| 1 | /** @flow */ |
| 2 | |
| 3 | import * as React from 'react'; |
| 4 | import {Fragment} from 'react'; |
| 5 | import {createPortal} from 'react-dom'; |
| 6 | |
| 7 | export default function Iframe(): React.Node { |
| 8 | return ( |
| 9 | <Fragment> |
| 10 | <h2>Iframe</h2> |
| 11 | <div> |
| 12 | <Frame> |
| 13 | <Greeting /> |
| 14 | </Frame> |
| 15 | </div> |
| 16 | </Fragment> |
| 17 | ); |
| 18 | } |
| 19 | |
| 20 | const iframeStyle = {border: '2px solid #eee', height: 80}; |
| 21 | |
| 22 | // $FlowFixMe[missing-local-annot] |
| 23 | function Frame(props) { |
| 24 | const [element, setElement] = React.useState(null); |
| 25 | |
| 26 | const ref = React.useRef(); |
| 27 | |
| 28 | React.useLayoutEffect(function () { |
| 29 | const iframe = ref.current; |
| 30 | |
| 31 | // $FlowFixMe[constant-condition] |
| 32 | if (iframe) { |
| 33 | const html = ` |
| 34 | <!DOCTYPE html> |
| 35 | <html> |
| 36 | <body> |
| 37 | <div id="root"></div> |
| 38 | </body> |
| 39 | </html> |
| 40 | `; |
| 41 | |
| 42 | const document = iframe.contentDocument; |
| 43 | |
| 44 | document.open(); |
| 45 | document.write(html); |
| 46 | document.close(); |
| 47 | |
| 48 | setElement(document.getElementById('root')); |
| 49 | } |
| 50 | }, []); |
| 51 | |
| 52 | return ( |
| 53 | <Fragment> |
| 54 | <iframe title="Test Iframe" ref={ref} style={iframeStyle} /> |
| 55 | <iframe |
| 56 | title="Secured Iframe" |
| 57 | src="https://example.com" |
| 58 | style={iframeStyle} |
| 59 | /> |
| 60 | |
| 61 | {/* $FlowFixMe[constant-condition] */} |
| 62 | {element ? createPortal(props.children, element) : null} |
| 63 | </Fragment> |
| 64 | ); |
| 65 | } |
| 66 | |
| 67 | function Greeting() { |
| 68 | return ( |
| 69 | <p> |
| 70 | Hello from within an <code><iframe></code>! |
| 71 | </p> |
| 72 | ); |
| 73 | } |