# JS API Reference

# Welcome to the Highcharts JS Options Reference

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

Feel free to search this API through the search bar or the navigation tree in the sidebar.

# chart.parallelAxes.events.setExtremes

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 data values. When an axis is zoomed all the way out from the "Reset zoom" button, `event.min` and `event.max` are null, and the new extremes are set based on `this.dataMin` and `this.dataMax`.