Merge remote-tracking branch 'upstream/dev' into dev

1 files changed, 484 insertions, 398 deletions

diff --git a/vendor/twbs/bootstrap/js/src/carousel.js b/vendor/twbs/bootstrap/js/src/carousel.js
index 62af5cdb1..36176dd9c 100644
--- a/vendor/twbs/bootstrap/js/src/carousel.js
+++ b/vendor/twbs/bootstrap/js/src/carousel.js
@@ -1,520 +1,606 @@
-import $ from 'jquery'
-import Util from './util'
-
 /**
  * --------------------------------------------------------------------------
- * Bootstrap (v4.1.3): carousel.js
+ * Bootstrap (v4.3.1): carousel.js
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * --------------------------------------------------------------------------
  */
 
-const Carousel = (($) => {
-  /**
-   * ------------------------------------------------------------------------
-   * Constants
-   * ------------------------------------------------------------------------
-   */
-
-  const NAME                   = 'carousel'
-  const VERSION                = '4.1.3'
-  const DATA_KEY               = 'bs.carousel'
-  const EVENT_KEY              = `.${DATA_KEY}`
-  const DATA_API_KEY           = '.data-api'
-  const JQUERY_NO_CONFLICT     = $.fn[NAME]
-  const ARROW_LEFT_KEYCODE     = 37 // KeyboardEvent.which value for left arrow key
-  const ARROW_RIGHT_KEYCODE    = 39 // KeyboardEvent.which value for right arrow key
-  const TOUCHEVENT_COMPAT_WAIT = 500 // Time for mouse compat events to fire after touch
-
-  const Default = {
-    interval : 5000,
-    keyboard : true,
-    slide    : false,
-    pause    : 'hover',
-    wrap     : true
-  }
+import $ from 'jquery'
+import Util from './util'
 
-  const DefaultType = {
-    interval : '(number|boolean)',
-    keyboard : 'boolean',
-    slide    : '(boolean|string)',
-    pause    : '(string|boolean)',
-    wrap     : 'boolean'
-  }
+/**
+ * ------------------------------------------------------------------------
+ * Constants
+ * ------------------------------------------------------------------------
+ */
 
-  const Direction = {
-    NEXT     : 'next',
-    PREV     : 'prev',
-    LEFT     : 'left',
-    RIGHT    : 'right'
-  }
+const NAME                   = 'carousel'
+const VERSION                = '4.3.1'
+const DATA_KEY               = 'bs.carousel'
+const EVENT_KEY              = `.${DATA_KEY}`
+const DATA_API_KEY           = '.data-api'
+const JQUERY_NO_CONFLICT     = $.fn[NAME]
+const ARROW_LEFT_KEYCODE     = 37 // KeyboardEvent.which value for left arrow key
+const ARROW_RIGHT_KEYCODE    = 39 // KeyboardEvent.which value for right arrow key
+const TOUCHEVENT_COMPAT_WAIT = 500 // Time for mouse compat events to fire after touch
+const SWIPE_THRESHOLD        = 40
+
+const Default = {
+  interval : 5000,
+  keyboard : true,
+  slide    : false,
+  pause    : 'hover',
+  wrap     : true,
+  touch    : true
+}
+
+const DefaultType = {
+  interval : '(number|boolean)',
+  keyboard : 'boolean',
+  slide    : '(boolean|string)',
+  pause    : '(string|boolean)',
+  wrap     : 'boolean',
+  touch    : 'boolean'
+}
+
+const Direction = {
+  NEXT     : 'next',
+  PREV     : 'prev',
+  LEFT     : 'left',
+  RIGHT    : 'right'
+}
+
+const Event = {
+  SLIDE          : `slide${EVENT_KEY}`,
+  SLID           : `slid${EVENT_KEY}`,
+  KEYDOWN        : `keydown${EVENT_KEY}`,
+  MOUSEENTER     : `mouseenter${EVENT_KEY}`,
+  MOUSELEAVE     : `mouseleave${EVENT_KEY}`,
+  TOUCHSTART     : `touchstart${EVENT_KEY}`,
+  TOUCHMOVE      : `touchmove${EVENT_KEY}`,
+  TOUCHEND       : `touchend${EVENT_KEY}`,
+  POINTERDOWN    : `pointerdown${EVENT_KEY}`,
+  POINTERUP      : `pointerup${EVENT_KEY}`,
+  DRAG_START     : `dragstart${EVENT_KEY}`,
+  LOAD_DATA_API  : `load${EVENT_KEY}${DATA_API_KEY}`,
+  CLICK_DATA_API : `click${EVENT_KEY}${DATA_API_KEY}`
+}
+
+const ClassName = {
+  CAROUSEL      : 'carousel',
+  ACTIVE        : 'active',
+  SLIDE         : 'slide',
+  RIGHT         : 'carousel-item-right',
+  LEFT          : 'carousel-item-left',
+  NEXT          : 'carousel-item-next',
+  PREV          : 'carousel-item-prev',
+  ITEM          : 'carousel-item',
+  POINTER_EVENT : 'pointer-event'
+}
+
+const Selector = {
+  ACTIVE      : '.active',
+  ACTIVE_ITEM : '.active.carousel-item',
+  ITEM        : '.carousel-item',
+  ITEM_IMG    : '.carousel-item img',
+  NEXT_PREV   : '.carousel-item-next, .carousel-item-prev',
+  INDICATORS  : '.carousel-indicators',
+  DATA_SLIDE  : '[data-slide], [data-slide-to]',
+  DATA_RIDE   : '[data-ride="carousel"]'
+}
+
+const PointerType = {
+  TOUCH : 'touch',
+  PEN   : 'pen'
+}
 
