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main.js
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main.js
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let showErrorMessage = (input, formGroup, formError) => {
formGroup.classList.add('is-invalid');
formError.classList.add('is-active');
input.setAttribute('aria-describedby', formError.getAttribute('id'));
input.setAttribute('aria-invalid', 'true');
input.focus();
};
let showDateErrorMessage = () => {
let inputDay = document.querySelector('#day');
let parent = parentOf(inputDay);
let invalidDate = invalidDateOf(inputDay);
showErrorMessage(inputDay, parent, invalidDate);
let groups = document.querySelectorAll('.form__group + .form__group');
groups.forEach((group) => {
group.classList.add('is-invalid');
});
}
let hideErrorMessage = (input, formGroup, formError) => {
formGroup.classList.remove('is-invalid');
formError.classList.remove('is-active');
input.removeAttribute('aria-describedby');
input.removeAttribute('aria-invalid');
};
let parentOf = (input) => {
let parent = document.querySelector(input.getAttribute('data-parent'));
return parent;
}
let emptyOf = (input) => {
let empty = document.querySelector(input.getAttribute('data-empty'));
return empty;
}
let invalidOf = (input) => {
let invalid = document.querySelector(input.getAttribute('data-invalid'));
return invalid;
}
let invalidDateOf = (input) => {
let invalid = document.querySelector(input.getAttribute('data-invalid-date'));
return invalid;
}
let fadeIn = (output) => {
output.classList.add('fade-in');
};
let fadeOut = (output) => {
output.classList.remove('fade-in');
};
let setOutputDay = (day) => {
let outputDay = document.querySelector('#output-day');
outputDay.innerHTML = day;
fadeIn(outputDay);
}
let setOutputMonth = (month) => {
let outputMonth = document.querySelector('#output-month');
outputMonth.innerHTML = month;
fadeIn(outputMonth);
}
let setOutputYear = (year) => {
let outputYear = document.querySelector('#output-year');
outputYear.innerHTML = year;
fadeIn(outputYear);
}
function calculateAge (year, month, day) {
let currentDate = new Date();
let yearDifference = currentDate.getFullYear() - year;
let monthDifference = (currentDate.getMonth() + 1) - month;
let dayDifference = currentDate.getDate() - day;
let age = {year: yearDifference, month: monthDifference, day: dayDifference};
if (monthDifference >= 0 && dayDifference >= 0) {
return age;
} else if (monthDifference >= 0 && dayDifference < 0) {
age.year -= 1;
age.month = 12 - 1;
age.day = 30 - Math.abs(dayDifference);
return age;
} else if (monthDifference < 0 && dayDifference >= 0) {
age.year -= 1;
age.month = 12 - Math.abs(monthDifference);
return age;
} else {
age.year -= 1;
age.month = 12 - (Math.abs(monthDifference) + 1);
age.day = 30 - Math.abs(dayDifference);
return age;
}
}
class DateValidator {
constructor(input) {
this.input = input;
}
isEmpty () {
let parent = parentOf(this.input);
let empty = emptyOf(this.input);
if (this.input.value.trim().length === 0) {
showErrorMessage(this.input, parent, empty);
this.emptyState = true;
} else {
hideErrorMessage(this.input, parent, empty);
this.emptyState = false;
}
return this;
};
isValid () {
}
verify () {
this.isEmpty();
if (!this.emptyState) {
this.isValid();
}
};
static isValidDay(dayValidator) {
let isValid = () => {
let input = dayValidator.input;
let parent = parentOf(input);
let invalid = invalidOf(input);
let day = Number.parseInt(dayValidator.input.value);
if (!Number.isInteger(day) || day < 1 || day > 31 ) {
showErrorMessage(input, parent, invalid);
dayValidator.validState = false;
} else {
hideErrorMessage(input, parent, invalid);
dayValidator.validState = true;
}
return dayValidator;
};
return isValid;
}
static isValidMonth(monthValidator) {
let isValid = () => {
let input = monthValidator.input;
