# 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.

# series.gauge.data.colorIndex

A specific color index to use for the point, so its graphic representations are given the class name `highcharts-color-{n}`. In styled mode this will change the color of the graphic. In non-styled mode, the color by is set by the `fill` attribute, so the change in class name won't have a visual effect by default.