-  const Event = {
-    SLIDE          : `slide${EVENT_KEY}`,
-    SLID           : `slid${EVENT_KEY}`,
-    KEYDOWN        : `keydown${EVENT_KEY}`,
-    MOUSEENTER     : `mouseenter${EVENT_KEY}`,
-    MOUSELEAVE     : `mouseleave${EVENT_KEY}`,
-    TOUCHEND       : `touchend${EVENT_KEY}`,
-    LOAD_DATA_API  : `load${EVENT_KEY}${DATA_API_KEY}`,
-    CLICK_DATA_API : `click${EVENT_KEY}${DATA_API_KEY}`
+/**
+ * ------------------------------------------------------------------------
+ * Class Definition
+ * ------------------------------------------------------------------------
+ */
+class Carousel {
+  constructor(element, config) {
+    this._items         = null
+    this._interval      = null
+    this._activeElement = null
+    this._isPaused      = false
+    this._isSliding     = false
+    this.touchTimeout   = null
+    this.touchStartX    = 0
+    this.touchDeltaX    = 0
+
+    this._config            = this._getConfig(config)
+    this._element           = element
+    this._indicatorsElement = this._element.querySelector(Selector.INDICATORS)
+    this._touchSupported    = 'ontouchstart' in document.documentElement || navigator.maxTouchPoints > 0
+    this._pointerEvent      = Boolean(window.PointerEvent || window.MSPointerEvent)
+
+    this._addEventListeners()
   }
 
-  const ClassName = {
-    CAROUSEL : 'carousel',
-    ACTIVE   : 'active',
-    SLIDE    : 'slide',
-    RIGHT    : 'carousel-item-right',
-    LEFT     : 'carousel-item-left',
-    NEXT     : 'carousel-item-next',
-    PREV     : 'carousel-item-prev',
-    ITEM     : 'carousel-item'
+  // Getters
+
+  static get VERSION() {
+    return VERSION
   }
 
-  const Selector = {
-    ACTIVE      : '.active',
-    ACTIVE_ITEM : '.active.carousel-item',
-    ITEM        : '.carousel-item',
-    NEXT_PREV   : '.carousel-item-next, .carousel-item-prev',
-    INDICATORS  : '.carousel-indicators',
-    DATA_SLIDE  : '[data-slide], [data-slide-to]',
-    DATA_RIDE   : '[data-ride="carousel"]'
+  static get Default() {
+    return Default
   }
 
-  /**
-   * ------------------------------------------------------------------------
-   * Class Definition
-   * ------------------------------------------------------------------------
-   */
+  // Public
 
-  class Carousel {
-    constructor(element, config) {
-      this._items              = null
-      this._interval           = null
-      this._activeElement      = null
+  next() {
+    if (!this._isSliding) {
+      this._slide(Direction.NEXT)
+    }
+  }
 
