Using websockets/Server sent events with Angular dart - dart

Question

I was trying to use angular dart with websockets/server sent events and could not find any documentation/examples (there are some for angularJS but that seems very different for such things). A few things I tried also did not work.
Does anyone know how to do this?
Here is one version of what I tried and the error:
#NgController (
selector: "ACdistribution",
publishAs : "dstbn")
class ACDstbnController{
List <WtdPres> distbn;
void updateDstbn(List<WtdPres> newdstbn){
distbn = newdstbn;
}
final dstbnsrc = new EventSource("../dstbns")
..onMessage.listen((event){
List wps = JSON.decode(event.data);
List <WtdPres> newdistbn = wps.map((wp) => new WtdPres.fromJson(wp));
updateDstbn(newdistbn);
});
}
The error I got in pub build was:
web/provingground.dart:55:5:
'updateDstbn' is only available in instance methods.
updateDstbn(newdistbn);
^^^^^^^^^^^

Answer 1

There are limitations on what you can do on initializers for final fields.
Can you try to put this code inside the constructor
var dstbnsrc;
ACDstbnController() {
dstbnsrc = new EventSource("../dstbns")
..onMessage.listen((event){
List wps = JSON.decode(event.data);
List <WtdPres> newdistbn = wps.map((wp) => new WtdPres.fromJson(wp));
updateDstbn(newdistbn);
});
}