Highcharts Demo

author(s): Torstein Hønsi

HTML

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

<div id="container"></div>
<button id="button" class="autocompare highcharts-demo-button">Add plot line</button>

CSS

#container {
    height: 400px;
}

.highcharts-demo-button {
    background: var(--highcharts-neutral-color-5, #f2f2f2);
    border: none;
    border-radius: 4px;
    color: var(--highcharts-neutral-color-100, #000);
    cursor: pointer;
    display: inline-block;
    font-size: 0.8rem;
    padding: 0.5rem 1.5rem;
    margin: 0.5rem -5px 0.5rem 10px;
    transition: background 250ms;
}

.highcharts-demo-button:hover {
    background: var(--highcharts-neutral-color-10, #e6e6e6);
}

JavaScript

const chart = Highcharts.chart('container', {
    xAxis: {
        categories: [
            'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep',
            'Oct', 'Nov', 'Dec'
        ]
    },
    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
        ]
    }]
});

let hasPlotLine = false;

document.getElementById('button').addEventListener('click', e => {
    if (!hasPlotLine) {
        chart.xAxis[0].addPlotLine({
            value: 5.5,
            color: 'red',
            width: 2,
            id: 'plot-line-1'
        });
        e.target.innerHTML = 'Remove plot line';
    } else {
        chart.xAxis[0].removePlotLine('plot-line-1');
        e.target.innerHTML = 'Add plot line';
    }
    hasPlotLine = !hasPlotLine;
});