let parent = parentOf(input);
let invalid = invalidOf(input);
let month = Number.parseInt(input.value);
if (!Number.isInteger(month) || month < 1 || month > 12) {
monthValidator.validState = false;
showErrorMessage(input, parent, invalid);
} else {
monthValidator.validState = true;
hideErrorMessage(input, parent, invalid);
}
return monthValidator;
};
return isValid;
}
static isValidYear (yearValidator) {
let isValid = () => {
let input = yearValidator.input;
let parent = parentOf(input);
let invalid = invalidOf(input);
let year = Number.parseInt(input.value);
let currentYear = new Date().getFullYear();
if (!Number.isInteger(year) || year < 0 || year > currentYear) {
yearValidator.validState = false;
showErrorMessage(input, parent, invalid);
} else {
yearValidator.validState = true;
hideErrorMessage(input, parent, invalid);
}
return yearValidator;
};
return isValid;
}
static isLeapYear (year) {
let isOk = (year % 4 == 0) || (year % 400 == 0);
return isOk;
}
static isFebruary (day, month, year) {
if (DateValidator.isLeapYear(year)) {
return ((month === 2) && (day >= 1 && day <= 29));
} else {
return ((month === 2) && (day >= 1 && day <= 28));
}
}
static hasThirtyDays (day, month) {
if (month === 4 || month === 6 || month === 9 || month === 11) {
return (day >= 1 && day <= 30);
} else {
return true;
}
}
static isAccepted (dayValidator, monthValidator, yearValidator) {
if (!dayValidator.validState ||
!monthValidator.validState ||
!yearValidator.validState
) {
return;
}
let dayInput = dayValidator.input;
let monthInput = monthValidator.input;
let yearInput = yearValidator.input;
let day = Number.parseInt(dayInput.value.trim());
let month = Number.parseInt(monthInput.value.trim());
let year = Number.parseInt(yearInput.value.trim());
let age = calculateAge(year, month, day);
let years = age.year;
let months = age.month;
let days = age.day;
if (years < 0) {
showErrorMessage(yearInput, parentOf(yearInput), invalidOf(yearInput));
return false;
} else if (DateValidator.isFebruary(day, month, year) ||
DateValidator.hasThirtyDays(day, month)) {
hideErrorMessage(dayInput, parentOf(dayInput), invalidDateOf(dayInput));
hideErrorMessage(monthInput, parentOf(monthInput), invalidOf(monthInput));
hideErrorMessage(yearInput, parentOf(yearInput), invalidOf(yearInput));
setOutputDay(days);
setOutputMonth(months);
setOutputYear(years);
return true;
}else {
showDateErrorMessage();
return false;
}
}
}
let calculateAgeButton = document.querySelector('.form__btn');
calculateAgeButton.addEventListener('click', () => {
let dayInput = document.querySelector('#day');
let monthInput = document.querySelector('#month');
let yearInput = document.querySelector('#year');
// show error message when day field is empty or invalid
let dayValidator = new DateValidator(dayInput);
dayValidator.isValid = DateValidator.isValidDay(dayValidator);
dayValidator.verify();
// shows error message when month field is empty or invalid
let monthValidator = new DateValidator(monthInput);
monthValidator.isValid = DateValidator.isValidMonth(monthValidator);
monthValidator.verify();
// shows error message when year field is empty or invalid
let yearValidator = new DateValidator(yearInput);
yearValidator.isValid = DateValidator.isValidYear(yearValidator);
yearValidator.verify();
let isAcceped = DateValidator.isAccepted(dayValidator, monthValidator, yearValidator);
});
let animationendHandler = (event) => {
fadeOut(event.target);
document.querySelector('#day').focus();
};
let outputDay = document.querySelector('#output-day');
outputDay.addEventListener('animationend', animationendHandler);
let outputMonth = document.querySelector('#output-month');
outputMonth.addEventListener('animationend', animationendHandler);
let outputYear = document.querySelector('#output-year');
outputYear.addEventListener('animationend', animationendHandler);