checkboxClick property
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.
API Docs: https://api.highcharts.com/highcharts/series.treegraph.events.checkboxClick
Implementation
HighchartsCallback? checkboxClick;