-      this._isPaused           = false
-      this._isSliding          = false
+  nextWhenVisible() {
+    // Don't call next when the page isn't visible
+    // or the carousel or its parent isn't visible
+    if (!document.hidden &&
+      ($(this._element).is(':visible') && $(this._element).css('visibility') !== 'hidden')) {
+      this.next()
+    }
+  }
 
-      this.touchTimeout        = null
+  prev() {
+    if (!this._isSliding) {
+      this._slide(Direction.PREV)
+    }
+  }
 
-      this._config             = this._getConfig(config)
-      this._element            = $(element)[0]
-      this._indicatorsElement  = this._element.querySelector(Selector.INDICATORS)
+  pause(event) {
+    if (!event) {
+      this._isPaused = true
+    }
 
-      this._addEventListeners()
+    if (this._element.querySelector(Selector.NEXT_PREV)) {
+      Util.triggerTransitionEnd(this._element)
+      this.cycle(true)
     }
 
-    // Getters
+    clearInterval(this._interval)
+    this._interval = null
+  }
 
-    static get VERSION() {
-      return VERSION
+  cycle(event) {
+    if (!event) {
+      this._isPaused = false
     }
 
-    static get Default() {
-      return Default
+    if (this._interval) {
+      clearInterval(this._interval)
+      this._interval = null
     }
 
-    // Public
-
-    next() {
-      if (!this._isSliding) {
-        this._slide(Direction.NEXT)
-      }
+    if (this._config.interval && !this._isPaused) {
+      this._interval = setInterval(
+        (document.visibilityState ? this.nextWhenVisible : this.next).bind(this),
+        this._config.interval
+      )
     }
+  }
 
-    nextWhenVisible() {
-      // Don't call next when the page isn't visible
-      // or the carousel or its parent isn't visible
-      if (!document.hidden &&
-        ($(this._element).is(':visible') && $(this._element).css('visibility') !== 'hidden')) {
-        this.next()
-      }
+  to(index) {
+    this._activeElement = this._element.querySelector(Selector.ACTIVE_ITEM)
+
+    const activeIndex = this._getItemIndex(this._activeElement)
+
+    if (index > this._items.length - 1 || index < 0) {
+      return
     }
 
-    prev() {
-      if (!this._isSliding) {
-        this._slide(Direction.PREV)
-      }
+    if (this._isSliding) {
+      $(this._element).one(Event.SLID, () => this.to(index))
+      return
     }
 
-    pause(event) {
-      if (!event) {
-        this._isPaused = true
-      }
+    if (activeIndex === index) {
+      this.pause()
+      this.cycle()
+      return
+    }
 
-      if (this._element.querySelector(Selector.NEXT_PREV)) {
-        Util.triggerTransitionEnd(this._element)
-        this.cycle(true)
-      }
+    const direction = index > activeIndex
+      ? Direction.NEXT
+      : Direction.PREV
 
-      clearInterval(this._interval)
-      this._interval = null
-    }
+    this._slide(direction, this._items[index])
+  }
 
-    cycle(event) {
-      if (!event) {
-        this._isPaused = false
-      }
+  dispose() {
+    $(this._element).off(EVENT_KEY)
+    $.removeData(this._element, DATA_KEY)
+
+    this._items             = null
+    this._config            = null
+    this._element           = null
+    this._interval          = null
+    this._isPaused          = null
+    this._isSliding         = null
+    this._activeElement     = null
+    this._indicatorsElement = null
+  }
 
-      if (this._interval) {
-        clearInterval(this._interval)
-        this._interval = null
-      }
+  // Private
 
-      if (this._config.interval && !this._isPaused) {
-        this._interval = setInterval(
-          (document.visibilityState ? this.nextWhenVisible : this.next).bind(this),
-          this._config.interval
-        )
-      }
+  _getConfig(config) {
+    config = {
+      ...Default,
+      ...config
     }
+    Util.typeCheckConfig(NAME, config, DefaultType)
+    return config
+  }
 
-    to(index) {
-      this._activeElement = this._element.querySelector(Selector.ACTIVE_ITEM)
+  _handleSwipe() {
+    const absDeltax = Math.abs(this.touchDeltaX)
 
-      const activeIndex = this._getItemIndex(this._activeElement)
+    if (absDeltax <= SWIPE_THRESHOLD) {
+      return
+    }
 
