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March 12, 2024 22:37
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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"> | |
| <title>Document</title> | |
| </head> | |
| <body> | |
| <h1 class="title apple-count"></h1> | |
| <p>today I ate <span class="apple-count"></span> apples</p> | |
| <input class="apple-counter-input" type="text" placeholder="number of apples" value="0"> | |
| </body> | |
| <script> | |
| // https://blog.logrocket.com/practical-use-cases-for-javascript-es6-proxies/ | |
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy/Proxy | |
| const $input = document.querySelector('.apple-counter-input') | |
| const $appleCountTextList = document.querySelectorAll('.apple-count') | |
| const myState = { | |
| value: 0, | |
| }; | |
| const myStateHandler = { | |
| set(target, key, value) { | |
| if (!value) { | |
| $appleCountTextList.forEach(el => { | |
| el.textContent = 'no' | |
| }) | |
| return true; | |
| } | |
| $appleCountTextList.forEach(el => { | |
| el.textContent = $input.value | |
| }) | |
| return true; | |
| }, | |
| }; | |
| const proxy1 = new Proxy(myState, myStateHandler); | |
| proxy1.value = myState.value | |
| $input.addEventListener('keyup', (evt) => { | |
| proxy1.value = evt.target.value | |
| }) | |
| </script> | |
| </html> |
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