Dat.Gui FAQ

Accessing object methods and attributes inside an event callback.

Use the following es6 style functions. It will allow accessing all attributes and methods from class that creates the event callback.

class Modules {
  constructor() {
    this.showModel = true;
  }
  addGui(gui) {
    this.showModelControl = gui.add(this, 'showModel').listen();

    this.showModelControl.onChange((showModel) => {
      if (showModel) {
        this.showModel = false;
      } else {
        this.showModel = true;
      }
    });
  }
}