$(this._element)\n      .removeClass(CLASS_NAME_COLLAPSE)\n      .addClass(CLASS_NAME_COLLAPSING)\n\n    this._element.style[dimension] = 0\n\n    if (this._triggerArray.length) {\n      $(this._triggerArray)\n        .removeClass(CLASS_NAME_COLLAPSED)\n        .attr('aria-expanded', true)\n    }\n\n    this.setTransitioning(true)\n\n    const complete = () => {\n      $(this._element)\n        .removeClass(CLASS_NAME_COLLAPSING)\n        .addClass(`${CLASS_NAME_COLLAPSE} ${CLASS_NAME_SHOW}`)\n\n   ...

  this._parent = element\n    }\n\n    this._settings = $.extend({}, Default, settings)\n  }\n\n  collapse() {\n    this._parent.addClass(CLASS_NAME_COLLAPSING).children(`${SELECTOR_CARD_BODY}, ${SELECTOR_CARD_FOOTER}`)\n      .slideUp(this._settings.animationSpeed, () => {\n        this._parent.addClass(CLASS_NAME_COLLAPSED).removeClass(CLASS_NAME_COLLAPSING)\n      })\n\n    this._parent.find(`> ${SELECTOR_CARD_HEADER} ${this._settings.collapseTrigger} .${this._settings.collapseIcon}`)\n      ...