Loading new Topology

• Would like to load a new Topology from back end system. (REST Interface). Started with the example from showcase: "Topology with remote Data". But the properties defined there is never touched by data... 

So changed the code to a getter and setter method..

 methods: {
            getTopo: function() {
            var result = this.view('topo').getData();
                return result;
            },
            setTopo: function (newTopo) {
                 this.view('topo').data(newTopo);
                 var c = this.getTopo();
            }
        }

When calling this function on app start everything works fine:

 (function (nx) {
    var App = nx.define(nx.ui.Application, {
        methods: {
            start: function() {
                node = new Tooltip.Node();      
                node.setTopo(initDataAlt);
                var model = new com.cisco.TopologyModel();
                node.attach(this);
                node.model(model);
            }
        }
    });

    new App().start();
})(nx);

• But when calling the setter from JavaScript Button Action to load a new Topology nothing happens.
• In Variable "newTopo" there is the new topologies loaded BUT in variable "c" there is still the old topology. 
• If changing the call to: "this.view('topo').setData(newTopo)" does not change anything.
• Is it needed to clear topo before setting again. If so how to do it.

 It's a better idea to use 'getTopo' to get the topology instance instead of getting topology data. In this case you're gonna have something like that: 

methods: {
     'getTopo': function(){
          return this.view('topo');
     }

 You'll be able to use any methods of nx.graphic.Topology class just having invoked .getTopo():

1. to update topology data: topologyContainer.getTopo().data(newTopo);

2. to read exisiting data: topologyContainer.getTopo().data(); 

Of course, you can also assign topologyContainer.getTopo() reference to a variable, like that...

var topo = topologyContainer.getTopo();

 ... and then use it, like that:

var topo = topologyContainer.getTopo();
$.ajax({
     type: 'GET',
     url: 'http://example.com/topology',
     dataType: 'json',
     // ... some other config ...

     success: function(data){
          // use try/catch to track parsing errors
          try {
               var data = JSON.parse(data);
               topo.data(data);
          }
          catch(SyntaxError){
               alert('hey, json is broken');
          }
     },
     error: function(jqXHR, exception){
          // some http erorr stuff
          alert("couldn't get topology from the server");
     }
});