Welcome to the Highcharts Stock JS (highstock) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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series.area.dataLabels.nullFormatter

Callback JavaScript function that defines formatting for points with the value of null. Works analogously to formatter. nullFormatter can be applied only to series which support displaying null points i.e heatmap or tilemap. Does not work with series that don't display null points, like line, column, bar or pie.