-      if (index > this._items.length - 1 || index < 0) {
-        return
-      }
+    const direction = absDeltax / this.touchDeltaX
 
-      if (this._isSliding) {
-        $(this._element).one(Event.SLID, () => this.to(index))
-        return
-      }
+    // swipe left
+    if (direction > 0) {
+      this.prev()
+    }
 
-      if (activeIndex === index) {
-        this.pause()
-        this.cycle()
-        return
-      }
+    // swipe right
+    if (direction < 0) {
+      this.next()
+    }
+  }
 
-      const direction = index > activeIndex
-        ? Direction.NEXT
-        : Direction.PREV
+  _addEventListeners() {
+    if (this._config.keyboard) {
+      $(this._element)
+        .on(Event.KEYDOWN, (event) => this._keydown(event))
+    }
 
-      this._slide(direction, this._items[index])
+    if (this._config.pause === 'hover') {
+      $(this._element)
+        .on(Event.MOUSEENTER, (event) => this.pause(event))
+        .on(Event.MOUSELEAVE, (event) => this.cycle(event))
     }
 
-    dispose() {
-      $(this._element).off(EVENT_KEY)
-      $.removeData(this._element, DATA_KEY)
+    if (this._config.touch) {
+      this._addTouchEventListeners()
+    }
+  }
 
-      this._items             = null
-      this._config            = null
-      this._element           = null
-      this._interval          = null
-      this._isPaused          = null
-      this._isSliding         = null
-      this._activeElement     = null
-      this._indicatorsElement = null
+  _addTouchEventListeners() {
+    if (!this._touchSupported) {
+      return
     }
 
-    // Private
+    const start = (event) => {
+      if (this._pointerEvent && PointerType[event.originalEvent.pointerType.toUpperCase()]) {
+        this.touchStartX = event.originalEvent.clientX
+      } else if (!this._pointerEvent) {
+        this.touchStartX = event.originalEvent.touches[0].clientX
+      }
+    }
 
-    _getConfig(config) {
-      config = {
-        ...Default,
-        ...config
+    const move = (event) => {
+      // ensure swiping with one touch and not pinching
+      if (event.originalEvent.touches && event.originalEvent.touches.length > 1) {
+        this.touchDeltaX = 0
+      } else {
+        this.touchDeltaX = event.originalEvent.touches[0].clientX - this.touchStartX
       }
-      Util.typeCheckConfig(NAME, config, DefaultType)
-      return config
     }
 
-    _addEventListeners() {
-      if (this._config.keyboard) {
-        $(this._element)
-          .on(Event.KEYDOWN, (event) => this._keydown(event))
+    const end = (event) => {
+      if (this._pointerEvent && PointerType[event.originalEvent.pointerType.toUpperCase()]) {
+        this.touchDeltaX = event.originalEvent.clientX - this.touchStartX
       }
 
+      this._handleSwipe()
       if (this._config.pause === 'hover') {
-        $(this._element)
-          .on(Event.MOUSEENTER, (event) => this.pause(event))
-          .on(Event.MOUSELEAVE, (event) => this.cycle(event))
-        if ('ontouchstart' in document.documentElement) {
-          // If it's a touch-enabled device, mouseenter/leave are fired as
-          // part of the mouse compatibility events on first tap - the carousel
-          // would stop cycling until user tapped out of it;
-          // here, we listen for touchend, explicitly pause the carousel
-          // (as if it's the second time we tap on it, mouseenter compat event
-          // is NOT fired) and after a timeout (to allow for mouse compatibility
-          // events to fire) we explicitly restart cycling
-          $(this._element).on(Event.TOUCHEND, () => {
-            this.pause()
-            if (this.touchTimeout) {
-              clearTimeout(this.touchTimeout)
-            }
-            this.touchTimeout = setTimeout((event) => this.cycle(event), TOUCHEVENT_COMPAT_WAIT + this._config.interval)
-          })
+        // If it's a touch-enabled device, mouseenter/leave are fired as
+        // part of the mouse compatibility events on first tap - the carousel
+        // would stop cycling until user tapped out of it;
+        // here, we listen for touchend, explicitly pause the carousel
+        // (as if it's the second time we tap on it, mouseenter compat event
+        // is NOT fired) and after a timeout (to allow for mouse compatibility
+        // events to fire) we explicitly restart cycling
+
+        this.pause()
+        if (this.touchTimeout) {
+          clearTimeout(this.touchTimeout)
         }
+        this.touchTimeout = setTimeout((event) => this.cycle(event), TOUCHEVENT_COMPAT_WAIT + this._config.interval)
       }
     }
 
