def buildjschart(self):
        """"""
        self.jschart = ''

        # add custom tooltip string in jschart
        # default condition (if build_custom_tooltip is not called explicitly with date_flag=True)
        if self.tooltip_condition_string == '':
            self.tooltip_condition_string = 'var y = String(graph.point.y);\n'

        # Include data
        self.series_js = json.dumps(self.series)