Language Reference Guide : Events : Collapsed Event
 
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Collapsed Event
The Collapsed event is sent when a node has been collapsed by user interaction.
This event has the following syntax:
on collapsed [treeviewfieldname]
The TriggerNode attribute identifies the node that was collapsed.
The Collapsed event occurs when an expanded node is collapsed by clicking the small “collapse” box [-] adjacent to the expanded node.
More information:
TriggerField Attribute