activeID() {
            if (typeof this.timeline_parameters == "undefined") {
                return this.ID();
            }
            else {
                return this.timeline_parameters.timeline[this.progress.current_location].activeID();
            }
        }
// get the ID of the active trial

get the ID of the active trial
get the ID of the active trial
activeID() {
            if (typeof this.timeline_parameters == "undefined") {
                return this.ID();
            }
            else {
                return this.timeline_parameters.timeline[this.progress.current_location].activeID();
            }
        }
activeID ( ) { if ( typeof this . timeline_parameters == "undefined" ) { return this . ID ( ) ; } else { return this . timeline_parameters . timeline [ this . progress . current_location ] . activeID ( ) ; } }
get the ID of the active trial
get the ID of the active trial