Styling Intro

Styling React Applications Max Stoiber @mxstbr Open Source Developer, Thinkmill

Let’s talk about styling

The Checklist

No build requirements Small and lightweight Supports global CSS Supports
entirety of CSS Colocated Isolated Easy to override Theming Server side rendering No wrapper components

There is no ✅✅✅ solution

Every app is different

The Example

fake.twitter.com

fake.twitter.com <Tweet> <App>

fake.twitter.com <Tweet> <Header> <Content> <Footer>

1. CSS 2. Inline Styles 3. CSS Modules 4. styled-components
The Methods

html { color: #292f33; font-family: Helvetica, Arial, sans-serif; font-size: 14px;
line-height: 1.3125; } .container { margin: 0 auto; width: 100%; } @media screen and (min-width: 360px) { html { font-size: 15px; } .container { max-width: 400px; } }

.tweet__content { font-size: 1.25rem; font-weight: 300; line-height: 1.5em; margin: 0;
padding: .65625rem 0 .98438rem; } .tweet__content a { color: #1da1f2; } .tweet__content a:hover { text-decoration: underline; }

const Content = ({ text, media }) => ( <div>
<p className=“tweet__content" dangerouslySetInnerHTML={{ __html: text }} /> <a className=“tweet__media" target=“_blank" href={media.expanded_url} > <img className=“tweet__image" src={media.media_url_https} alt=“" /> </a> </div> );

entirety of CSS Colocated Isolated Easy to override Theming Server side rendering No wrapper components ✅ ✅ ✅ ✅ ❌ ❌ ✅ (Custom Properties) ✅ ✅

The Methods

const styles = { container: { margin: '0 auto', width:
'100%' } }

const styles = { content: { fontSize: '1.25rem', fontWeight: '300',
lineHeight: '1.5em', margin: 0, padding: '.65625rem 0 .98438rem' } }

const Content = ({ text, media }) => ( <div>
<p style={styles.content} dangerouslySetInnerHTML={{ __html: text }} /> <a style={styles.media} target=“_blank" href={media.expanded_url} > <img style={styles.image} src={media.media_url_https} alt=“" /> </a> </div> );

entirety of CSS Colocated Isolated Easy to override Theming Server side rendering No wrapper components ✅ ✅ ❌ ❌ ✅ ✅ ❌ ❌ ✅ ✅

The Methods

html { color: #292f33; font-family: Helvetica, Arial, sans-serif; font-size: 14px;
line-height: 1.3125; } .container { margin: 0 auto; width: 100%; } @media screen and (min-width: 360px) { html { font-size: 15px; } .container { max-width: 400px; } }

.content { font-size: 1.25rem; font-weight: 300; line-height: 1.5em; margin: 0;
padding: .65625rem 0 .98438rem; } .content a { color: #1da1f2; } .content a:hover { text-decoration: underline; }

import styles from './content.css'; const Content = ({ text, media
}) => ( <div> <p className={styles.content} dangerouslySetInnerHTML={{ __html: text }} /> <a className={styles.media} target=“_blank" href={media.expanded_url} > <img className={styles.image} src={media.media_url_https} alt=“" /> </a> </div> );

/* content.css */ .content { /* … */ } .content__content__a452s
{ /* … */ } /* home.css */ .content { /* … */ } .home__content__juz65 { /* … */ }

entirety of CSS Colocated Isolated Easy to override Theming Server side rendering No wrapper components ❌ (requires webpack) ✅ ✅ ✅ (has to be separate ﬁle) ✅ ✅ ❌ ✅ ✅

If you’re writing React, you have access to a more
powerful styling construct than CSS class names. You have components.” – Michael Chan, @chantastic “

The Methods

const styles = { color: '#000', }; Inline styles vs.
CSS-in-JS // Inline styles: <p style={styles} /> // CSS-in-JS (requires lib): <p className={styles} />

import styled from 'styled-components'; const Title = styled.h1` font-size: 1.5em;
text-align: center; color: palevioletred; `; const Wrapper = styled.section` color: palevioletred; padding: 4em; width: 100%; height: 100%; background: papayawhip; `;

text-align: center; color: palevioletred; `; const Wrapper = styled.section` color: palevioletred; padding: 4em; width: 100%; height: 100%; background: papayawhip; `; styled.h1

text-align: center; color: palevioletred; `; const Wrapper = styled.section` color: palevioletred; padding: 4em; width: 100%; height: 100%; background: papayawhip; `;

const App = () => ( <Wrapper> <Title> Hello World,
this is my first styled component! </Title> </Wrapper> ); ReactDOM.render( <App />, document.getElementById(‘#app') );

styled-components

Adapting based on props

<Button>Normal</Button> <Button primary>Primary</Button>

const Button = styled.button` /* Adapt the colors based on
primary prop */ background: ${(props) => props.primary ? 'palevioletred' : 'white' }; color: ${(props) => props.primary ? 'white' : 'palevioletred' }; font-size: 1em; margin: 1em; padding: 0.25em 1em; border: 2px solid palevioletred; border-radius: 3px; `; export default Button;

<Button>Normal</Button> <Button primary>Primary</Button>

styled-components

Theming Built In

import { ThemeProvider } from 'styled-components'; const theme = {
primary: 'palevioletred', }; const App = () => ( <ThemeProvider theme={theme}> <Root /> </ThemeProvider> );

import styled from 'styled-components'; const Button = styled.button` /* Adjust
background based on the theme */ background: ${props => props.theme.primary}; color: white; `;

styled-components

const redTheme = { primary: 'palevioletred', }; const greenTheme =
{ primary: 'mediumseagreen', }; // … <ThemeProvider theme={redTheme}> <Button>I'm red!</Button> </ThemeProvider> <ThemeProvider theme={greenTheme}> <Button>I'm green!</Button> </ThemeProvider>

styled-components

<ThemeProvider theme={redTheme}> <div> <Button>I'm still red!</Button> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <Button>I'm still red!</Button> </Container> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <Button>I'm still red!</Button> </div> </Container>
</div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <SidebarContainer> <Button>I'm still red!</Button> </SidebarContainer>
</div> </Container> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <SidebarContainer> <Sidebar> <Button>I'm still red!</Button>
</Sidebar> </SidebarContainer> </div> </Container> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <SidebarContainer> <Sidebar> <SidebarItem> <Button>I'm still
red!</Button> </SidebarItem> </Sidebar> </SidebarContainer> </div> </Container> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <SidebarContainer> <Sidebar> <SidebarItem> <div> <Button>I'm
still red!</Button> </div> </SidebarItem> </Sidebar> </SidebarContainer> </div> </Container> </div> </ThemeProvider>

<ThemeProvider theme={redTheme}> <div> <Container> <div> <SidebarContainer> <Sidebar> <SidebarItem> <div> <span>
<Button>I'm still red!</Button> </span> </div> </SidebarItem> </Sidebar> </SidebarContainer> </div> </Container> </div> </ThemeProvider>

Full ReactNative Support

import styled from 'styled-components/native'; const Wrapper = styled.View` background-color: papayawhip;
flex: 1; justify-content: center; align-items: center; `; const Title = styled.Text` font-size: 20; text-align: center; margin: 10; color: palevioletred; font-weight: bold; `;

class StyledComponentsNative extends Component { render() { return ( <Wrapper>
<Title> Hello World, this is my first native styled component! </Title> </Wrapper> ); } }

entirety of CSS Colocated Isolated Easy to override Theming Server side rendering No wrapper components ✅ ✅ ✅ ✅ ✅ ✅ ✅ ✅ ✅ ❌

Get styling! git checkout 4-styling

Styling Intro

Styling Intro

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