Bootstrap/js/src/modal.js

import Util from './util'


/**
 * --------------------------------------------------------------------------
 * Bootstrap (v4.0.0): modal.js
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * --------------------------------------------------------------------------
 */

const Modal = (($) => {


  /**
   * ------------------------------------------------------------------------
   * Constants
   * ------------------------------------------------------------------------
   */

  const NAME                         = 'modal'
  const VERSION                      = '4.0.0'
  const DATA_KEY                     = 'bs.modal'
  const JQUERY_NO_CONFLICT           = $.fn[NAME]
  const TRANSITION_DURATION          = 300
  const BACKDROP_TRANSITION_DURATION = 150

  const Default = {
    backdrop : true,
    keyboard : true,
    show     : true
  }

  const Event = {
    HIDE      : 'hide.bs.modal',
    HIDDEN    : 'hidden.bs.modal',
    SHOW      : 'show.bs.modal',
    SHOWN     : 'shown.bs.modal',
    DISMISS   : 'click.dismiss.bs.modal',
    KEYDOWN   : 'keydown.dismiss.bs.modal',
    FOCUSIN   : 'focusin.bs.modal',
    RESIZE    : 'resize.bs.modal',
    CLICK     : 'click.bs.modal.data-api',
    MOUSEDOWN : 'mousedown.dismiss.bs.modal',
    MOUSEUP   : 'mouseup.dismiss.bs.modal'
  }

  const ClassName = {
    BACKDROP : 'modal-backdrop',
    OPEN     : 'modal-open',
    FADE     : 'fade',
    IN       : 'in'
  }

  const Selector = {
    DIALOG             : '.modal-dialog',
    DATA_TOGGLE        : '[data-toggle="modal"]',
    DATA_DISMISS       : '[data-dismiss="modal"]',
    SCROLLBAR_MEASURER : 'modal-scrollbar-measure'
  }


  /**
   * ------------------------------------------------------------------------
   * Class Definition
   * ------------------------------------------------------------------------
   */

  class Modal {

    constructor(element, config) {
      this._config              = config
      this._element             = element
      this._dialog              = $(element).find(Selector.DIALOG)[0]
      this._backdrop            = null
      this._isShown             = false
      this._isBodyOverflowing   = false
      this._ignoreBackdropClick = false
      this._originalBodyPadding = 0
      this._scrollbarWidth      = 0
    }


    // getters

    static get VERSION() {
      return VERSION
    }

    static get Default() {
      return Default
    }


    // public

    toggle(relatedTarget) {
      return this._isShown ? this.hide() : this.show(relatedTarget)
    }

    show(relatedTarget) {
      let showEvent = $.Event(Event.SHOW, {
        relatedTarget: relatedTarget
      })

      $(this._element).trigger(showEvent)

      if (this._isShown || showEvent.isDefaultPrevented()) {
        return
      }

      this._isShown = true

      this._checkScrollbar()
      this._setScrollbar()

      $(document.body).addClass(ClassName.OPEN)

      this._setEscapeEvent()
      this._setResizeEvent()

      $(this._element).on(
        Event.DISMISS,
        Selector.DATA_DISMISS,
        this.hide.bind(this)
      )

      $(this._dialog).on(Event.MOUSEDOWN, () => {
        $(this._element).one(Event.MOUSEUP, (event) => {
          if ($(event.target).is(this._element)) {
            that._ignoreBackdropClick = true
          }
        })
      })

      this._showBackdrop(
        this._showElement.bind(this, relatedTarget)
      )
    }

    hide(event) {
      if (event) {
        event.preventDefault()
      }

      let hideEvent = $.Event(Event.HIDE)

      $(this._element).trigger(hideEvent)

      if (!this._isShown || hideEvent.isDefaultPrevented()) {
        return
      }

      this._isShown = false

      this._setEscapeEvent()
      this._setResizeEvent()

      $(document).off(Event.FOCUSIN)

      $(this._element).removeClass(ClassName.IN)

      $(this._element).off(Event.DISMISS)
      $(this._dialog).off(Event.MOUSEDOWN)

      if (Util.supportsTransitionEnd() &&
         ($(this._element).hasClass(ClassName.FADE))) {

