attach_detach_event_listener

  constructor() {
    this.el = document;
    this.evt = (e) => {
      ...
    }
  }
   
  // Trigger exclusion modal if a click happens anywhere except on the modal box
  this.el.addEventListener('click', this.evt);
   
  // Remove listener once exclusion has been triggered
  this.el.removeEventListener('click', this.evt);