formatter property
Callback JavaScript function to format the label. The value
is given by this.value
. Additional properties for this
are
axis
, chart
, isFirst
, isLast
and text
which holds the
value of the default formatter.
Defaults to a built in function returning a formatted string
depending on whether the axis is category
, datetime
,
numeric
or other.
API Docs: https://api.highcharts.com/highcharts/chart.parallelAxes.labels.formatter
Implementation
HighchartsCallback? formatter;