These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
Feel free to search this API through the search bar or the navigation tree in the sidebar.
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. heatmap and tilemap supports
nullFormatter by default while the following series requires [#series.nullInteraction]
set to true: line, spline, area, area-spline, column,
bar, and timeline. Does not work with series that don't display
null points, like pie.