};
L83:
L84:        this.callback = function() { };
L85:
L86:        //some state information
L87:        this.isShowing = false;
L88:        this.leftCalendar = {};
L89:        this.rightCalendar = {};
L90:
L91:        //custom options from user
L92:        if (typeof options !== 'object' || options === null)
L93:            options = {};
L94:
L95:        //allow setting options with data attributes
L96:        //data-api options will be overwritten with custom javascript options
...