Created
December 4, 2019 19:38
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Preact hooks example: useReducer, useEffect. No compile step.
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <meta http-equiv="X-UA-Compatible" content="ie=edge"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <section id="root"></section> | |
| <script type="module" crossorigin> | |
| import { h, render } from 'https://unpkg.com/preact@latest?module' | |
| import { useReducer, useEffect } from 'https://unpkg.com/preact@latest/hooks/dist/hooks.module.js?module' | |
| import htm from "https://unpkg.com/htm@latest/dist/htm.module.js?module" | |
| const html = htm.bind(h) | |
| const initialState = 0 | |
| const reducer = (state, action) => { | |
| switch (action) { | |
| case 'increment': return state + 1 | |
| case 'decrement': return state - 1 | |
| case 'reset': return 0 | |
| default: throw new Error('Unknown Action') | |
| } | |
| } | |
| const Counter = () => { | |
| const [count, dispatch] = useReducer(reducer, initialState) | |
| useEffect(() => { | |
| document.title = `Count is ${count}` | |
| }) | |
| const increment = () => dispatch('increment') | |
| const decrement = () => dispatch('decrement') | |
| const reset = () => dispatch('reset') | |
| return html` | |
| <div> | |
| <p>Count: ${count}</p> | |
| <button onclick=${increment}>+</button> | |
| <button onclick=${decrement}>-</button> | |
| <button onclick=${reset}>reset</button> | |
| </div> | |
| ` | |
| } | |
| render(html`<${Counter}/>`, document.getElementById('root')) | |
| </script> | |
| </body> | |
| </html> |
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