Method on

docs/app/js/sanddance-app.js:92360–92362

Register an event handler function to be called on `event`

(event, handler, opts)

        }
    }
    /** Register an event handler function to be called on `event` */ on(event, handler, opts) {
        this._addEventHandler(event, handler, opts, false);
    }
    once(event, handler, opts) {
        this._addEventHandler(event, handler, opts, true);
    }