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65 lines
1.7 KiB
HTML
65 lines
1.7 KiB
HTML
<!doctype html>
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<title>05 Properties - 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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<div id="app"></div>
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<script type="text/babel">
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// Components, like elements, can use properties, too
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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 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-data",
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className: "default-class"
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};
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var reactElement = <MyComponent className="abc" customData="world" />;
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// Which also works with an object and the spread (...) operator
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var props = {
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className: "abc",
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customData: "world"
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};
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reactElement = <MyComponent {...props} />;
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// This allows components with dynamic content
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var planets = ["earth", "mars", "venus"];
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// If an array is used as a "child node" each child needs a unique
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// key-property. This map call will return an array of components,
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// like this example:
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// [
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// <MyComponent className="myClass" customData={"earth"} key={0}/>,
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// <MyComponent className="myClass" customData={"mars"} key={1}/>,
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// <MyComponent className="myClass" customData={"venus"} key={2}/>
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// ]
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var elements = planets.map(function(planet, index) {
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return (
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<MyComponent
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className="myClass"
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customData={planet}
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key={index}
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/>
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);
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});
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reactElement = <div>{elements}</div>;
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var renderTarget = document.getElementById("app");
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ReactDOM.render(reactElement, renderTarget);
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</script> |