-    _keydown(event) {
-      if (/input|textarea/i.test(event.target.tagName)) {
-        return
-      }
+    $(this._element.querySelectorAll(Selector.ITEM_IMG)).on(Event.DRAG_START, (e) => e.preventDefault())
+    if (this._pointerEvent) {
+      $(this._element).on(Event.POINTERDOWN, (event) => start(event))
+      $(this._element).on(Event.POINTERUP, (event) => end(event))
 
-      switch (event.which) {
-        case ARROW_LEFT_KEYCODE:
-          event.preventDefault()
-          this.prev()
-          break
-        case ARROW_RIGHT_KEYCODE:
-          event.preventDefault()
-          this.next()
-          break
-        default:
-      }
+      this._element.classList.add(ClassName.POINTER_EVENT)
+    } else {
+      $(this._element).on(Event.TOUCHSTART, (event) => start(event))
+      $(this._element).on(Event.TOUCHMOVE, (event) => move(event))
+      $(this._element).on(Event.TOUCHEND, (event) => end(event))
     }
+  }
 
-    _getItemIndex(element) {
-      this._items = element && element.parentNode
-        ? [].slice.call(element.parentNode.querySelectorAll(Selector.ITEM))
-        : []
-      return this._items.indexOf(element)
+  _keydown(event) {
+    if (/input|textarea/i.test(event.target.tagName)) {
+      return
     }
 
-    _getItemByDirection(direction, activeElement) {
-      const isNextDirection = direction === Direction.NEXT
-      const isPrevDirection = direction === Direction.PREV
-      const activeIndex     = this._getItemIndex(activeElement)
-      const lastItemIndex   = this._items.length - 1
-      const isGoingToWrap   = isPrevDirection && activeIndex === 0 ||
-                              isNextDirection && activeIndex === lastItemIndex
-
-      if (isGoingToWrap && !this._config.wrap) {
-        return activeElement
-      }
-
-      const delta     = direction === Direction.PREV ? -1 : 1
-      const itemIndex = (activeIndex + delta) % this._items.length
-
-      return itemIndex === -1
-        ? this._items[this._items.length - 1] : this._items[itemIndex]
+    switch (event.which) {
+      case ARROW_LEFT_KEYCODE:
+        event.preventDefault()
+        this.prev()
+        break
+      case ARROW_RIGHT_KEYCODE:
+        event.preventDefault()
+        this.next()
+        break
+      default:
     }
+  }
 
-    _triggerSlideEvent(relatedTarget, eventDirectionName) {
-      const targetIndex = this._getItemIndex(relatedTarget)
-      const fromIndex = this._getItemIndex(this._element.querySelector(Selector.ACTIVE_ITEM))
-      const slideEvent = $.Event(Event.SLIDE, {
-        relatedTarget,
-        direction: eventDirectionName,
-        from: fromIndex,
-        to: targetIndex
-      })
+  _getItemIndex(element) {
+    this._items = element && element.parentNode
+      ? [].slice.call(element.parentNode.querySelectorAll(Selector.ITEM))
+      : []
+    return this._items.indexOf(element)
+  }
 
-      $(this._element).trigger(slideEvent)
+  _getItemByDirection(direction, activeElement) {
+    const isNextDirection = direction === Direction.NEXT
+    const isPrevDirection = direction === Direction.PREV
+    const activeIndex     = this._getItemIndex(activeElement)
+    const lastItemIndex   = this._items.length - 1
+    const isGoingToWrap   = isPrevDirection && activeIndex === 0 ||
+                            isNextDirection && activeIndex === lastItemIndex
 
-      return slideEvent
+    if (isGoingToWrap && !this._config.wrap) {
+      return activeElement
     }
 
-    _setActiveIndicatorElement(element) {
-      if (this._indicatorsElement) {
-        const indicators = [].slice.call(this._indicatorsElement.querySelectorAll(Selector.ACTIVE))
-        $(indicators)
-          .removeClass(ClassName.ACTIVE)
+    const delta     = direction === Direction.PREV ? -1 : 1
+    const itemIndex = (activeIndex + delta) % this._items.length
 
