Calendar with HTML, CSS, and JavaScript - How to build calendar using HTML, CSS, and JavaScript

In this tutorial we will learn how to build a fully functional calendar using HTML, CSS, and JavaScript. This tutorial will cover everything you need to know, from creating the basic structure of the calendar to adding functionality for displaying the current date, selecting dates, and adding events.

Source Code:

First, create an HTML file with the name of index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Calendar</title>
    <link rel="stylesheet" href="style.css" />
    <link
      rel="stylesheet"
      href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.13.0/css/all.min.css"
    />
    <link
      href="https://fonts.googleapis.com/css2?family=Quicksand:wght@300;400;500;600;700&display=swap"
      rel="stylesheet"
    />
  </head>
  <body>
    <div class="container">
      <div class="calendar">
        <div class="month">
          <i class="fas fa-angle-left prev"></i>
          <div class="date">
            <h1></h1>
            <p></p>
          </div>
          <i class="fas fa-angle-right next"></i>
        </div>
        <div class="weekdays">
          <div>Sun</div>
          <div>Mon</div>
          <div>Tue</div>
          <div>Wed</div>
          <div>Thu</div>
          <div>Fri</div>
          <div>Sat</div>
        </div>
        <div class="days"></div>
      </div>
    </div>

    <script src="script.js"></script>
  </body>
</html>

Second, create a CSS file with the name of style.css

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Quicksand", sans-serif;
}

html {
  font-size: 62.5%;
}

.container {
  width: 100%;
  height: 100vh;
  background-color: #12121f;
  color: #eee;
  display: flex;
  justify-content: center;
  align-items: center;
}

.calendar {
  width: 45rem;
  height: 52rem;
  background-color: #222227;
  box-shadow: 0 0.5rem 3rem rgba(0, 0, 0, 0.4);
}

.month {
  width: 100%;
  height: 12rem;
  background-color: #167e56;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 2rem;
  text-align: center;
  text-shadow: 0 0.3rem 0.5rem rgba(0, 0, 0, 0.5);
}

.month i {
  font-size: 2.5rem;
  cursor: pointer;
}

.month h1 {
  font-size: 3rem;
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.2rem;
  margin-bottom: 1rem;
}

.month p {
  font-size: 1.6rem;
}

.weekdays {
  width: 100%;
  height: 5rem;
  padding: 0 0.4rem;
  display: flex;
  align-items: center;
}

.weekdays div {
  font-size: 1.5rem;
  font-weight: 400;
  letter-spacing: 0.1rem;
  width: calc(44.2rem / 7);
  display: flex;
  justify-content: center;
  align-items: center;
  text-shadow: 0 0.3rem 0.5rem rgba(0, 0, 0, 0.5);
}

.days {
  width: 100%;
  display: flex;
  flex-wrap: wrap;
  padding: 0.2rem;
}

.days div {
  font-size: 1.4rem;
  margin: 0.3rem;
  width: calc(40.2rem / 7);
  height: 5rem;
  display: flex;
  justify-content: center;
  align-items: center;
  text-shadow: 0 0.3rem 0.5rem rgba(0, 0, 0, 0.5);
  transition: background-color 0.2s;
}

.days div:hover:not(.today) {
  background-color: #262626;
  border: 0.2rem solid #777;
  cursor: pointer;
}

.prev-date,
.next-date {
  opacity: 0.5;
}

.today {
  background-color: #167e56;
}

Third, create a JavaScript file with the name of script.js

const date = new Date();

const renderCalendar = () => {
  date.setDate(1);

  const monthDays = document.querySelector(".days");

  const lastDay = new Date(
    date.getFullYear(),
    date.getMonth() + 1,
    0
  ).getDate();

  const prevLastDay = new Date(
    date.getFullYear(),
    date.getMonth(),
    0
  ).getDate();

  const firstDayIndex = date.getDay();

  const lastDayIndex = new Date(
    date.getFullYear(),
    date.getMonth() + 1,
    0
  ).getDay();

  const nextDays = 7 - lastDayIndex - 1;

  const months = [
    "January",
    "February",
    "March",
    "April",
    "May",
    "June",
    "July",
    "August",
    "September",
    "October",
    "November",
    "December",
  ];

  document.querySelector(".date h1").innerHTML = months[date.getMonth()];

  document.querySelector(".date p").innerHTML = new Date().toDateString();

  let days = "";

  for (let x = firstDayIndex; x > 0; x--) {
    days += `<div class="prev-date">${prevLastDay - x + 1}</div>`;
  }

  for (let i = 1; i <= lastDay; i++) {
    if (
      i === new Date().getDate() &&
      date.getMonth() === new Date().getMonth()
    ) {
      days += `<div class="today">${i}</div>`;
    } else {
      days += `<div>${i}</div>`;
    }
  }

  for (let j = 1; j <= nextDays; j++) {
    days += `<div class="next-date">${j}</div>`;
    monthDays.innerHTML = days;
  }
};

document.querySelector(".prev").addEventListener("click", () => {
  date.setMonth(date.getMonth() - 1);
  renderCalendar();
});

document.querySelector(".next").addEventListener("click", () => {
  date.setMonth(date.getMonth() + 1);
  renderCalendar();
});

renderCalendar();

SOURCE FILES: https://github.com/lashaNoz/Calendar

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#javascript #html #css #web-development