Highcharts Columnrange data labels high and low different colors

Question

In a basic Highcharts columnrange chart, how do I assign a color (blue) to the low values and a different color (red) to the high values?

The chart I am referring to is this one: http://jsfiddle.net/gh/get/jquery/1.7.2/highslide-software/highcharts.com/tree/master/samples/highcharts/demo/columnrange/

So for January the '-9.7' should be blue and the '9.4' should be red.

In a different example, I have tried this:

    series: [{
        name: 'Temperatures',
        data: [
           {low: 2, high: 6, color: 'green'},
           {low: 1, high: 9, color: 'yellow'},
           {low: -3, dataLabels: {color: 'red'}, high: 5, color: 'blue'},
           {low: 0, high: 7, color: 'orange'}
        ],
    color: '#b9deea',
    borderColor: '#92cbde',
    borderRadius: 4
    }]

But that changes the data label colour for both the low AND high value for the blue column to red.

Thanks in advance.

Baobab

Answer 1

Updated answer

In the formatter callback you can wrap text inside span and style it properly.

formatter: function () {
                    var color = this.y === this.point.high ? 'red' : 'blue';

                    return '<span style="color:' + color + '">' + this.y + '°C</span>';
                }

example: http://jsfiddle.net/6ofbr32b/1/

Coloring the points fragments

You have to split a point into two points - which will represent its negative and positive values, set threshold to 0 and negativeColor. Then adjust tooltip and data labels.

Splitting can be achieved in that way;

//plotOptions.columnRange
negativeColor: 'red',
threshold: 0,
borderWidth: 0,

//series
keys: ['x', 'low', 'high', 'part'],
  data: [
    [0,-9.7, 0, 'neg'],
    [0,0,9.4, 'pos'],
    [1,-8.7, 0, 'neg'],
    [1, 0, 6.5, 'pos'],
    [2,-3.5, 0, 'neg'],
    [2, 0, 9.4, 'pos'],
    [3,0.0, 22.6],
    [4,2.9, 29.5],
  ]

'part' is a helper which will be useful for adjusting tooltip and data labels.

Data labels so only one edge will be displayed if the points is split

dataLabels: {
      enabled: true,
      formatter: function() {
        if (this.point.part === 'neg' && this.y === this.point.low) {
            return this.y + '°C';
        } else if (this.point.part === 'pos' && this.point.high === this.y) {
            return this.y + '°C';
        } else if (!this.point.part) {
            return this.y + '°C';
        }
        return '';
      }
    }

and tooltip

tooltip: {
  pointFormatter: function () {
    var points = this.series.points,
            low = this.low,
        high = this.high;
    if (this.part === 'neg') {
        low = this.low;
      high = points[this.index + 1].high;
    } else if (this.part === 'pos') {
        low = points[this.index - 1].low;
      high = this.high;
    }
    return '<span style="color:' + this.series.color + '">\u25CF</span> ' + this.series.name + ': <b>' + low + '°C</b> - <b>' + high + '°C</b><br/>';
  }
},

example: http://jsfiddle.net/xdg67kuo/3/

It is also possible to achieve the desired effect with a stacked column chart: example