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05-properties.html
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05-properties.html
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<!doctype html>
<title>05 Properties - React From Zero</title>
<script src="https://unpkg.com/[email protected]/umd/react.development.js"></script>
<script src="https://unpkg.com/[email protected]/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js"></script>
<div id="app"></div>
<script type="text/babel">
// Components, like elements, can use properties, too
function MyComponent(props) {
return (
<div className={props.className}>
<h1>Hello</h1>
<h2>{props.customData}</h2>
</div>
);
}
// Add the defaultProps (function-)property to set the defaults
// if nothing was provided by the user
MyComponent.defaultProps = {
customData: "default-data",
className: "default-class"
};
var reactElement = <MyComponent className="abc" customData="world" />;
// Which also works with an object and the spread (...) operator
var props = {
className: "abc",
customData: "world"
};
reactElement = <MyComponent {...props} />;
// This allows components with dynamic content
var planets = ["earth", "mars", "venus"];
// If an array is used as a "child node" each child needs a unique
// key-property. This map call will return an array of components,
// like this example:
// [
// <MyComponent className="myClass" customData={"earth"} key={0}/>,
// <MyComponent className="myClass" customData={"mars"} key={1}/>,
// <MyComponent className="myClass" customData={"venus"} key={2}/>
// ]
var elements = planets.map(function(planet, index) {
return (
<MyComponent
className="myClass"
customData={planet}
key={index}
/>
);
});
reactElement = <div>{elements}</div>;
var renderTarget = document.getElementById("app");
ReactDOM.render(reactElement, renderTarget);
</script>