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54 lines
1.6 KiB
HTML
54 lines
1.6 KiB
HTML
<!doctype html>
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<title>06 Property Types - React From Zero</title>
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<script src="https://unpkg.com/react@16.4.0/umd/react.development.js"></script>
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<script src="https://unpkg.com/react-dom@16.4.0/umd/react-dom.development.js"></script>
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<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
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<script src="https://unpkg.com/prop-types@15.6.1/prop-types.js">
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// PropTypes were removed from React 16 and are now their own package
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</script>
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<div id="app"></div>
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<script type="text/babel">
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// Components get created to encapsulate stuff that should be together in one
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// place and for reuse.
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// Reuse requires the user of the component to supply the correct properties so
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// we can define a type of each property and set defaults
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function MyComponent(props) {
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return (
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<div className={props.className}>
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<h1>Hello</h1>
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<h2>{props.customData}</h2>
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</div>
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)
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}
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// Add the propTypes (function-)property to the component function
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// to let it validate its (element-)properties
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MyComponent.propTypes = {
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// React supplies us with a bunch of types, like string
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customData: PropTypes.string,
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}
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// Add defaultProps (function-)property to set the defaults
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// if nothing was provided by the user
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MyComponent.defaultProps = {
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customData: "default",
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className: "default-class",
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}
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// This will show a warning in the console, because customData should be a string
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var reactElement = <MyComponent customData={123}/>
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// This will use the defaults
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reactElement = <MyComponent/>
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var renderTarget = document.getElementById("app")
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ReactDOM.render(reactElement, renderTarget)
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</script>
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