Created
February 14, 2019 13:28
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Preact without JSX + lifecycle methods
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| <!-- Reference: https://github.com/developit/preact-without-babel/ --> | |
| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <style> | |
| #header { | |
| opacity: 1; | |
| transition: opacity 1s; | |
| } | |
| #header.fade { | |
| opacity: 0; | |
| } | |
| </style> | |
| <script> | |
| window.__INITIAL_STATE__ = { hideHeader: false, removeHeader: false }; | |
| </script> | |
| </head> | |
| <body> | |
| <div id="app"></div> | |
| <script src="https://cdn.jsdelivr.net/npm/preact/dist/preact.min.js"></script> | |
| <script> | |
| const { Component, h, render } = window.preact; | |
| const ANIMATION_TIME = 1000; | |
| class App extends Component { | |
| constructor(props) { | |
| super(props); | |
| this.state = __INITIAL_STATE__; | |
| } | |
| componentDidMount() { | |
| this.setState({ message: 'Hello!' }); | |
| setTimeout(() => { | |
| this.setState({ hideHeader: true }); | |
| }, ANIMATION_TIME); | |
| } | |
| componentDidUpdate() { | |
| if ( | |
| this.state.hideHeader === true && | |
| this.state.removeHeader === false | |
| ) { | |
| setTimeout(() => { | |
| this.setState({ removeHeader: true }); | |
| }, ANIMATION_TIME); | |
| } | |
| } | |
| render(props, { message, hideHeader, removeHeader }) { | |
| return h( | |
| 'div', | |
| { id: 'app' }, | |
| removeHeader ? null : h(Header, { message, hideHeader }), | |
| h(Main) | |
| ); | |
| } | |
| } | |
| const Header = ({ message, hideHeader }) => { | |
| return h( | |
| 'header', | |
| { id: 'header', className: hideHeader ? 'fade' : null }, | |
| h('h1', null, 'App'), | |
| message && h('h2', null, message) | |
| ); | |
| }; | |
| class Main extends Component { | |
| componentDidMount() { | |
| console.log('hello'); | |
| } | |
| render() { | |
| const items = [1, 2, 3, 4, 5].map((item, id) => | |
| h('li', { id }, 'Item ' + item) | |
| ); | |
| return h('main', null, h('ul', null, items)); | |
| } | |
| } | |
| render(h(App), document.getElementById('app')); | |
| </script> | |
| </body> | |
| </html> |
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