Krok 11: przycisk Dziś i strzałki na klawiaturze

Kalendarz z elementów DOM - Kalendarz w JavaScript krok po kroku (HTML/CSS/JS)

Przycisk `#today` ustawia stan z powrotem na bieżący miesiąc. Strzałki w lewo i w prawo działają jak przyciski: nasłuchiwacz `keydown` na całym dokumencie sprawdza `e.key` i woła tę samą funkcję `move`. Jedna funkcja, trzy sposoby jej wywołania.

<!DOCTYPE html>
<html lang="pl">
<head>
  <meta charset="utf-8">
  <title>Kalendarz</title>
  <style>
    body { font-family: sans-serif; max-width: 36em; line-height: 1.4; }
    input, select, button, textarea { font: inherit; padding: 0.2em 0.4em; }
    table { border-collapse: collapse; }
    th, td { border: 1px solid #94a3b8; padding: 0.2em 0.6em; }

    #calendar { display: grid; grid-template-columns: repeat(7, 40px); gap: 6px; }
    #calendar div { height: 40px; line-height: 40px; text-align: center; background: lightgrey; }
    #calendar .day-name { background: darkgrey; color: white; }
    #calendar .saturday { background: lightblue; color: white; }
    #calendar .sunday { background: steelblue; color: white; }
    #calendar .none { background: white; }
    #calendar .today { background: crimson; color: white; }
    #calendar .day { cursor: pointer; }
    #calendar .selected { outline: 3px solid #f59e0b; }
    .bar { display: flex; align-items: center; gap: 0.5em; width: 316px; }
    .bar strong { flex: 1; text-align: center; }
    table.cal td, table.cal th { width: 2.2em; text-align: center; }
    table.cal .saturday, table.cal .sunday { color: steelblue; }
    table.cal .today { background: crimson; color: white; }
  </style>
</head>
<body>
  <p class="bar">
    <button id="prev">&lt;</button>
    <strong id="title"></strong>
    <button id="next">&gt;</button>
    <button id="today">Dziś</button>
  </p>
  <div id="calendar"></div>

  <p id="info">Kliknij dzień</p>
  <script>
    const MONTHS = ['styczeń', 'luty', 'marzec', 'kwiecień', 'maj', 'czerwiec',
      'lipiec', 'sierpień', 'wrzesień', 'październik', 'listopad', 'grudzień'];
    const DAY_NAMES = ['Pn', 'Wt', 'Śr', 'Cz', 'Pt', 'So', 'Nd'];
    const WEEKEND = ['', '', '', '', '', 'saturday', 'sunday'];
    function cell(text, ...classes) {
      const div = document.createElement('div');
      div.textContent = text;
      div.classList.add(...classes.filter(Boolean));
      return div;
    }

    const today = new Date();
    const calendar = document.getElementById('calendar');

    function render(year, month) {
      const firstDay = (new Date(year, month - 1, 1).getDay() + 6) % 7;
      const days = new Date(year, month, 0).getDate();
      const fragment = document.createDocumentFragment();
      DAY_NAMES.forEach((name, k) => fragment.append(cell(name, 'day-name', WEEKEND[k])));
      for (let k = 0; k < firstDay; k++) fragment.append(cell('', 'none'));
      for (let i = 1; i <= days; i++) {
        const isToday = year === today.getFullYear() && month === today.getMonth() + 1 && i === today.getDate();
        const div = cell(i, 'day', isToday ? 'today' : WEEKEND[(firstDay + i - 1) % 7]);
        div.dataset.day = i;
        fragment.append(div);
      }
      calendar.replaceChildren(fragment);
      document.getElementById('title').textContent = `${MONTHS[month - 1]} ${year}`;
    }

    let year = today.getFullYear();
    let month = today.getMonth() + 1;

    function move(delta) {
      month += delta;
      if (month > 12) {
        month = 1;
        year++;
      } else if (month < 1) {
        month = 12;
        year--;
      }
      render(year, month);
    }

    const pad = n => String(n).padStart(2, '0');
    calendar.addEventListener('click', e => {
      const div = e.target.closest('.day');
      if (!div) return;
      calendar.querySelector('.selected')?.classList.remove('selected');
      div.classList.add('selected');
      document.getElementById('info').textContent = `Wybrano: ${pad(div.dataset.day)}.${pad(month)}.${year}`;
    });

    document.getElementById('prev').addEventListener('click', () => move(-1));
    document.getElementById('next').addEventListener('click', () => move(1));
    document.getElementById('today').addEventListener('click', () => {
      year = today.getFullYear();
      month = today.getMonth() + 1;
      render(year, month);
    });
    document.addEventListener('keydown', e => {
      if (e.key === 'ArrowLeft') move(-1);
      if (e.key === 'ArrowRight') move(1);
    });
    render(year, month);
  </script>
</body>
</html>

Ładowanie interaktywnego edytora... Jeśli się nie pojawi, włącz JavaScript.

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