How to always show the plotLine in HighCharts?

Question

I am creating a HighChart with a plotLine in it. The plotLine has a fixed value, while the data can vary between charts.

HighChart scales the y-axis automatically based on the maximum value of data, but it doesn't consider the plotLine's value in its calculations.

Hence, if the data range encompasses the plotLine value, the plotLine gets shown, but gets cropped out of the viewport if not.

Example:

$(function () {
    $(document).ready(function() {
        var chart = new Highcharts.Chart({
            chart: {
                renderTo: 'container',
                type: 'column'
            },
            title: {
                text: 'Dummy Data by Region'
            },
            xAxis: {
                categories: ['Africa', 'America', 'Asia']
            },
            yAxis: {
                plotLines:[{
                    value:450,
                    color: '#ff0000',
                    width:2,
                    zIndex:4,
                    label:{text:'goal'}
                }]
            },
            series: [{
                name: 'Year 1800',
                data: [107, 31, 650]
            }]
        });
    });

});​

JSFiddle for above code: http://jsfiddle.net/4R5HH/3/

The goal line (in red) is shown for the default data, but if I change the data to [107, 31, 250], then the plotLine goes out of the graph viewport and hence becomes invisible.

Answer 1

One other option that does not introduce data points:

yAxis: {
    minRange:450,
    min:0,
    plotLines:[{
        value:450,
        color: '#ff0000',
        width:2,
        zIndex:4,
        label:{text:'goal'}
    }]
},

This sets the minimum for the yAxis to 0 (this is unlikely to be false in this case) and the minimum Range to 450.

See updated fiddle.