-        const nextIndicator = this._indicatorsElement.children[
-          this._getItemIndex(element)
-        ]
+    return itemIndex === -1
+      ? this._items[this._items.length - 1] : this._items[itemIndex]
+  }
 
-        if (nextIndicator) {
-          $(nextIndicator).addClass(ClassName.ACTIVE)
-        }
-      }
-    }
+  _triggerSlideEvent(relatedTarget, eventDirectionName) {
+    const targetIndex = this._getItemIndex(relatedTarget)
+    const fromIndex = this._getItemIndex(this._element.querySelector(Selector.ACTIVE_ITEM))
+    const slideEvent = $.Event(Event.SLIDE, {
+      relatedTarget,
+      direction: eventDirectionName,
+      from: fromIndex,
+      to: targetIndex
+    })
 
-    _slide(direction, element) {
-      const activeElement = this._element.querySelector(Selector.ACTIVE_ITEM)
-      const activeElementIndex = this._getItemIndex(activeElement)
-      const nextElement   = element || activeElement &&
-        this._getItemByDirection(direction, activeElement)
-      const nextElementIndex = this._getItemIndex(nextElement)
-      const isCycling = Boolean(this._interval)
+    $(this._element).trigger(slideEvent)
 
-      let directionalClassName
-      let orderClassName
-      let eventDirectionName
+    return slideEvent
+  }
 
-      if (direction === Direction.NEXT) {
-        directionalClassName = ClassName.LEFT
-        orderClassName = ClassName.NEXT
-        eventDirectionName = Direction.LEFT
-      } else {
-        directionalClassName = ClassName.RIGHT
-        orderClassName = ClassName.PREV
-        eventDirectionName = Direction.RIGHT
-      }
+  _setActiveIndicatorElement(element) {
+    if (this._indicatorsElement) {
+      const indicators = [].slice.call(this._indicatorsElement.querySelectorAll(Selector.ACTIVE))
+      $(indicators)
+        .removeClass(ClassName.ACTIVE)
 
-      if (nextElement && $(nextElement).hasClass(ClassName.ACTIVE)) {
-        this._isSliding = false
-        return
-      }
+      const nextIndicator = this._indicatorsElement.children[
+        this._getItemIndex(element)
+      ]
 
-      const slideEvent = this._triggerSlideEvent(nextElement, eventDirectionName)
-      if (slideEvent.isDefaultPrevented()) {
-        return
-      }
-
-      if (!activeElement || !nextElement) {
-        // Some weirdness is happening, so we bail
-        return
+      if (nextIndicator) {
+        $(nextIndicator).addClass(ClassName.ACTIVE)
       }
+    }
+  }
 
-      this._isSliding = true
+  _slide(direction, element) {
+    const activeElement = this._element.querySelector(Selector.ACTIVE_ITEM)
+    const activeElementIndex = this._getItemIndex(activeElement)
+    const nextElement   = element || activeElement &&
+      this._getItemByDirection(direction, activeElement)
+    const nextElementIndex = this._getItemIndex(nextElement)
+    const isCycling = Boolean(this._interval)
+
+    let directionalClassName
+    let orderClassName
+    let eventDirectionName
+
+    if (direction === Direction.NEXT) {
+      directionalClassName = ClassName.LEFT
+      orderClassName = ClassName.NEXT
+      eventDirectionName = Direction.LEFT
+    } else {
+      directionalClassName = ClassName.RIGHT
+      orderClassName = ClassName.PREV
+      eventDirectionName = Direction.RIGHT
+    }
 
-      if (isCycling) {
-        this.pause()
-      }
+    if (nextElement && $(nextElement).hasClass(ClassName.ACTIVE)) {
+      this._isSliding = false
+      return
+    }
 
-      this._setActiveIndicatorElement(nextElement)
+    const slideEvent = this._triggerSlideEvent(nextElement, eventDirectionName)
+    if (slideEvent.isDefaultPrevented()) {
+      return
+    }
 