        $(this._element)
          .one(Util.TRANSITION_END, this._hideModal.bind(this))
          .emulateTransitionEnd(TRANSITION_DURATION)
      } else {
        this._hideModal()
      }
    }


    // private

    _showElement(relatedTarget) {
      let transition = Util.supportsTransitionEnd() &&
        $(this._element).hasClass(ClassName.FADE)

      if (!this._element.parentNode ||
         (this._element.parentNode.nodeType !== Node.ELEMENT_NODE)) {
        // don't move modals dom position
        document.body.appendChild(this._element)
      }

      this._element.style.display = 'block'
      this._element.scrollTop = 0

      if (transition) {
        Util.reflow(this._element)
      }

      $(this._element).addClass(ClassName.IN)

      this._enforceFocus()

      let shownEvent = $.Event(Event.SHOWN, {
        relatedTarget: relatedTarget
      })

      let transitionComplete = () => {
        this._element.focus()
        $(this._element).trigger(shownEvent)
      }

      if (transition) {
        $(this._dialog)
          .one(Util.TRANSITION_END, transitionComplete)
          .emulateTransitionEnd(TRANSITION_DURATION)
      } else {
        transitionComplete()
      }
    }

    _enforceFocus() {
      $(document)
        .off(Event.FOCUSIN) // guard against infinite focus loop
        .on(Event.FOCUSIN, (event) => {
          if (this._element !== event.target &&
             (!$(this._element).has(event.target).length)) {
            this._element.focus()
          }
        })
    }

    _setEscapeEvent() {
      if (this._isShown && this._config.keyboard) {
        $(this._element).on(Event.KEYDOWN, (event) => {
          if (event.which === 27) {
            this.hide()
          }
        })

      } else if (!this._isShown) {
        $(this._element).off(Event.KEYDOWN)
      }
    }

    _setResizeEvent() {
      if (this._isShown) {
        $(window).on(Event.RESIZE, this._handleUpdate.bind(this))
      } else {
        $(window).off(Event.RESIZE)
      }
    }

    _hideModal() {
      this._element.style.display = 'none'
      this._showBackdrop(() => {
        $(document.body).removeClass(ClassName.OPEN)
        this._resetAdjustments()
        this._resetScrollbar()
        $(this._element).trigger(Event.HIDDEN)
      })
    }

    _removeBackdrop() {
      if (this._backdrop) {
        $(this._backdrop).remove()
        this._backdrop = null
      }
    }

    _showBackdrop(callback) {
      let animate = $(this._element).hasClass(ClassName.FADE) ?
        ClassName.FADE : ''

      if (this._isShown && this._config.backdrop) {
        let doAnimate = Util.supportsTransitionEnd() && animate

        this._backdrop = document.createElement('div')
        this._backdrop.className = ClassName.BACKDROP

        if (animate) {
          $(this._backdrop).addClass(animate)
        }

        $(this._backdrop).appendTo(this.$body)

        $(this._element).on(Event.DISMISS, (event) => {
          if (this._ignoreBackdropClick) {
            this._ignoreBackdropClick = false
            return
          }
          if (event.target !== event.currentTarget) {
            return
          }
          if (this._config.backdrop === 'static') {
            this._element.focus()
          } else {
            this.hide()
          }
        })

        if (doAnimate) {
          Util.reflow(this._backdrop)
        }

        $(this._backdrop).addClass(ClassName.IN)

        if (!callback) {
          return
        }

        if (!doAnimate) {
          callback()
          return
        }

        $(this._backdrop)
          .one(Util.TRANSITION_END, callback)
          .emulateTransitionEnd(BACKDROP_TRANSITION_DURATION)

      } else if (!this._isShown && this._backdrop) {
        $(this._backdrop).removeClass(ClassName.IN)

        let callbackRemove = () => {
          this._removeBackdrop()
          if (callback) {
            callback()
          }
        }

        if (Util.supportsTransitionEnd() &&
           ($(this._element).hasClass(ClassName.FADE))) {
          $(this._backdrop)
            .one(Util.TRANSITION_END, callbackRemove)
            .emulateTransitionEnd(BACKDROP_TRANSITION_DURATION)
        } else {
          callbackRemove()
        }

