Advanced Component Patterns

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siddharthkp

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I teach React

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MUST LEARN ALL PATTERNS

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7 component patterns

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DESIGN DEVELOPMENT

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const TextInput = props => { return ( ) } render( )

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const TextInput = props => { return ( ) } render( )

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const TextInput = props => { return ( ) } render( )

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const TextInput = props => { let classes = 'input' if (props.readOnly) classes += ' readonly' return ( ) } render( )

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const TextInput = props => { let classes = 'input' if (props.readOnly) classes += ' readonly' return ( ) } render( )

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Functional component

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const TextInput = props => { let classes = 'input' if (props.readOnly) classes += ' readonly' return ( ) } render( )

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0 chars

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const TextInput = props => { return ( ) } 0 chars

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const TextInput = props => { return (

0 chars

) } 0 chars

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class TextInput extends React.Component { render() { return (

0 chars

) } } 0 chars

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class TextInput extends React.Component { render() { return (

0 chars

) } } 0 chars

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class TextInput extends React.Component { constructor(props) { super(props) this.state = { length: 0 } } render() { return (

0 chars

) } 0 chars

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class TextInput extends React.Component { constructor(props) { super(props) this.state = { length: 0 } } render() { return (

{this.state.length} chars

) } 0 chars

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class TextInput extends React.Component { constructor(props) { ... } render() { return (

{this.state.length} chars

) } 0 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) } 0 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) 0 chars Abc 3 chars

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Class component

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class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) 0 chars Abc 3 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) 0 chars Abc 3 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) 0 chars Abc 3 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange = (event) => { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) 0 chars Abc 3 chars

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class TextInput extends React.Component { constructor(props) { ... } onChange = (event) => { ... } render() { return (

{this.state.length} chars

0 chars Abc 3 chars

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class TextInput extends React.Component { constructor(props) { super(props) this.state = { length: 0 } } onChange = (event) => { ... } render() { return (

{this.state.length} chars

0 chars Abc 3 chars

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class TextInput extends React.Component { state = { length: 0 } onChange = (event) => { ... } render() { return (

{this.state.length} chars

0 chars Abc 3 chars

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class TextInput extends React.Component { state = { length: 0 } onChange = (event) => { ... } render() { return (

{this.state.length} chars

) } } 0 chars Abc 3 chars

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1/3

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class TextInput extends React.Component { state = { length: 0 } onChange = (event) => { ... } render() { return (

{this.state.length} chars

) } } 0 chars Abc 3 chars

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0 chars email [email protected] [email protected]

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class TextInput extends React.Component { render() { return ( ) } } email

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Uncontrolled component

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class TextInput extends React.Component { render() { return ( ) } } email SIDDHARTH

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class TextInput extends React.Component { state = { value: '' } render() { return ( ) } } email

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class TextInput extends React.Component { state = { value: '' } render() { return ( ) } } email s

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class TextInput extends React.Component { state = { value: '' } render() { return ( ) } } email s

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class TextInput extends React.Component { state = { value: '' } onChange = (event) => { this.setState({ value: event.target.value.toLowerCase() }) } render() { return ( ) } } email

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class TextInput extends React.Component { state = { value: '' } onChange = (event) => { this.setState({ value: event.target.value.toLowerCase() }) } render() { return ( ) } } email [email protected] [email protected]

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0 chars email [email protected] address

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render( ) address

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render( withLabel(‘address', ) ) address

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const withLabel = (label, Component) => { } render( withLabel(‘address', ) ) address

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const withLabel = (label, Component) => { return (

{label}

) } render( withLabel(‘address', ) ) address

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Higher Order Component

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const withLabel = (label, Component) => { return (

{label}

) } render( withLabel(‘address', ) ) address

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const withLabel = (label, Component) => { return (

{label}

) } render( </WithLabel> ) address

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const WithLabel = (props) => { return (

