formatter property

dynamic formatter
getter/setter pair

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/xAxis.labels.formatter

Implementation

dynamic formatter;