@mdbootstrap/bootstrap-dark-mode/src/js/mdb/util/index.js

Responsive Dark Mode theme built with Bootstrap 5 with Dark Mode toggle button that switches between dark and light themes.

/**
 * --------------------------------------------------------------------------
 * Bootstrap (v5.0.0-beta2): util/index.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
 * --------------------------------------------------------------------------
 */

const MAX_UID = 1000000;
const MILLISECONDS_MULTIPLIER = 1000;
const TRANSITION_END = 'transitionend';

// Shoutout AngusCroll (https://goo.gl/pxwQGp)
const toType = (obj) => {
  if (obj === null || obj === undefined) {
    return `${obj}`;
  }

  return {}.toString
    .call(obj)
    .match(/\s([a-z]+)/i)[1]
    .toLowerCase();
};

/**
 * --------------------------------------------------------------------------
 * Public Util Api
 * --------------------------------------------------------------------------
 */

const getUID = (prefix) => {
  do {
    prefix += Math.floor(Math.random() * MAX_UID);
  } while (document.getElementById(prefix));

  return prefix;
};

const getSelector = (element) => {
  let selector = element.getAttribute('data-mdb-target');

  if (!selector || selector === '#') {
    const hrefAttr = element.getAttribute('href');

    selector = hrefAttr && hrefAttr !== '#' ? hrefAttr.trim() : null;
  }

  return selector;
};

const getSelectorFromElement = (element) => {
  const selector = getSelector(element);

  if (selector) {
    return document.querySelector(selector) ? selector : null;
  }

  return null;
};

const getElementFromSelector = (element) => {
  const selector = getSelector(element);

  return selector ? document.querySelector(selector) : null;
};

const getTransitionDurationFromElement = (element) => {
  if (!element) {
    return 0;
  }

  // Get transition-duration of the element
  let { transitionDuration, transitionDelay } = window.getComputedStyle(element);

  const floatTransitionDuration = Number.parseFloat(transitionDuration);
  const floatTransitionDelay = Number.parseFloat(transitionDelay);

  // Return 0 if element or transition duration is not found
  if (!floatTransitionDuration && !floatTransitionDelay) {
    return 0;
  }

  // If multiple durations are defined, take the first
  transitionDuration = transitionDuration.split(',')[0];
  transitionDelay = transitionDelay.split(',')[0];

  return (
    (Number.parseFloat(transitionDuration) + Number.parseFloat(transitionDelay)) *
    MILLISECONDS_MULTIPLIER
  );
};

const triggerTransitionEnd = (element) => {
  element.dispatchEvent(new Event(TRANSITION_END));
};

const isElement = (obj) => (obj[0] || obj).nodeType;

const emulateTransitionEnd = (element, duration) => {
  let called = false;
  const durationPadding = 5;
  const emulatedDuration = duration + durationPadding;

  function listener() {
    called = true;
    element.removeEventListener(TRANSITION_END, listener);
  }

  element.addEventListener(TRANSITION_END, listener);
  setTimeout(() => {
    if (!called) {
      triggerTransitionEnd(element);
    }
  }, emulatedDuration);
};

const typeCheckConfig = (componentName, config, configTypes) => {
  Object.keys(configTypes).forEach((property) => {
    const expectedTypes = configTypes[property];
    const value = config[property];
    const valueType = value && isElement(value) ? 'element' : toType(value);

    if (!new RegExp(expectedTypes).test(valueType)) {
      throw new Error(
        `${componentName.toUpperCase()}: ` +
          `Option "${property}" provided type "${valueType}" ` +
          `but expected type "${expectedTypes}".`
      );
    }
  });
};

const isVisible = (element) => {
  if (!element) {
    return false;
  }

  if (element.style && element.parentNode && element.parentNode.style) {
    const elementStyle = getComputedStyle(element);
    const parentNodeStyle = getComputedStyle(element.parentNode);

    return (
      elementStyle.display !== 'none' &&
      parentNodeStyle.display !== 'none' &&
      elementStyle.visibility !== 'hidden'
    );
  }

  return false;
};

const findShadowRoot = (element) => {
  if (!document.documentElement.attachShadow) {
    return null;
  }

  // Can find the shadow root otherwise it'll return the document
  if (typeof element.getRootNode === 'function') {
    const root = element.getRootNode();
    return root instanceof ShadowRoot ? root : null;
  }

  if (element instanceof ShadowRoot) {
    return element;
  }

  // when we don't find a shadow root
  if (!element.parentNode) {
    return null;
  }

  return findShadowRoot(element.parentNode);
};

const noop = () => function () {};

const reflow = (element) => element.offsetHeight;

const getjQuery = () => {
  const { jQuery } = window;

  if (jQuery && !document.body.hasAttribute('data-mdb-no-jquery')) {
    return jQuery;
  }

  return null;
};

const onDOMContentLoaded = (callback) => {
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', callback);
  } else {
    callback();
  }
};

const isRTL = document.documentElement.dir === 'rtl';

const array = (collection) => {
  return Array.from(collection);
};

const element = (tag) => {
  return document.createElement(tag);
};

const defineJQueryPlugin = (name, plugin) => {
  onDOMContentLoaded(() => {
    const $ = getjQuery();
    /* istanbul ignore if */
    if ($) {
      const JQUERY_NO_CONFLICT = $.fn[name];
      $.fn[name] = plugin.jQueryInterface;
      $.fn[name].Constructor = plugin;
      $.fn[name].noConflict = () => {
        $.fn[name] = JQUERY_NO_CONFLICT;
        return plugin.jQueryInterface;
      };
    }
  });
};

export {
  getjQuery,
  TRANSITION_END,
  getUID,
  getSelectorFromElement,
  getElementFromSelector,
  getTransitionDurationFromElement,
  triggerTransitionEnd,
  isElement,
  emulateTransitionEnd,
  typeCheckConfig,
  isVisible,
  findShadowRoot,
  noop,
  reflow,
  array,
  element,
  onDOMContentLoaded,
  isRTL,
  defineJQueryPlugin,
};