# Welcome to the Highcharts Maps JS (highmaps) Options Reference

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

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# series.geoheatmap.events.checkboxClick

Fires when the checkbox next to the series' name in the legend is clicked. One parameter, `event`, is passed to the function. The state of the checkbox is found by `event.checked`. The checked item is found by `event.item`. Return `false` to prevent the default action which is to toggle the select state of the series.