Styling React Applications

<> styled-components Max Stoiber @mxstbr Open Source Developer, Thinkmill

The Component Age

1. Small, focussed components 2. Use container components Best Practices:
Components

Small, focussed components

<Button className="btn"></Button> <Button className="btn btn--primary"></Button> Implementation detail! Implementation detail!

Split containers and components

class Sidebar extends React.Component { componentDidMount() { fetch('api.com/sidebar') .then(res =>
{ this.setState({ items: res.items }) }); } render() { return ( <div className="sidebar"> {this.state.items.map(item => ( <div className="sidebar__item">{item}</div> ))} </div> ) } }

class SidebarContainer extends React.Component { componentDidMount() { fetch('api.com/sidebar') .then(res =>
{ this.setState({ items: res.items }) }); } render() { return ( <Sidebar> {this.state.items.map(item => ( <SidebarItem item={item} /> ))} </Sidebar> ) } }

Containers = How things work Components = How things look

What about styling?

1. Single-use classes 2. Components as a styling construct Best
Practices: Styling

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

Enforcing best practices?

styled-components

Glen Maddern frontend.center

Remove the mapping between styles and components

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

Write actual CSS

import styled from 'styled-components'; const ColorChanger = styled.section` background: papayawhip;
> h2 { color: palevioletred; } @media (min-width: 875px) { background: mediumseagreen; > h2 { color: papayawhip; } } `;

color-changer

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 blueTheme =
{ primary: 'mediumseagreen', }; // … <ThemeProvider theme={redTheme}> <Button>I'm red!</Button> </ThemeProvider> <ThemeProvider theme={blueTheme}> <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> ); } }

$ yarn add styled-components github.com/styled-components/styled-components $ npm install styled-components

Thank you! Max Stoiber @mxstbr Come talk to me!

Styling React Applications

Styling React Applications

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