These pages outline the chart configuration options, and the methods and properties of Highcharts objects.
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Callback function to format the text of the tooltip from scratch. In
case of single or shared tooltips, a string should
be returned. In case of split tooltips, it should
return an array where the first item is the header, and subsequent
items are mapped to the points. Return
false to disable tooltip for
a specific point on series.
A subset of HTML is supported. Unless
useHTML is true, the HTML of
the tooltip is parsed and converted to SVG, therefore this isn't a
complete HTML renderer. The following tags are supported:
<span>. Spans can be styled
style attribute, but only text-related CSS that is shared
with SVG is handled.
The available data in the formatter differ a bit depending on whether
the tooltip is shared or split, or belongs to a single point. In a
shared/split tooltip, all properties except
x, which is common for
all points, are kept in an array,
Available data are: