June 17, 2020
How to Check If Input Box is Empty in Javascript
HTML:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 |
<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <link rel="stylesheet" href="style.css"> </head> <body> <div> <input type="text"> <button>Check</button> <h1>Result</h1> </div> <script src="script.js"></script> </body> </html> |
CSS:
1 2 3 4 5 6 7 8 9 10 11 12 |
body { text-align: center; } input, button { display: inline-block; padding: 10px 20px; } div { display: inline-block; } |
Javascript:
1 2 3 4 5 6 7 8 9 |
let btnCheck = document.querySelector('button'); let input = document.querySelector('input'); let result = document.querySelector('h1'); btnCheck.addEventListener('click', () => { let value = input.value.trim(); result.innerText = value.length == 0 ? 'Empty' : 'Not Empty'; }); |