API Reference > ui-components > Tree > TreeEvents > onCheckboxStateChanged onCheckboxStateChanged MethodOptional Called when checkbox states for nodes are changed. If Subscription is returned it can be used to stop event handling by calling '.unsubscribe()'. onCheckboxStateChanged(event: TreeCheckboxStateChangeEvent): Subscription | undefined Parameter Type Description event TreeCheckboxStateChangeEvent Returns - Subscription | undefined Defined in ui/components/src/ui-components/tree/controlled/TreeEvents.ts Line 48 Last Updated: 13 June, 2024