Creating React Components

Young Bae, young.gratia@navercorp.com

NAVER Place Service Dev 2

with BEM & styled-component

Naver
SmartPlace
Front-end

Before we start, Why bother?

Comparison

Old-fashined way Brand-new way
Dev Scope Page πŸ“„ Component 🍱
CSS Tools Sass (+ style-loader, css-loader, etc) CSS-in-JS πŸ’…
CSS Style Conflict Possibility I hope not! 😫  What is it? πŸ€—
Finger Fatigue ✌️ High Low

Things to consider

  1. Can we use CSS Methodologies?
  2. What kind of CSS-in-JS tools shall we use?​
  3. How about the project structure?

Reusing CSS Methodologies

BEM & Atomic Web Design

Methodology List

  • OOCSS
  • SMACSS
  • Atomic CSS
  • MCSS
  • FUN

https://css-tricks.com/methods-organize-css/

BEM!

LEGOΒ Blocks!

BEM Applied to React

  1. First, Build theΒ ElementΒ components first.
  2. Combine elements to make Blocks.

  3. Use prop, or CSS class as Modifier.

Atomic
Web Design

Atoms can also include more abstract elements like color palettes, fonts and even more invisible aspects of an interface like animations.

http://bradfrost.com/blog/post/atomic-web-design/#atoms

Conclusion

  1. Use the similar concept to BEM,
    but the elements should not be restricted to blocks.
  2. Like from 'Atomic Web Design',
    let's put abstract atoms into elements.

Choosing the Right Tools

styled-components & storybook

https://twitter.com/markdalgleish/status/927480707663904768

CSS-in-JS

https://github.com/MicheleBertoli/css-in-js#features

styled-components

CSS Class Generated by
styled-components

static class

https://www.styled-components.com/docs/faqs#why-do-my-dom-nodes-have-two-classes

dynamic class

Using JS object to store style info

export const Z_INDEX = Object.freeze({
  alertDialog: 500,
  address: {
    dialog: 100,
    form: 100,
  },
  bizphoneSelector: 10,
  dimmed: 1000,
  floatingButton: 500,
  drawer: 1000,
  drawerHeader: 10,
  gnb: 1000,
  modal: 10000,
  modalStickyHeader: 100,
  opening: 1100,
  openingFormBorder: 1,
  thumbButton: 10,
})
const Color = {
  background: '#e8edf0',
  backgroundLight: '#f4f7f8',
  backgroundFooter: '#f4f6f7',
  backgroundGray: '#fafbfc',
  backgroundLightGray: '#f5f9ff',
  black: '#000',
  blackTransparent: alpha => `rgba(0,0,0,${alpha})`,
  blue: '#14a0fa',
  blueDark: '#0068c3',
  blueLight: '#7abeea',
  border: '#d9dadb',
  borderLight: '#ecf0f2',
  borderOuter: '#e2e5e8',
  borderSkyblue: '#90d4ff',
  green: '#00c73c',
  greenDark: '#0abe16',
  mainText: '#424242',
  navy: '#0068c3',
  red: '#ff3c4c',
  redLight: '#ffe0e1',
  subText: '#8f8f8f',
  subTextLight: '#a9a9a9',
  title: '#242424',
  white: '#fff',
  disabled: '#ccc',
}

export default Color

Global Styling

import { createGlobalStyle } from 'styled-components'
import Font from 'assets/Font'
import Color from 'elements/Color'

// Thigns to include:
// - font-face rule
// - reset CSS
// - util classes, etc.

const GlobalStyle = createGlobalStyle`
@font-face {
	font-weight: 300;
	font-family: 'NanumSquare';
	src: url(${Font.nanumSquareLight}) format("truetype");
}
@font-face {
	font-weight: 400;
	font-family: 'NanumSquare';
	src: url(${Font.nanumSquareRegular}) format("truetype");
}
// ...

Where should we put those components?

storybook

https://github.com/storybooks/storybook

Add-ons

viewport

storysource

a11y

Component Classification

  • Assets
  • Elements
  • Blocks
  • Containers

Storybook

Project

src/
β”œβ”€β”€ assets/
β”‚   β”œβ”€β”€ Font/
β”‚   β”œβ”€β”€ GlobalStyle/
β”‚   β”œβ”€β”€ Icon/
β”‚   └── Image/
β”œβ”€β”€ blocks/
β”‚   β”œβ”€β”€ Accordion/
β”‚   β”œβ”€β”€ AgreementList/
β”‚   β”œβ”€β”€ AlertDialog/
β”‚   β”œβ”€β”€ BizCard/
β”‚   └── ...
β”œβ”€β”€ containers/
β”‚   β”œβ”€β”€ Businesses
β”‚   β”œβ”€β”€ Footer
β”‚   β”œβ”€β”€ Gnb
β”‚   └── ...
β”œβ”€β”€ elements/
β”‚   β”œβ”€β”€ Button/
β”‚   β”œβ”€β”€ Checkbox/
β”‚   └── ...
β”œβ”€β”€ modals/
β”‚   β”œβ”€β”€ BizDelegation/
β”‚   β”œβ”€β”€ BizDelete/
β”‚   └── ...
β”œβ”€β”€ ...

πŸ‘ΆπŸ‘Ά

πŸ‘¦πŸ‘¦

πŸ‘§πŸ‘§

...

Personal Favorite πŸ’–

import styled from 'styled-components'
import Color from 'elements/Color'

const Hr = styled.hr`
  margin: 0;
  border-top: 1px solid ${Color.borderOuter};
  border-bottom: 1px solid ${Color.borderOuter};
  height: 9px;
  background-color: ${Color.background};
`

export default Hr

References

References

Food for Thought

Things to consider

Working Process

  • At the early stage of the project, make the components focusing on the elements.
    • For the convenience of the development process, the design guide should be focused on the element components πŸ™‚
    • High priorities
      • Buttons
      • Forms (e.g., input elements such as text, radio, select)

Working Process

  • Don't make the independent block components in advance.
    • If you are sure it's going to be reused without any big modification, then it's okay to separate the component as a block.
    • If not sure, just put the components below the container component directories.

Working Process

  • Example: Refactor Navigation Block Component

Testing

Maintenance

  • Concerns for newly joined people πŸ‘€
    • Lost in Components.
    • Tell them about the criteria about the categorization.
    • Don't push them too much to reuse exisiting components.

Maintenance

  • New Request: Please make us new components! πŸ™‡
    • Ask First:
      • Do you just want "UI"πŸ’„? Or the "features"πŸ€–?
    • Don't be under pressure.
      • Refactoring is always waiting for you.

Make Your Own
IKEAΒ Storybook Catalogue

https://images.summitmedia-digital.com/realliving/images/2018/08/02/IKEA-WIDE.jpg

STORYBOOK

Β We're Hiring!

http://bit.ly/2DXguFs

Creating React Components

By Young B

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