_slide()

in js/bootstrap.bundle.js [1318:1368]

• 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();
      }
    }