setClickEvent(i, a, n) {
    i.split(",").forEach((u) => {
      this.setClickFun(u, a, n);
    }), this.setClass(i, "clickable");
  }
Called by parser when a click definition is found. Registers an event handler.

@param ids - Comma separated list of ids
@param functionName - Function to be called on click
@param functionArgs - Arguments to be passed to the function