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Introduction to React.js Max Stoiber @mxstbr Open Source Developer, Thinkmill

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React

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The V in MVC

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The V in MVC

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The Vanilla in MVC

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Why does React exist?

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Instagram

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Rendering on the server?

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Rendering on the client!

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Dynamic Interfaces

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Dynamic Interfaces ≈ Better UX

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Dynamic Interfaces are hard

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React makes Dynamic Interfaces easy

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How does React work?

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React creates components

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Render those components on the web, on native, in VR,…

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Write once, run anywhere?

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⚠ Write once, run anywhere? ⚠

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Learn once, write anywhere!

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Let’s talk about components

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Header SearchResults

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SearchResults Logo SearchBar TabNav AppsToggle Btn

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SearchResults Input SearchIcon Tab Tab Tab Tab Tab Toggle Tgl Tgl

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Components in React

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React.createElement()

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React.createElement('div') // will render this w/ ReactDOM

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React.createElement('h1') // will render this w/ ReactDOM

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React.createElement('input') // will render this w/ ReactDOM

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React.createElement('input', { type: 'radio' }) // will render this w/ ReactDOM

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React.createElement('h1') // will render this w/ ReactDOM

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React.createElement('h1', { className: 'heading' }) // will render this w/ ReactDOM

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React.createElement('h1', { className: 'heading' }, 'Hello World') // will render this w/ ReactDOM

Hello World

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React.createElement('div', null, React.createElement('h1', { className: 'heading' }, 'Hello World') ) // will render this w/ ReactDOM

Hello World

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React.createElement('div', { className: 'wrapper' }, React.createElement('h1', { className: 'heading' }, 'Hello World') ) // will render this w/ ReactDOM

Hello World

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const Wrapper = function (props) { return React.createElement('div', { className: 'wrapper' }) } React.createElement(Wrapper, null, React.createElement('h1', { className: 'heading' }, 'Hello World') ) // will render this w/ ReactDOM

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const Wrapper = function (props) { return React.createElement('div', { className: 'wrapper' }, props.children) } React.createElement(Wrapper, null, React.createElement('h1', { className: 'heading' }, 'Hello World') ) // will render this w/ ReactDOM

Hello World

Component!

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Rendering the whole DOM is slow

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React Elements are representation of the DOM

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React.createElement('h1', { className: 'heading' }, 'Hello World') // will return something like { type: 'h1', props: { className: 'heading' }, children: ['Hello World'] }

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React.createElement(Wrapper, null, React.createElement('h1', { className: 'heading' }, 'Hello World') ) // will return something like { type: Wrapper, props: null, children: [{ type: 'h1', props: { className: 'heading' }, children: ['Hello World'] }] }

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Every tick calculate the changes

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Every tick calculate the changes (that's quick, because objects)

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// Before { type: 'h1', props: { className: 'heading' }, children: ['Hello World'] }

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// After { type: 'h1', props: { className: 'heading' }, children: ['This is new'] }

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// After { type: 'h1', props: { className: 'heading' }, children: ['This is new'] } // Before { type: 'h1', props: { className: 'heading' }, children: ['Hello World'] }

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// After { type: 'h1', props: { className: 'heading' }, children: ['This is new'] } // Before { type: 'h1', props: { className: 'heading' }, children: ['Hello World'] } // What changed?

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// After { type: 'h1', props: { className: 'heading' }, children: ['This is new'] } // Before { type: 'h1', props: { className: 'heading' }, children: ['Hello World'] } // What changed?

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Only render changes to the DOM!

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JSX

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Hello World

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const Wrapper = function (props) { return React.createElement('div', { className: 'wrapper' }, props.children) } React.createElement(Wrapper, null,

Hello World

) // will render this w/ ReactDOM

Hello World

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const Wrapper = function (props) { return

{ props.children }

} React.createElement(Wrapper, null,

Hello World

) // will render this w/ ReactDOM

Hello World

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const Wrapper = function (props) { return

{ props.children }

}

Hello World

// will render this w/ ReactDOM

Hello World

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Hello World

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const Wrapper = function (props) { return

{ props.children }

}

Hello World

// will render this w/ ReactDOM

Hello World

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No content

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mxs.is/mstsreact

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