Highcharts Demo

author(s): Torstein Hønsi

by Michel Penke

HTML

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

<div id="container"></div>

CSS

.chart {
    min-width: 320px;
    max-width: 800px;
    height: 220px;
    margin: 0 auto;
}

JavaScript

['mousemove', 'touchmove', 'touchstart'].forEach(function (eventType) {
    document.getElementById('container').addEventListener(
        eventType,
        function (e) {
            var chart,
                point,
                i,
                event;

            for (i = 0; i < Highcharts.charts.length; i = i + 1) {
                chart = Highcharts.charts[i];
                // Find coordinates within the chart
                event = chart.pointer.normalize(e);
                // Get the hovered point
                point = chart.series[0].searchPoint(event, true);

                if (point) {
                    point.highlight(e);
                }
            }
        }
    );
});

/**
 * Override the reset function, we don't need to hide the tooltips and
 * crosshairs.
 */
Highcharts.Pointer.prototype.reset = function () {
    return undefined;
};

/**
 * Highlight a point by showing tooltip, setting hover state and draw crosshair
 */
Highcharts.Point.prototype.highlight = function (event) {
    event = this.series.chart.pointer.normalize(event);
    this.onMouseOver(); // Show the hover marker
    this.series.chart.tooltip.refresh(this); // Show the tooltip
    this.series.chart.xAxis[0].drawCrosshair(event, this); // Show the crosshair
};

/**
 * Synchronize zooming through the setExtremes event handler.
 */
function syncExtremes(e) {
    var thisChart = this.chart;

    if (e.trigger !== 'syncExtremes') { // Prevent feedback loop
        Highcharts.each(Highcharts.charts, function (chart) {
            if (chart !== thisChart) {
                if (chart.xAxis[0].setExtremes) { // It is null while updating
                    chart.xAxis[0].setExtremes(
                        e.min,
                        e.max,
                        undefined,
                        false,
                        { trigger: 'syncExtremes' }
                    );
                }
            }
        });
    }
}

// Get the data. The contents of...