Dynamic Column Chart Conditional Formatting

Dynamic Column Chart Conditional Formatting

by Emmanuel Umozurike

HTML

<script src="http://code.highcharts.com/highcharts.js"></script>
<script src="http://code.highcharts.com/modules/exporting.js"></script>
<div id="container" style="min-width: 400px; height: 400px; margin: 0 auto"></div>

JavaScript

$(function () {
    var chart;
    $(document).ready(function() {
        chart = new Highcharts.Chart({
            chart: {
                renderTo: 'container',
                type: 'column',
                events: {
                load: function (event) {
                    var theSeries = this.series[1];
                    var theCompSeries = this.series[0];
                    var theData = theSeries.data;
                    var theCompData = theCompSeries.data;

                    for (var i = 0; i < theData.length; i++) {
                        var theDataPoint = theData[i].y
                        var theCompDataPoint = theCompData[i].y;
                        if (theData[i].y < theCompData[i].y * 0.5) {
                            console.log(theSeries);
                            theSeries.points[i].update({
                                color: 'red'
                            });
                        }

                    }
                }
            }
            },
            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)'
                }
            },
            tooltip: {
                enabled: false,
                formatter: function() {
                    return '<b>'+ this.series.name +'</b><br/>'+
                        this.x +': '+ this.y +'°C';
                }
            },
            plotOptions: {
                column: {
                    dataLabels: {
                        enabled: true,
                        formatter: function() {
                            if (this.y != 0) {
                              this.series.color = "#FF00FF";
     ...