build an Age Calculator using Javascript:
Welcome to this article: How to Build an Age Calculator Using Vanilla JavaScript. In this article, I will show you how to create your own age calculator for your website using Vanilla JavaScript. We’ll walk through the steps to design a simple form, implement the JavaScript logic, and style the calculator. By the end, you'll have a functional age calculator that can calculate someone's age based on their birth date.
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Build Your Own Fruit Ninja GameThis straightforward yet effective application determines the difference between the user's entered birthday and the current date in years, months, days, hours, minutes, and seconds. We'll look at handling date manipulation, responsive design, and input validation.
Project Overview:
Users of the program may enter the date of their birth, and when they click the "Calculate" button, the computed difference between the input date and the current date is displayed. This project is beneficial for developers who wish to gain experience with basic form validation, event listeners, and JavaScript Date Objects.Features:
- Confirm that the user entered the date in the right format (DD/MM/YYYY).
- shows the years, months, days, hours, minutes, and seconds that have been computed.
- gives error messages when input is erroneous.
- Mobile-responsive design for multiple screen sizes.
1. HTML Structure
Three input areas for the day, month, and year are included in the basic HTML framework, along with a button that initiates the computation.2. Style using CSS
Using a mobile-first design approach, the interface is kept simple and uncluttered, guaranteeing that the app looks fantastic across all platforms.3. Logic in JavaScript
The main.js file contains the application's logic, where date computations and input validation are done.Validation of Input: We verify that the day, month, and year entered are accurate. Users are unable to enter dates in the future or days that do not exist, for example.
Date Calculation:
We determine the difference between the supplied date and the current date by using the JavaScript Date() object. Even in cases when the birth date is earlier than the current day, we manage days and months to guarantee an accurate presentation.
4. Managing Cases with Edges
The getNoOfDays() method handles edge circumstances like leap years and incorrect months. Additionally, the supplied date must be in the past.Learning Objectives:
- Date Trickery: Master the JavaScript Date object and perform date arithmetic.
- Learn how to handle edge circumstances such as leap years, check form inputs, and generate clear error messages.
- Use CSS media queries in responsive design to make sure your application looks fantastic across a range of devices.
Conclusion
The Year Calculator app is a great project for developers to hone their JavaScript skills. You’ll get hands-on experience working with the Date object, handling form inputs, and building a responsive UI.
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