These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Fires when a drilldown point is clicked, before the new series is added. This
event is also utilized for async drilldown, where the seriesOptions are not
added by option, but rather loaded async. Note that when clicking a category
label to trigger multiple series drilldown, one
drilldown event is
triggered per point in the category.
category: If a category label was clicked, which index.
originalEvent: The original browser event (usually click) that triggered
point: The originating point.
points: If a category label was clicked, this array holds all points
corresponing to the category.
seriesOptions: Options for the new series.