show()

in _/js/bootstrap.esm.js [1534:1573]

• 38 lines of code
• 8 McCabe index (conditional complexity)

  show() {
    if (this._isTransitioning || this._isShown()) {
      return;
    }
    let activeChildren = [];

    // find active children
    if (this._config.parent) {
      activeChildren = this._getFirstLevelChildren(SELECTOR_ACTIVES).filter(element => element !== this._element).map(element => Collapse.getOrCreateInstance(element, {
        toggle: false
      }));
    }
    if (activeChildren.length && activeChildren[0]._isTransitioning) {
      return;
    }
    const startEvent = EventHandler.trigger(this._element, EVENT_SHOW$6);
    if (startEvent.defaultPrevented) {
      return;
    }
    for (const activeInstance of activeChildren) {
      activeInstance.hide();
    }
    const dimension = this._getDimension();
    this._element.classList.remove(CLASS_NAME_COLLAPSE);
    this._element.classList.add(CLASS_NAME_COLLAPSING);
    this._element.style[dimension] = 0;
    this._addAriaAndCollapsedClass(this._triggerArray, true);
    this._isTransitioning = true;
    const complete = () => {
      this._isTransitioning = false;
      this._element.classList.remove(CLASS_NAME_COLLAPSING);
      this._element.classList.add(CLASS_NAME_COLLAPSE, CLASS_NAME_SHOW$7);
      this._element.style[dimension] = '';
      EventHandler.trigger(this._element, EVENT_SHOWN$6);
    };
    const capitalizedDimension = dimension[0].toUpperCase() + dimension.slice(1);
    const scrollSize = `scroll${capitalizedDimension}`;
    this._queueCallback(complete, this._element, true);
    this._element.style[dimension] = `${this._element[scrollSize]}px`;
  }