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script.js
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script.js
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function calculateAge() {
// Gets the inputs and their values
let check_day = document.getElementById("day");
let check_month = document.getElementById("month");
let check_year = document.getElementById("year");
const birthdateDay = Number(check_day.value);
const birthdateMonth = Number(check_month.value) - 1;
const birthdateYear = Number(check_year.value);
const birthdate = new Date(birthdateYear, birthdateMonth, birthdateDay);
const today = new Date();
// Gets the results along with the years months and days
let res_years = document.querySelector(".result_years");
let res_mounth =document.querySelector(".result_months");
let res_days =document.querySelector(".result_days");
let ageYears = today.getFullYear() - birthdate.getFullYear();
let ageMonths = today.getMonth() - birthdate.getMonth();
let ageDays = today.getDate() - birthdate.getDate();
if (today.getMonth() < birthdate.getMonth() || (today.getMonth() == birthdate.getMonth() && today.getDate() < birthdate.getDate())) {
ageYears--;
ageMonths += 12;
};
if (ageDays < 0) {
ageMonths--;
ageDays += new Date(today.getFullYear(), today.getMonth(), 0).getDate();
};
if (ageMonths < 0) {
ageYears--;
ageMonths += 12;
};
// Conditional that restricts empty numbers or equal to zero.
if ((check_day.value !== "" && check_month.value !== "" && check_year.value !== "") && (birthdateYear <= today.getFullYear() && birthdateYear >= 1901) &&
(check_day.value !== "0" && check_month.value !== "0" && check_year.value !== "0") && (birthdateDay <= 31 && birthdateMonth <= 12) && isDateValid(birthdateDay, Number(check_month.value), birthdateYear)){
res_years.textContent = ageYears;
res_mounth.textContent = ageMonths;
res_days.textContent = ageDays;
res_years.setAttribute( 'style', 'letter-spacing: 0px;');
res_mounth.setAttribute( 'style', 'letter-spacing: 0px;');
res_days.setAttribute( 'style', 'letter-spacing: 0px;');
error1.style.display = 'none';
}
// controls error messages in case the data entered in the inputs is not correct
else{
if (check_day.value == "") {
error1.textContent = 'This field is required';
error1.style.display = 'block';
};
if (check_month.value == "") {
error2.textContent = 'This field is required';
error2.style.display = 'block';
};
if ( check_year.value == "") {
error3.textContent = 'This field is required';
error3.style.display = 'block';
};
};
// controls error messages in case the day does not match the month
if (birthdate.getMonth() !== birthdateMonth) {
error1.textContent = 'Must be a valid day';
error1.style.display = 'block';
}
if ((Number(check_month.value) < 1 || Number(check_month.value) > 12)) {
error1.style.display = 'none';
if (birthdateDay == 0 || birthdateDay > 31) {
error1.textContent = 'Must be a valid day';
error1.style.display = 'block';
}
}
if (birthdateYear > today.getFullYear()) {
error1.style.display = 'none';
if (birthdateDay == 0 || birthdateDay > 31) {
error1.textContent = 'Must be a valid day';
error1.style.display = 'block';
}
}
}
// Functions that throw an error message when an invalid message is entered in the inputs.
let error1 = document.getElementById("error1");
let error2 = document.getElementById("error2");
let error3 = document.getElementById("error3");
let today = new Date();
function validarInput1(input) {
if (input.value.trim() == '') {
error1.textContent = 'This field is required';
error1.style.display = 'block';
}
else if(input.value.trim() == 0 || input.value.trim() > 31){
error1.textContent = 'Must be a valid day';
error1.style.display = 'block';
}
else {
error1.style.display = 'none';
}
}
function validarInput2(input) {
if (input.value.trim() == '') {
error2.textContent = 'This field is required';
error2.style.display = 'block';
}
else if(input.value.trim() == 0 || input.value.trim() > 12){
error2.textContent = 'Must be a valid month';
error2.style.display = 'block';
}
else {
document.getElementById('error2').style.display = 'none';
}
}
function validarInput3(input) {
if (input.value.trim() == '') {
error3.textContent = 'This field is required';
error3.style.display = 'block';
}
else if(input.value.trim() > today.getFullYear()){
error3.textContent = 'Must be in the past';
error3.style.display = 'block';
}
else if(input.value.trim() <= 1900){
error3.textContent = 'Must be in the future';
error3.style.display = 'block';
}
else {
document.getElementById('error3').style.display = 'none';
}
}
// function that checks if the date is valid.
function isDateValid(day, month, year) {
var date = new Date(year, month - 1, day);
return (
date.getFullYear() === year &&
date.getMonth() === month - 1 &&
date.getDate() === day
);
}