A node cannot have such an event handler, because the nodes are dynamic (can be generated at render time, based on the content of a view, for example) and they are not controls.
But, they have a submitValue property. When the value of this property is not null, then a click generates an onItemClick event to it parent control. And the control can have a regular eventHandler. In the handler, ou then have to check for the submitted value to understand which node generated it.
There are multiple examples of this in the demo database.