-      const slidEvent = $.Event(Event.SLID, {
-        relatedTarget: nextElement,
-        direction: eventDirectionName,
-        from: activeElementIndex,
-        to: nextElementIndex
-      })
+    if (!activeElement || !nextElement) {
+      // Some weirdness is happening, so we bail
+      return
+    }
 
-      if ($(this._element).hasClass(ClassName.SLIDE)) {
-        $(nextElement).addClass(orderClassName)
+    this._isSliding = true
 
-        Util.reflow(nextElement)
+    if (isCycling) {
+      this.pause()
+    }
 
-        $(activeElement).addClass(directionalClassName)
-        $(nextElement).addClass(directionalClassName)
+    this._setActiveIndicatorElement(nextElement)
 
-        const transitionDuration = Util.getTransitionDurationFromElement(activeElement)
+    const slidEvent = $.Event(Event.SLID, {
+      relatedTarget: nextElement,
+      direction: eventDirectionName,
+      from: activeElementIndex,
+      to: nextElementIndex
+    })
 
-        $(activeElement)
-          .one(Util.TRANSITION_END, () => {
-            $(nextElement)
-              .removeClass(`${directionalClassName} ${orderClassName}`)
-              .addClass(ClassName.ACTIVE)
+    if ($(this._element).hasClass(ClassName.SLIDE)) {
+      $(nextElement).addClass(orderClassName)
 
-            $(activeElement).removeClass(`${ClassName.ACTIVE} ${orderClassName} ${directionalClassName}`)
+      Util.reflow(nextElement)
 
-            this._isSliding = false
+      $(activeElement).addClass(directionalClassName)
+      $(nextElement).addClass(directionalClassName)
 
-            setTimeout(() => $(this._element).trigger(slidEvent), 0)
-          })
-          .emulateTransitionEnd(transitionDuration)
+      const nextElementInterval = parseInt(nextElement.getAttribute('data-interval'), 10)
+      if (nextElementInterval) {
+        this._config.defaultInterval = this._config.defaultInterval || this._config.interval
+        this._config.interval = nextElementInterval
       } else {
-        $(activeElement).removeClass(ClassName.ACTIVE)
-        $(nextElement).addClass(ClassName.ACTIVE)
-
-        this._isSliding = false
-        $(this._element).trigger(slidEvent)
+        this._config.interval = this._config.defaultInterval || this._config.interval
       }
 
-      if (isCycling) {
-        this.cycle()
-      }
-    }
+      const transitionDuration = Util.getTransitionDurationFromElement(activeElement)
 
-    // Static
+      $(activeElement)
+        .one(Util.TRANSITION_END, () => {
+          $(nextElement)
+            .removeClass(`${directionalClassName} ${orderClassName}`)
+            .addClass(ClassName.ACTIVE)
 
-    static _jQueryInterface(config) {
-      return this.each(function () {
-        let data = $(this).data(DATA_KEY)
-        let _config = {
-          ...Default,
-          ...$(this).data()
-        }
+          $(activeElement).removeClass(`${ClassName.ACTIVE} ${orderClassName} ${directionalClassName}`)
 
-        if (typeof config === 'object') {
-          _config = {
-            ..._config,
-            ...config
-          }
-        }
+          this._isSliding = false
 
-        const action = typeof config === 'string' ? config : _config.slide
+          setTimeout(() => $(this._element).trigger(slidEvent), 0)
+        })
+        .emulateTransitionEnd(transitionDuration)
+    } else {
+      $(activeElement).removeClass(ClassName.ACTIVE)
+      $(nextElement).addClass(ClassName.ACTIVE)
 
-        if (!data) {
-          data = new Carousel(this, _config)
-          $(this).data(DATA_KEY, data)
-        }
+      this._isSliding = false
+      $(this._element).trigger(slidEvent)
+    }
 
-        if (typeof config === 'number') {
-          data.to(config)
-        } else if (typeof action === 'string') {
-          if (typeof data[action] === 'undefined') {
-            throw new TypeError(`No method named "${action}"`)
-          }
-          data[action]()
-        } else if (_config.interval) {
-          data.pause()
-          data.cycle()
-        }
-      })
+    if (isCycling) {
+      this.cycle()
     }
+  }
 
-    static _dataApiClickHandler(event) {
-      const selector = Util.getSelectorFromElement(this)
+  // Static
 
