webpack-bootstrap-ui-kit/src/js/ui/dropdown.js

import Events from '../_events'

/*
 * Bootstrap compatible dropdowns without popover library
 *
 * [data-bs-toggle="hover"] - shows/hides dropdown on mouseover/mouseout
 * [data-bs-toggle="dropdown"], .js-dropdown - shows/hides dropdown on click
 *
 */
const DropdownHoverUI = ((window) => {
  const NAME = 'js-dropdown'

  const HideAll = () => {
    // hide others
    document.querySelectorAll('.dropdown-menu').forEach((el, i) => {
      el.classList.remove('show')
    })
  }

  const Toggle = (el) => {
    HideAll()

    el.querySelector('.dropdown-menu').classList.toggle('show')
  }

  const Show = (e) => {
    const el = e.currentTarget
    el.querySelector('.dropdown-menu').classList.add('show')
  }

  const Hide = (e) => {
    const el = e.currentTarget
    el.querySelector('.dropdown-menu').classList.remove('show')
  }

  const init = () => {
    console.log(`${NAME}: init`)

    const clickableEls = document.querySelectorAll(`.${NAME},[data-bs-toggle="dropdown"]`)
    const hoverableEls = document.querySelectorAll('[data-bs-toggle="hover"]')

    const attachHoverEvents = (el) => {
      el.addEventListener('mouseover', Show, false)
      el.addEventListener('mouseout', Hide, false)

      el.classList.add(`${NAME}-active`)
    }

    const attachClickEvents = (el) => {
      el.addEventListener('click', (e) => {
        e.preventDefault()

        const el = e.currentTarget
        const parent = el.closest('.dropdown')
        Toggle(parent)
      })

      el.classList.add(`${NAME}-active`)
    }

    // Hide all for outside clicks
    /* document.addEventListener('click', function (event) {
      const isClickInside = clickableEls.contains(event.target);

      if (!isClickInside) {
        HideAll();
      }
    }); */

    document.addEventListener('click', (event) => {
      let breakPath = false
      const path = event.path || (event.composedPath && event.composedPath())

      if (!path) {
        console.warn('Browser does not provide event path to hide dropdowns on outside click')
      }

      path.forEach((el, i) => {
        if (breakPath) {
          return
        }

        if (el === document) {
          HideAll()
        }

        if (el.classList && el.classList.contains('dropdown-toggle')) {
          breakPath = true
        }
      })
    })

    hoverableEls.forEach((el, i) => {
      const parent = el.closest('.dropdown')
      attachHoverEvents(parent)
    })

    clickableEls.forEach((el, i) => {
      attachClickEvents(el)
    })
  }

  window.addEventListener(`${Events.LODEDANDREADY}`, init)
  window.addEventListener(`${Events.AJAX}`, init)
})(window)

export default DropdownHoverUI