Reading extremes

by kzoon

HTML

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

<div id="container" style="height: 400px"></div>
<button id="button" class="autocompare">Get Y axis extremes</button>

JavaScript

const chart = Highcharts.chart('container', {
   chart: {
        type: 'line',
        zoomType: 'y'
    },
    yAxis:{
    max: 295
    },
    
    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]
    }]
});

var lbl;

// the button action
document.getElementById('button').addEventListener('click', e => {
    if(lbl) {lbl.destroy();}
    var extremes = chart.yAxis[0].getExtremes();

   this.lbl= chart.renderer.label(
        'dataMax: ' + extremes.dataMax + '<br/>' +
            'dataMin: ' + extremes.dataMin + '<br/>' +
            'max: ' + extremes.max + '<br/>' +
            'min: ' + extremes.min + '<br/>' +
            'userMax: ' + extremes.userMax + '<br/>' +
            'userMin: ' + extremes.userMin + '<br/>',
        100,
        100
    )
        .attr({
            fill: '#FCFFC5',
            zIndex: 8
        })
        .add();

    //e.target.disabled = true;
});