Highcharts test tool

by Torstein Hønsi

HTML

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

<div id="container" style="height: 300px"></div>

<button id="getextremes">Get extremes</button>

JavaScript

/**
 * Highcharts plugin to add Series.getExtremes
 *
 * Revised 2012-12-19, Torstein Hønsi
 */
(function (Highcharts, $) {
    Highcharts.Series.prototype.getExtremes = function () {
        var yMax = Math.max.apply(null, this.yData),
            xMax = this.xData[$.inArray(yMax, this.yData)],
            yMin = Math.min.apply(null, this.yData),
            xMin = this.xData[$.inArray(yMin, this.yData)];
        
        return {
            max: {
                x: xMax,
                y: yMax
            },
            min: {
                x: xMin,
                y: yMin
            }
        };
    };
}(Highcharts, jQuery));
     


// Run the chart
var chart = new Highcharts.Chart({

    chart: {
        renderTo: '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]
    }]

});
    
// Add the button
$('#getextremes').click(function () {
    console.log(chart.series[0].getExtremes());
});