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02-jsx.html
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<!doctype html>
<title>02 JSX - React From Zero</title>
<script src="https://unpkg.com/react@16.4.0/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16.4.0/umd/react-dom.development.js"></script>
<script src="https://unpkg.com/@babel/standalone/babel.min.js">
// Now we will use JSX, which needs to be converted to JavaScript.
// For this we will use Babel. Babel is normally used to convert ES2015 to ES5, but
// it also can convert JSX to ES5. Babels browser version uses text/babel script tags.
</script>
<div id="app"></div>
<script type="text/babel">
// JSX is the idiomatic way of creating elements.
// It's basically XHTML with {} for dynamic content
// also class has to be called className
var reactElement =
<h1
className="abc"
style={{textAlign: "center"}}
onClick={function() { alert("click") }}>
Hello, world!
</h1>
// Is the same as
reactElement =
React.createElement(
"h1",
{className: "abc", style: {textAlign: "center"},
onClick: function() { alert("click") }},
"Hello, world!"
)
// JSX shines especially with simple elements that make up the majority
var anotherElement = <p>A nice text paragraph.</p>
// Is the same as
anotherElement = React.createElement("p", null, "A nice text paragraph.")
// As we can see, everything else works as before
var renderTarget = document.getElementById("app")
ReactDOM.render(reactElement, renderTarget)
</script>