How to get node information after clicking in NeXt

Created a topology with some nodes. Would like to get node id when you click the node. 

// while topology is generated, I add selectNode event handler to each node

topo.on('topologyGenerated', function(sender, event) { 

  topo.eachNode(function(n){

                    n.on('selectNode', function(sender, event){

                            console.log(sender)

                        }

                    );

                },

                null);

}); 

Here are some sender information

1. _class:"node"
2. _content:r
3. _data-id:2
4. _enable:true
5. _enableSmartLabel:true
6. _label:"switch 3" 

 _data-id:2 is my target.

How to cast sender object to Node object and then get node id property

n.on('selectNode',
     function(sender, event){
         console.log(sender.id())
     }
);

Call sender.id() to get the id of the node.

Or You can just use clickNode to event get node's information.

 topo.on('clickNode',function(sender,node){

     console.log(node.id())

     console.log(node.model().data()) 

})