Add plot when single series

Add plot when single series

by Sanjay

HTML

<script src="http://highcharts.com/js/testing.js"></script>
<script src="https://code.highcharts.com/highcharts.js"></script>
<script src="https://code.highcharts.com/modules/exporting.js"></script>

<div id="container" style="height: 400px"></div>

JavaScript

var chart = new Highcharts.Chart({
    chart: {
        renderTo: 'container'
    },
    xAxis: {
        categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
    },

    plotOptions: {
        series: {
            events: {
            		hide: function(e) {
            				var seriesIndex = this.index;
            				var series = this.chart.series;
            				var visibleSeries = series.filter(
              				s => s.visible
            				);

            				if (visibleSeries.length === 1) {
                        this.yAxis.addPlotLine({
                          color: '#FF0000',
                          width: 2,
                          value: visibleSeries[0].userOptions.max,
                          id: 'p-1'
                      })
                      this.yAxis.addPlotLine({
                      color: '#0000FF',
                          width: 2,
                          value: visibleSeries[0].userOptions.min,
                          id: 'p-2'
                      });
            				} else {
                    this.chart.series.map(s=>{s.yAxis.removePlotLine('p-1');s.yAxis.removePlotLine('p-2');})
                    }
          			},
                show: function(e) {
            				var seriesIndex = this.index;
            				var series = this.chart.series;
            				var visibleSeries = series.filter(
              				s => s.visible
            				);
            				if (visibleSeries.length === 1) {
                        this.yAxis.addPlotLine({
                          color: '#FF0000',
                          width: 2,
                          value: visibleSeries[0].userOptions.max,
                          id: 'p-1'
                      })
                      this.yAxis.addPlotLine({
                      color: '#0000FF',
                          width: 2,
                          value: visibleSeries[0].userOptions.min,
                          id:...