How to limit dataLabels in highcharts?

Question

I want to limit number of datalabel thats showing on the chart. I have no clue how to do that. The chart it self has many data points, and i want to limit just datalabels for better reading. chart

   document.addEventListener('DOMContentLoaded', function() {
        dht22temp = Highcharts.chart('containerDHT22Temp', {
            chart: {
                type: 'spline',
                events: {
                    load: requestDataDHT22_Temp
                },
            },
            title: {
                text: 'DHT22 Temperatura'
            },
            xAxis: {
                type: 'datetime',
            },
            yAxis: {
                title: {
                    text: 'Temp',
                }
            },
            plotOptions: {
                spline: {
                    dataLabels: {
                        enabled: true,
                    },
                    enableMouseTracking: true
                }
            },
            series: [{
                name: 'Temp',
                data: [<?php echo join($dataDHT22Temp, ',') ?>],
            }],
            exporting: {
                buttons: {
                    contextButton: {
                        menuItems: ['printChart', 'downloadPNG', 'downloadJPEG', 'downloadPDF', 'downloadSVG']
                    }
                }
            }
        });
    });

Answer 1

Check dataLabels.formatter :

 Highcharts.chart('container', { chart: { type: 'line' }, title: { text: 'Monthly Average Temperature' }, subtitle: { text: 'Source: WorldClimate.com' }, xAxis: { categories: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'] }, yAxis: { title: { text: 'Temperature (°C)' } }, plotOptions: { line: { dataLabels: { enabled: true, formatter: function() { return this.point.index%3 == 0 ? this.y + '°C' : undefined; } }, enableMouseTracking: false } }, series: [{ name: 'Tokyo', data: [7.0, 6.9, 9.5, 14.5, 18.4, 21.5, 25.2, 26.5, 23.3, 18.3, 13.9, 9.6] }, { name: 'London', data: [3.9, 4.2, 5.7, 8.5, 11.9, 15.2, 17.0, 16.6, 14.2, 10.3, 6.6, 4.8] }] });

 .highcharts-figure, .highcharts-data-table table { min-width: 360px; max-width: 800px; margin: 1em auto; } .highcharts-data-table table { font-family: Verdana, sans-serif; border-collapse: collapse; border: 1px solid #EBEBEB; margin: 10px auto; text-align: center; width: 100%; max-width: 500px; } .highcharts-data-table caption { padding: 1em 0; font-size: 1.2em; color: #555; } .highcharts-data-table th { font-weight: 600; padding: 0.5em; } .highcharts-data-table td, .highcharts-data-table th, .highcharts-data-table caption { padding: 0.5em; } .highcharts-data-table thead tr, .highcharts-data-table tr:nth-child(even) { background: #f8f8f8; } .highcharts-data-table tr:hover { background: #f1f7ff; }

 <script src="https://code.highcharts.com/highcharts.js"></script> <script src="https://code.highcharts.com/modules/exporting.js"></script> <script src="https://code.highcharts.com/modules/export-data.js"></script> <script src="https://code.highcharts.com/modules/accessibility.js"></script> <figure class="highcharts-figure"> <div id="container"></div> <p class="highcharts-description"> This chart shows how data labels can be added to the data series. This can increase readability and comprehension for small datasets. </p> </figure>