{label}

) } render( </WithLabel> ) address

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const withLabel = (props) => { return (

{label} {props.children}

) } render( </WithLabel> ) address

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address accept? email

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render( ) email

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render( ) email

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render( </WithLabel> <WithLabel label="accept?"> <Switch /> </WithLabel> </form> ) email

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render( </WithLabel> <WithLabel label="accept?"> <Switch /> </WithLabel> <div className="actions"> <Button primary onClick={this.save}>Save</Button> <Button onClick={this.clear}>Clear</Button> </div> </form> ) email

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address accept? email

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render(

Save Clear

) email

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render( ) email

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Compound Component❤

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compo  compo

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render( ) email

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const Form = (props) => { return ({ props.children }) } email

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const Form = (props) => { return ({ props.children }) } Form.TextInput = props => { return ( ) } email

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const Form = (props) => { return ({ props.children }) } Form.TextInput = props => { return ( ) } Form.TextArea = props => { return ( </WithLabel> email

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render( ) email

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email address accept?

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render( ) email

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email address accept?

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email address accept?

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0 chars

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { this.setState({ length: event.target.value.length }) } render() { return (

{this.state.length} chars

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { const error = event.target.value.length > 30 this.setState({ length: event.target.value.length, error }) } render() { return (

{this.state.length} chars

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { const error = event.target.value.length > this.props.limit this.setState({ length: event.target.value.length, error }) } render() { return (

{this.state.length} chars

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render()

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars 0 chars Abc really long name, omg goes on 28 chars 2/3

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render()

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render()

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render() const renderLabel = (length) => { return {length} chars }

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Render prop

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render() const renderLabel = (length) => { return {length} chars }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { ... } render() const renderLabel = (length) => { let className if (length > 25) className = 'warn' else if (length > 30) className = 'error' return {length} chars }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { ... } render() { return (

{this.state.length} chars

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { ... } render() { return (

{ this.props.renderLabel() }

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { ... } render() { return (

{ this.props.renderLabel(this.state.length) }

) } }

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0 chars PROJECT NAME Abc really long name, omg goes on and on 34 chars class TextInput extends React.Component { constructor(props) { ... } onChange(event) { ... } render() { return ( this.props.render(this.state.length) ) } }

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Save Changes

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Save Changes

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Save Changes

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Save Changes

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render( )

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render( )

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render( )

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Provider Component

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https://avatars3.githubusercontent.com/u/17475736?s=400&v=4 ✅ ✅ ✅

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render( )

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render( )

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render( ) class ThemeProvider extends React.Component { render() { return this.props.children } }

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render( ) class ThemeProvider extends React.Component { getChildContext() { return { theme: this.props.name } } render() { return this.props.children } }

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render( ) class ThemeProvider extends React.Component { getChildContext() { return { theme: this.props.name } } render() { return this.props.children } } ThemeProvider.childContextTypes = { theme: PropTypes.string }

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render( ) class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string }

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render( ) class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } const Button = (props) => { return {props.children} }

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render( ) class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } const Button = (props) => { return {props.children} } Button.contextTypes = { theme: PropTypes.string }

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render( ) class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } const Button = (props, context) => { return {props.children} } Button.contextTypes = { theme: PropTypes.string }

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render( ) class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } const Button = (props, context) => { let className = 'button' + 'button-' + context.theme return {props.children} } Button.contextTypes = { theme: PropTypes.string }

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render( )

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render( )

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class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } const Button = (props, context) => { let className = 'button' + 'button-' + context.theme return {props.children} } Button.contextTypes = { theme: PropTypes.string } render( )

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class ThemeProvider extends React.Component { ... } ThemeProvider.childContextTypes = { theme: PropTypes.string } export function addContext (Component) { Component['contextTypes'] = { theme: PropTypes.string } return Component } ----- const Button = (props, context) => { let className = 'button' + 'button-' + context.theme return {props.children} } addContext(Button)