      } else if (callback) {
        callback()
      }
    }


    // ----------------------------------------------------------------------
    // the following methods are used to handle overflowing modals
    // todo (fat): these should probably be refactored out of modal.js
    // ----------------------------------------------------------------------

    _handleUpdate() {
      this._adjustDialog()
    }

    _adjustDialog() {
      let isModalOverflowing =
        this._element.scrollHeight > document.documentElement.clientHeight

      if (!this._isBodyOverflowing && isModalOverflowing) {
        this._element.style.paddingLeft = this._scrollbarWidth + 'px'
      }

      if (this._isBodyOverflowing && !isModalOverflowing) {
        this._element.style.paddingRight = this._scrollbarWidth + 'px'
      }
    }

    _resetAdjustments() {
      this._element.style.paddingLeft = ''
      this._element.style.paddingRight = ''
    }

    _checkScrollbar() {
      let fullWindowWidth = window.innerWidth
      if (!fullWindowWidth) { // workaround for missing window.innerWidth in IE8
        let documentElementRect = document.documentElement.getBoundingClientRect()
        fullWindowWidth =
          documentElementRect.right - Math.abs(documentElementRect.left)
      }
      this._isBodyOverflowing = document.body.clientWidth < fullWindowWidth
      this._scrollbarWidth = this._getScrollbarWidth()
    }

    _setScrollbar() {
      let bodyPadding = parseInt(
        $(document.body).css('padding-right') || 0,
        10
      )

      this._originalBodyPadding = document.body.style.paddingRight || ''

      if (this._isBodyOverflowing) {
        document.body.style.paddingRight =
          bodyPadding + this._scrollbarWidth + 'px'
      }
    }

    _resetScrollbar() {
      document.body.style.paddingRight = this._originalBodyPadding
    }

    _getScrollbarWidth() { // thx d.walsh
      let scrollDiv = document.createElement('div')
      scrollDiv.className = Selector.SCROLLBAR_MEASURER
      document.body.appendChild(scrollDiv)
      let scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth
      document.body.removeChild(scrollDiv)
      return scrollbarWidth
    }


    // static

    static _jQueryInterface(config, relatedTarget) {
      return this.each(function () {
        let data    = $(this).data(DATA_KEY)
        let _config = $.extend(
          {},
          Modal.Default,
          $(this).data(),
          typeof config === 'object' && config
        )

        if (!data) {
          data = new Modal(this, _config)
          $(this).data(DATA_KEY, data)
        }

        if (typeof config === 'string') {
          data[config](relatedTarget)

        } else if (_config.show) {
          data.show(relatedTarget)
        }
      })
    }

  }


  /**
   * ------------------------------------------------------------------------
   * Data Api implementation
   * ------------------------------------------------------------------------
   */

  $(document).on(Event.CLICK, Selector.DATA_TOGGLE, function (event) {
    let target
    let selector = Util.getSelectorFromElement(this)

    if (selector) {
      target = $(selector)[0]
    }

    let config = $(target).data(DATA_KEY) ?
      'toggle' : $.extend({}, $(target).data(), $(this).data())

    if (this.tagName === 'A') {
      event.preventDefault()
    }

    let $target = $(target).one(Event.SHOW, (showEvent) => {
      if (showEvent.isDefaultPrevented()) {
        // only register focus restorer if modal will actually get shown
        return
      }

      $target.one(Event.HIDDEN, () => {
        if ($(this).is(':visible')) {
          this.focus()
        }
      })
    })

    Modal._jQueryInterface.call($(target), config, this)
  })


  /**
   * ------------------------------------------------------------------------
   * jQuery
   * ------------------------------------------------------------------------
   */

  $.fn[NAME]             = Modal._jQueryInterface
  $.fn[NAME].Constructor = Modal
  $.fn[NAME].noConflict  = function () {
    $.fn[NAME] = JQUERY_NO_CONFLICT
    return Modal._jQueryInterface
  }

  return Modal

})(jQuery)

export default Modal