03-nested-elements.html

<!doctype html>

<title>03 Nested Elements - 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"></script>

<div id="app"></div>

<script type="text/babel">
// Elements can be nested, this results in nested React.createElement
// calls. Writing this without JSX would be pretty tedious
var reactElement = (
  <div className="abc">
    <h1>Hello</h1>
    <h2>world</h2>
  </div>
);

// they can also, like mentioned in lesson 2, contain JavaScript in {}
var myClass = "abc";

function myText() {
  return "world";
}

// JavaScript insertion has the same syntax in attributes as in normal
// text or elements
reactElement = (
  <div className={myClass}>
    <h1>Hello {10 * 10}</h1>
    <h2>{myText()}</h2>
  </div>
);

// this JavaScript can contain elements too
var nestedElement = <h2>world</h2>;

reactElement = (
  <div>
    <h1>Hello</h1>
    {nestedElement}
  </div>
);

// it is also possible to "spread" an object as properties
var properties = {
  className: "abc",
  onClick: function() {
    alert("click");
  }
};

reactElement = (
  <div {...properties}>
    <h1>Hello</h1>
    <h2>world</h2>
  </div>
);

var renderTarget = document.getElementById("app");

ReactDOM.render(reactElement, renderTarget);
</script>