# Welcome to the Highcharts Gantt JS (gantt) Options Reference

These pages outline the chart configuration options, and the methods and properties of Highcharts objects.

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# navigator.yAxis.events.afterSetExtremes

As opposed to the `setExtremes` event, this event fires after the final min and max values are computed and corrected for `minRange`.

Fires when the minimum and maximum is set for the axis, either by calling the `.setExtremes()` method or by selecting an area in the chart. One parameter, `event`, is passed to the function, containing common event information.

The new user set minimum and maximum values can be found by `event.min` and `event.max`. These reflect the axis minimum and maximum in axis values. The actual data extremes are found in `event.dataMin` and `event.dataMax`.