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const username = document.getElementById('name')
const username = document.getElementById('password')
const form = document.getElementById('form')
const errorElement = document.getElementById('error')
form.addEventListener('submit', (e) => {
let message = []
if (name.value === '' name.value == null) {
message.push('Name is required')
}
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
function ready() {
var removeCartItemButtons = document.getElementsByClassName('btn-danger')
for (var i = 0; i < removeCartItemButtons.length; i++) {
var button = removeCartItemButtons[i]
button.addEventListener('click', removeCartItem)
}
var quantityInputs = document.getElementsByClassName('cart-quantity-input')
for (var i = 0; i < quantityInputs.length; i++) {
var input = quantityInputs[i]
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="style.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="Trang chủ.css">
<link rel="stylesheet" href="">
<title>Trang chủ</title>
</head>
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">
<!DOCTYPE html>
<html>
<head>
<title>Da Food</title>
<meta name="description" content="This is the description">
<link rel="stylesheet" href="styles.css" />
</head>
<body>
<header class="main-header">
<nav class="nav main-nav">