How to override the keyboard copy function?

GoJS
5

Thank you for your answer. I had use the Model.copyNodeDataFunction in this way :

    myDiagram.model.copyNodeDataFunction = function(obj,model){
        var a = {}; 
         a.stockNo= "stockNo";
         a.category= obj.category; 
         a.text2= obj.text2;
         a.pos= obj.pos;
         a.size= obj.size;
        return a;
    }

The “a” object is the new object . If I don’t give “a” the id property , the new node will not have the property.