Age calculator | Frontendmentor challenge
Tags: frontendmentor, challenge, agecalculator, css
Published: 2023-08-05 16:18:02

**Introduction:**

An age calculator is a useful tool for determining a person's age based on their birthdate. Whether you're building a website with age restrictions or simply want to offer visitors a convenient way to calculate their age, this step-by-step guide will walk you through the process of creating an age calculator using HTML, CSS, and JavaScript/jQuery.

Table of Contents:

1. Understanding the Purpose of an Age Calculator
2. Setting Up the HTML Structure
3. Styling the Age Calculator with CSS
4. Implementing Age Calculation Using JavaScript/jQuery
5. Adding Error Handling and Validation
6. Displaying the Calculated Age
7. Conclusion

**- Understanding the Purpose of an Age Calculator**
An age calculator is a tool that takes a person's birthdate as input and calculates their current age. It's commonly used on websites that have age restrictions for content or services. For example, an online store selling alcoholic beverages may use an age calculator to verify customers' eligibility.

**- Setting Up the HTML Structure**
Begin by creating the HTML structure for the age calculator. You'll need input fields for day, month, and year, a button to trigger the calculation, and placeholders to display the calculated age. Use appropriate HTML elements and attributes to ensure semantic structure.

**- Styling the Age Calculator with CSS**
Apply CSS styles to enhance the appearance of the age calculator. Use CSS classes to target specific elements, such as input fields and the calculation button. Employ CSS properties to adjust dimensions, colors, borders, and spacing, creating an aesthetically pleasing design.

**- Implementing Age Calculation Using JavaScript/jQuery**
Add interactivity to the age calculator by using JavaScript/jQuery to handle calculations. Attach a click event listener to the calculation button. Retrieve the values from the input fields using jQuery selectors. Calculate the age in years, months, and days based on the entered birthdate and the current date.

**- Adding Error Handling and Validation**
Implement error handling to ensure accurate results. Validate user input to prevent invalid or empty values. Use jQuery to display error messages dynamically and change label colors and input borders to indicate errors. This enhances the user experience and provides clear feedback.

**- Displaying the Calculated Age**
Display the calculated age in the appropriate result placeholders. Use jQuery to update the content of the result elements dynamically. Ensure that the calculated age is accurate and presented clearly to the user.

**- Conclusion**
In this guide, you've learned how to create an age calculator from scratch using HTML, CSS, and JavaScript/jQuery. Building an age calculator is an excellent way to practice your web development skills and enhance your understanding of interactivity. Feel free to customize and expand the calculator's features, such as allowing users to select their birthdate from a calendar or displaying additional information.


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/9y1v6xua9qcehl6t61yk.jpg)

Watch on video : https://youtu.be/UPyNp-SVV4M

Source will be available on : https://github.com/erajamanickam/age-calculator

Live demo : https://age-calculator-challenge-demo.vercel.app/

Codepen : https://codepen.io/erajamanickam/pen/wvQOEQL