_slide()

in applications/clouddemo/net4/CloudDemo.Mvc/Scripts/bootstrap.bundle.js [1510:1574]
49 lines of code
10 McCabe index (conditional complexity)

    _slide(order, element = null) {
      if (this._isSliding) {
        return;
      }

      const activeElement = this._getActive();

      const isNext = order === ORDER_NEXT;
      const nextElement = element || getNextActiveElement(this._getItems(), activeElement, isNext, this._config.wrap);

      if (nextElement === activeElement) {
        return;
      }

      const nextElementIndex = this._getItemIndex(nextElement);

      const triggerEvent = eventName => {
        return EventHandler.trigger(this._element, eventName, {
          relatedTarget: nextElement,
          direction: this._orderToDirection(order),
          from: this._getItemIndex(activeElement),
          to: nextElementIndex
        });
      };

      const slideEvent = triggerEvent(EVENT_SLIDE);

      if (slideEvent.defaultPrevented) {
        return;
      }

      if (!activeElement || !nextElement) {
        // Some weirdness is happening, so we bail
        // todo: change tests that use empty divs to avoid this check
        return;
      }

      const isCycling = Boolean(this._interval);
      this.pause();
      this._isSliding = true;

      this._setActiveIndicatorElement(nextElementIndex);

      this._activeElement = nextElement;
      const directionalClassName = isNext ? CLASS_NAME_START : CLASS_NAME_END;
      const orderClassName = isNext ? CLASS_NAME_NEXT : CLASS_NAME_PREV;
      nextElement.classList.add(orderClassName);
      reflow(nextElement);
      activeElement.classList.add(directionalClassName);
      nextElement.classList.add(directionalClassName);

      const completeCallBack = () => {
        nextElement.classList.remove(directionalClassName, orderClassName);
        nextElement.classList.add(CLASS_NAME_ACTIVE$2);
        activeElement.classList.remove(CLASS_NAME_ACTIVE$2, orderClassName, directionalClassName);
        this._isSliding = false;
        triggerEvent(EVENT_SLID);
      };

      this._queueCallback(completeCallBack, activeElement, this._isAnimated());

      if (isCycling) {
        this.cycle();
      }
    }