-      if (!selector) {
-        return
+  static _jQueryInterface(config) {
+    return this.each(function () {
+      let data = $(this).data(DATA_KEY)
+      let _config = {
+        ...Default,
+        ...$(this).data()
       }
 
-      const target = $(selector)[0]
-
-      if (!target || !$(target).hasClass(ClassName.CAROUSEL)) {
-        return
+      if (typeof config === 'object') {
+        _config = {
+          ..._config,
+          ...config
+        }
       }
 
-      const config = {
-        ...$(target).data(),
-        ...$(this).data()
+      const action = typeof config === 'string' ? config : _config.slide
+
+      if (!data) {
+        data = new Carousel(this, _config)
+        $(this).data(DATA_KEY, data)
       }
-      const slideIndex = this.getAttribute('data-slide-to')
 
-      if (slideIndex) {
-        config.interval = false
+      if (typeof config === 'number') {
+        data.to(config)
+      } else if (typeof action === 'string') {
+        if (typeof data[action] === 'undefined') {
+          throw new TypeError(`No method named "${action}"`)
+        }
+        data[action]()
+      } else if (_config.interval && _config.ride) {
+        data.pause()
+        data.cycle()
       }
+    })
+  }
 
-      Carousel._jQueryInterface.call($(target), config)
+  static _dataApiClickHandler(event) {
+    const selector = Util.getSelectorFromElement(this)
 
-      if (slideIndex) {
-        $(target).data(DATA_KEY).to(slideIndex)
-      }
+    if (!selector) {
+      return
+    }
+
+    const target = $(selector)[0]
 
-      event.preventDefault()
+    if (!target || !$(target).hasClass(ClassName.CAROUSEL)) {
+      return
     }
+
+    const config = {
+      ...$(target).data(),
+      ...$(this).data()
+    }
+    const slideIndex = this.getAttribute('data-slide-to')
+
+    if (slideIndex) {
+      config.interval = false
+    }
+
+    Carousel._jQueryInterface.call($(target), config)
+
+    if (slideIndex) {
+      $(target).data(DATA_KEY).to(slideIndex)
+    }
+
+    event.preventDefault()
   }
+}
 
-  /**
-   * ------------------------------------------------------------------------
-   * Data Api implementation
-   * ------------------------------------------------------------------------
-   */
-
-  $(document)
-    .on(Event.CLICK_DATA_API, Selector.DATA_SLIDE, Carousel._dataApiClickHandler)
-
-  $(window).on(Event.LOAD_DATA_API, () => {
-    const carousels = [].slice.call(document.querySelectorAll(Selector.DATA_RIDE))
-    for (let i = 0, len = carousels.length; i < len; i++) {
-      const $carousel = $(carousels[i])
-      Carousel._jQueryInterface.call($carousel, $carousel.data())
-    }
-  })
-
-  /**
-   * ------------------------------------------------------------------------
-   * jQuery
-   * ------------------------------------------------------------------------
-   */
-
-  $.fn[NAME] = Carousel._jQueryInterface
-  $.fn[NAME].Constructor = Carousel
-  $.fn[NAME].noConflict = function () {
-    $.fn[NAME] = JQUERY_NO_CONFLICT
-    return Carousel._jQueryInterface
+/**
+ * ------------------------------------------------------------------------
+ * Data Api implementation
+ * ------------------------------------------------------------------------
+ */
+
+$(document)
+  .on(Event.CLICK_DATA_API, Selector.DATA_SLIDE, Carousel._dataApiClickHandler)
+
+$(window).on(Event.LOAD_DATA_API, () => {
+  const carousels = [].slice.call(document.querySelectorAll(Selector.DATA_RIDE))
+  for (let i = 0, len = carousels.length; i < len; i++) {
+    const $carousel = $(carousels[i])
+    Carousel._jQueryInterface.call($carousel, $carousel.data())
   }
+})
+
+/**
+ * ------------------------------------------------------------------------
+ * jQuery
+ * ------------------------------------------------------------------------
+ */
 
-  return Carousel
-})($)
+$.fn[NAME] = Carousel._jQueryInterface
+$.fn[NAME].Constructor = Carousel
+$.fn[NAME].noConflict = () => {
+  $.fn[NAME] = JQUERY_NO_CONFLICT
+  return Carousel._jQueryInterface
+}
 
 export default Carousel