/AgeCalculatorApp

Age Calculator Responsive Web Application based on Date of Birth

Primary LanguageJavaScript

Frontend Mentor - Age Calculator App

Design preview for the Age Calculator App challenge

Welcome! 👋

Frontend Mentor - Age Calculator App Solution

This is a solution to the Age Calculator App Challenge on Frontend Mentor. Frontend Mentor challenges help you improve your coding skills by building realistic projects.

Table of contents

Overview

The challenge

Users should be able to:

  • View an age in years, months, and days after submitting a valid date through the form
  • Receive validation errors if:
    • Any field is empty when the form is submitted
    • The day number is not between 1-31
    • The month number is not between 1-12
    • The year is in the future
    • The date is invalid e.g. 31/04/1991 (there are 30 days in April)
  • View the optimal layout for the interface depending on their device's screen size
  • See hover and focus states for all interactive elements on the page
  • Bonus: See the age numbers animate to their final number when the form is submitted

Screenshot

Mobile Preview

Mobile Preview

Desktop Preview

Desktop Preview

Empty Form Preview

Desktop Preview

Invalid Form Preview

Desktop Preview

Active State Preview

Desktop Preview

Links

My process

Built with

  • Semantic HTML5 markup
  • CSS custom properties
  • Flexbox
  • CSS Grid
  • Mobile-first workflow

What I learned

<!-- Do not autofill the number input using "autocomplete" attribute -->

<input
  autocomplete="off"
  type="number"
  class="poppins-bold"
  id="day"
  name="day"
  placeholder="DD"
/>
/* Targeting the input elements with a specific keyword used in "class" attribute */

input[class~="error"] {
  border-color: var(--light-red);
  outline: none;
}
// Animate the age numbers to their final number when the form is submitted

function animateResult(result, value, animateInterval) {
  clearInterval(animateInterval);

  let count = 0;

  let idInterval = setInterval(function () {
    let output = document.getElementById(result);
    output.innerText = count;
    count++;
    if (count > value) {
      clearInterval(idInterval);
    }
  }, 40);
}

Useful resources

  • Stack Overflow (https://stackoverflow.com/) - This helped me for manipulating DOM by targeting HTML elements using JS with optimised code.

Author