Let’s start by creating the structure of our age calculator using HTML. Open your text editor and create a new HTML file.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Age Calculator</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="container">
<h1>Age Calculator</h1>
<div class="form">
<label for="dob">Date of Birth:</label>
<input type="date" id="dob">
<button onclick="calculateAge()">Calculate Age</button>
</div>
<div class="result">
<p>Your age is:</p>
<p id="ageResult">0 years, 0 months, 0 days</p>
</div>
</div>
<script src="script.js"></script>
</body>
</html>
Styling with CSS
To make our age calculator visually appealing, let’s add some CSS to a separate styles.css file. Here’s a simple CSS stylesheet to get you started:
body {
font-family: Arial, sans-serif;
background-color: #f5f5f5;
margin: 0;
display: flex;
justify-content: center;
align-items: center;
height: 100vh;
}
.container {
background-color: #fff;
padding: 20px;
border-radius: 10px;
box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
text-align: center;
}
h1 {
color: #333;
}
.form {
margin: 20px 0;
}
label {
font-weight: bold;
}
input[type="date"] {
padding: 5px;
border: 1px solid #ccc;
border-radius: 5px;
font-size: 16px;
}
button {
background-color: #007BFF;
color: #fff;
border: none;
padding: 10px 20px;
border-radius: 5px;
font-size: 16px;
cursor: pointer;
}
.result {
margin-top: 20px;
font-size: 18px;
}
Calculating Age with JavaScript
Now, let’s add the functionality to calculate the age using JavaScript. Create a script.js file and add the following code:
function calculateAge() {
const dobInput = document.getElementById('dob').value;
const dob = new Date(dobInput);
const currentDate = new Date();
const ageInMilliseconds = currentDate - dob;
const ageInYears = ageInMilliseconds / (365 * 24 * 60 * 60 * 1000);
const age = Math.floor(ageInYears);
currentDate.setFullYear(currentDate.getFullYear() - age);
const monthDiff = currentDate.getMonth() - dob.getMonth();
let months = monthDiff;
if (currentDate.getDate() < dob.getDate()) {
months--;
}
let days = currentDate.getDate() - dob.getDate();
if (days < 0) {
const lastDayOfMonth = new Date(currentDate.getFullYear(), currentDate.getMonth(), 0).getDate();
days = lastDayOfMonth - dob.getDate() + currentDate.getDate();
}
document.getElementById('ageResult').textContent = `${age} years, ${months} months, ${days} days`;
}
Learn more in detail with complete source code with code explanation here: Age Calculator Using HTML, CSS, and JavaScript: A Beginner’s Guide
Top comments (3)
Creating an age calculator using HTML, CSS, and JavaScript is a great project for beginners to understand web development fundamentals. This simple tool allows users to input their birthdate and calculates their exact age by leveraging JavaScript functions for date manipulation. By integrating HTML for structure and CSS for styling, you can build a user-friendly interface that visually presents the age calculate results. Just as an "age calculator" accurately determines age based on specific input data, this guide helps you develop a functional and visually appealing age calculation tool, enhancing your coding skills and understanding of web technologies.
Great tutorial for beginners looking to build an Age Calculator using HTML, CSS, and JavaScript! The step-by-step approach makes it easy to follow, and the styling adds a nice touch. For a more advanced and user-friendly age calculation experience, check out Age Calculator.
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