Highcharts Show custom line from legend

Show a custom line and zoom if out of range on charge. Toggle from the TOC

by Bryan McIntosh

HTML

<script src="https://code.highcharts.com/highcharts.js"></script>

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

JavaScript

$(function () {
    // Plot line options for adding
    plotLineOptions = {
        color: '#FF0000',
        id: "plotLineId", 
        width: 2,
        value: 375,
        dashStyle: 'shortdash'
    };
    
    $('#container').highcharts({
        xAxis: {
            categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
        },
				yAxis: {
        plotLines: [
            	plotLineOptions
            ]
        },
        series: [{
            data: [29.9, 71.5, 106.4, 129.2, 144.0, 176.0, 135.6, 148.5, 216.4, 194.1, 95.6, 54.4]
        }, {
            // Series that mimics the plot line
            color: '#FF0000',
            name: 'Lake Flood Zones',
            dashStyle: 'shortdash',
            visible: false,
            marker: {
                //enabled: false,
                //symbol : 'square',radius : 12
                symbol: 'url(https://www.iconspng.com/uploads/flood-io-logo.png)'
            },
            events: {
                legendItemClick: function(e) {
                    if(this.visible) {
                        this.chart.yAxis[0].update({
                            max: null
                        });
                    }
                    else {
                        this.chart.yAxis[0].update({
                            max: 400
                        });
                    }
                }
            }
        }
        ]
    });
});