like styled-system saves on both runtime performance and bundle size. Relying on the css prop provided by babel-plugin-styled-components gives us the best of all worlds:

• Colocate CSS styles inline with components
• Easily extend and customize existing components
• Props and theme access
• Supports all CSS instead of a subset
• Better runtime performance than style props
• Smaller bundle size (realistically ~5kb smaller)

CSS custom properties can be used for theming instead of a JavaScript object, which will prevent the need to access the theme via props. Accessing the theme via props is still supported of course.

Usage

You should prefer to create new custom elements using the css prop or styled function syntax.

import { Global, Stack, Flex, media, styled } from '@novas/components'

const Heading = styled.h3({
	fontSize: '1.5rem',
	lineHeight: '1.2',
	color: 'var(--color-text)',
})

const Card = (props) => (
	<Stack
		{...props}
		css={{
			padding: '16px',
			borderRadius: '4px',
			boxShadow: '0 2px 3px 0 rgba(0, 0, 0, 0.2)',
			[media.lg]: {
				padding: '24px',
				borderRadius: '8px',
			},
		}}
	/>
)

const App = () => (
	<>
		<Global
			reset
			style={`
                :root {
                    --color-blue: #0000ff;
                    --color-text: #111111;
                }
			`}
		/>
		<Stack>
			<Heading as="h1" css={{ color: 'var(--color-blue)' }}>
				Hello world!
			</Heading>
			<main css={{ marginTop: '16px' }}>
				<Flex as="section" css={{ padding: '8px' }}>
					<Card>
						<Heading>Hello world</Heading>
						<p>Thanks for taking a look!</p>
					</Card>
				</Flex>
			</main>
		</Stack>
	</>
)

Form Component Styles

The source code for all four form components (Checkbox, Radio, Select, and Toggle) follows the same markup pattern:

<StyledContainer className={className}>
	<input {...props} ref={ref} /> {/* Hidden form element */}
	<span aria-hidden="true">{icon}</span> {/* Styles and icon */}
</StyledContainer>

These components have minimal default styles which mimic browser defaults, which allows for easily customizing styles. It's recommended to check the source code for these components to see the default styles, or explore them in browser devtools. Examples of customizing the components are shown below.

Checkbox and Radio Example

The Checkbox and Radio components share all of their styles except the border-radius. The Checkbox also uses the Checkmark icon by default while the Radio uses the Dot icon.

import { Checkbox } from '@novas/components'
import styled from 'styled-components'

const CustomCheckbox = styled(Checkbox)`
	width: 1.5rem;
	height: 1.5rem;

	span {
		border: 1px solid #767676;
		border-radius: 35%;
	}

	svg {
		fill: #ffffff;
	}

	input:disabled + span {
		background-color: #f8f8f8;
		border-color: #d1d1d1;
	}

	input:checked:not(:disabled) + span {
		background-color: #0277f6;
		border-color: #0277f6;
	}

	input:checked:disabled + span {
		background-color: #d1d1d1;
	}

	input:hover:not(:disabled) + span {
		border-color: #4f4f4f;
	}

	input:checked:hover:not(:disabled):not(:active) + span {
		background-color: #225ec1;
		border-color: #225ec1;
	}

	input:active + span {
		border-color: #8d8d8d;
	}

	input:checked:active + span {
		background-color: #4e94f7;
		border-color: #4e94f7;
	}
`

Select Example

The Select component uses the Chevron icon by default.

import { Select } from '@novas/components'
import styled from 'styled-components'

const CustomSelect = styled(Select)`
	max-width: 300px;

	select {
		color: #000000;
		border: 1px solid #000000;
		border-radius: 3px;
	}

	svg {
		fill: #000000;
	}

	select:disabled {
		color: #a6a6a6;
		background-color: #f8f8f8;
		border-color: #d1d1d1;
	}

	select:disabled + span svg {
		fill: #a6a6a6;
	}
`

Toggle Example

The Toggle is a native checkbox element, and uses the Dot icon by default.

import { Toggle } from '@novas/components'
import styled from 'styled-components'

const CustomToggle = styled(Toggle)`
	width: 3.5rem;
	height: 2rem;

	span {
		border: 1px solid #767676;
		border-radius: 55% / 100%;
	}

	svg {
		width: 50%;
		fill: #0277f6;
		stroke: #0277f6;
		stroke-width: 18%;
		transform: translateX(0%);
	}

	input:checked + span {
		background-color: #0277f6;
		border-color: #0277f6;
	}

	input:checked + span svg {
		fill: #ffffff;
		stroke: #ffffff;
		transform: translateX(100%);
	}
`