sign-view js let popupListeners let obj onPopupShown listener popupLis

// sign-view.js

let popupListeners = [];

let obj = {
  //...
  onPopupShown(listener) {
    popupListeners.push(listener);
  },
  showPopup(popupName) {
  	this.show(popupForm);
    popupListeners.forEach(listener => listener(popupName));
  },
  //...
}
//...