Dark/Light Mode Toggle - JavaScript

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Tue Sep 26 2023 14:02:24 GMT+0000 (Coordinated Universal Time)

/*!
 * Color mode toggler for Bootstrap's docs (https://getbootstrap.com/)
 * Copyright 2011-2023 The Bootstrap Authors
 * Licensed under the Creative Commons Attribution 3.0 Unported License.
 */

(() => {
  'use strict';

  const storedTheme = localStorage.getItem('theme');

  const getPreferredTheme = () => {
    if (storedTheme) {
      return storedTheme;
    }

    return window.matchMedia('(prefers-color-scheme: dark)').matches
      ? 'dark'
      : 'light';
  };

  const setTheme = function (theme) {
    if (
      theme === 'auto' &&
      window.matchMedia('(prefers-color-scheme: dark)').matches
    ) {
      document.documentElement.setAttribute('data-bs-theme', 'dark');
    } else {
      document.documentElement.setAttribute('data-bs-theme', theme);
    }
  };

  setTheme(getPreferredTheme());

  const showActiveTheme = (theme, focus = false) => {
    const themeSwitcher = document.querySelector('#bd-theme');

    if (!themeSwitcher) {
      return;
    }

    const themeSwitcherText = document.querySelector('#bd-theme-text');
    const activeThemeIcon = document.querySelector('.theme-icon-active use');
    const btnToActive = document.querySelector(
      `[data-bs-theme-value="${theme}"]`
    );
    const svgOfActiveBtn = btnToActive
      .querySelector('svg use')
      .getAttribute('href');

    document.querySelectorAll('[data-bs-theme-value]').forEach((element) => {
      element.classList.remove('active');
      element.setAttribute('aria-pressed', 'false');
    });

    btnToActive.classList.add('active');
    btnToActive.setAttribute('aria-pressed', 'true');
    activeThemeIcon.setAttribute('href', svgOfActiveBtn);
    const themeSwitcherLabel = `${themeSwitcherText.textContent} (${btnToActive.dataset.bsThemeValue})`;
    themeSwitcher.setAttribute('aria-label', themeSwitcherLabel);

    if (focus) {
      themeSwitcher.focus();
    }
  };

  window
    .matchMedia('(prefers-color-scheme: dark)')
    .addEventListener('change', () => {
      if (storedTheme !== 'light' || storedTheme !== 'dark') {
        setTheme(getPreferredTheme());
      }
    });

  window.addEventListener('DOMContentLoaded', () => {
    showActiveTheme(getPreferredTheme());

    document.querySelectorAll('[data-bs-theme-value]').forEach((toggle) => {
      toggle.addEventListener('click', () => {
        const theme = toggle.getAttribute('data-bs-theme-value');
        localStorage.setItem('theme', theme);
        setTheme(theme);
        showActiveTheme(theme, true);
      });
    });
  });
})();

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Dark/Light Mode Toggle - JavaScript

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