/Age-Caculator

A frontend mentor challenge

Primary LanguageJavaScript

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

Note: Delete this note and update the table of contents based on what sections you keep.

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

Links

Built with

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

What I learned

Form Validation and error handling Got a beter understanding of dates

function calcDate() {
  if (isValid) {
    //converting the user input into a birthdate
    let birthDate = `${inputMonth.value}/${inputDay.value}/${inputYear.value}`;
    console.log(birthDate);
    //passing the birthdate and converting it into milliseconds
    let birthdayOBj = new Date(birthDate);
    console.log(birthdayOBj);
    //subtracting the birthdate in milliseconds from the current millisecond
    let age = Date.now() - birthdayOBj;
    console.log(age);
    //changing the millisecond into an actual date
    let ageDate = new Date(age);
    console.log(ageDate);
    //subtracting the actual date
    let ageYear = ageDate.getUTCFullYear() - 1970; //the 1970 is to get the actual age of the perosn if it is
    // not there it would show how many years has passed since 1970
    let ageMonth = ageDate.getUTCMonth();
    let ageDay = ageDate.getDate() - 1;
    ///displaying everythin
    outputDay.textContent = ageDay;
    outputMonth.textContent = ageMonth;
    outputYear.textContent = ageYear;
  } else {
    alert("error");
  }
}

Author