[Solved]-Isolate a single series on Highcharts line chart-Highcharts

Is this what you want? Fiddle Link

Based on the API you have to add a click handler using legendItemClick to apply to the series.

     plotOptions: {
            series:{
                   events: {
                        legendItemClick: function(event) {
                            if (!this.visible)
                                return true;

                            var seriesIndex = this.index;
                            var series = this.chart.series;

                            for (var i = 0; i < series.length; i++)
                            {
                                if (series[i].index != seriesIndex)
                                {

                                    series[i].visible ? series[i].hide() : series[i].show();
                                } 
                            }

                            return false;
                        }
                   }
             }
        }