Cannot read property 'get$rootScope' of null

[akserg]

I'm busy migrating Angular Dart UI on Angular 1.0 and it's really pain. Lack of documentation, simple example from you Master code doesn't work and generate exactly the same exception as I have:

NullError: Cannot call "get$rootScope" on null

STACKTRACE:
TypeError: Cannot read property 'get$rootScope' of null
    at BounceController.timeDigest$0 (http://localhost:8080/bouncing_balls.dart.js:21857:17)
    at BounceController.tick$0 (http://localhost:8080/bouncing_balls.dart.js:21907:12)
    at eval (eval at <anonymous> (http://localhost:8080/bouncing_balls.dart.js:2906:14), <anonymous>:2:37)
    at BounceController_requestAnimationFrame_closure.call$1 (http://localhost:8080/bouncing_balls.dart.js:21916:24)
    at _rootRunUnary (http://localhost:8080/bouncing_balls.dart.js:23641:14)
    at _ZoneDelegate.runUnary$3 (http://localhost:8080/bouncing_balls.dart.js:25746:39)
    at VmTurnZone__onRunUnary_closure.call$0 (http://localhost:8080/bouncing_balls.dart.js:12548:30)
    at VmTurnZone._onRunBase$4 (http://localhost:8080/bouncing_balls.dart.js:12416:17)
    at VmTurnZone._onRunUnary$5 (http://localhost:8080/bouncing_balls.dart.js:12436:19)
    at eval (eval at <anonymous> (http://localhost:8080/bouncing_balls.dart.js:2918:12), <anonymous>:2:46) 

My environment:

• Windows 7x64
• java version "1.7.0_67"
  Java(TM) SE Runtime Environment (build 1.7.0_67-b01)
  Java HotSpot(TM) 64-Bit Server VM (build 24.65-b04, mixed mode)
• Dart VM version: 1.6.0 (Tue Aug 26 22:40:07 2014) on "windows_x64"

What I can do wrong?

[vicb]

@akserg The issue with the Boucing Balls demo is that BounceController is not a directive and then the Scope is not injected by extending ScopeAware (ie BounceController.scope is never initialized).

FYI, We are in the process of updating the tutorial.

[akserg]

Ok, I made changes:

@Decorator(selector: "[bounce-controller]")
class BounceController implements ScopeAware {
...

And finally has similar, but slightly different exception:

Breaking on exception: The null object does not have a getter 'rootScope'.

The null object does not have a getter 'rootScope'.

NoSuchMethodError: method not found: 'rootScope'
Receiver: null
Arguments: []

STACKTRACE:
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:45)
#1      BounceController.timeDigest (http://localhost:8080/bouncing_balls.dart:76:11)
#2      tick (http://localhost:8080/bouncing_balls.dart:96:15)
#3      BounceController.requestAnimationFrame.<anonymous closure> (http://localhost:8080/bouncing_balls.dart:58:43)
#4      _rootRunUnary (dart:async/zone.dart:840)
#5      _ZoneDelegate.runUnary (dart:async/zone.dart:466)
#6      _onRunUnary.<anonymous closure> (package:angular/core/zone.dart:122:63)
#7      VmTurnZone._onRunBase (package:angular/core/zone.dart:104:16)
#8      _onRunUnary (package:angular/core/zone.dart:122:17)
#9      _CustomZone.runUnary (dart:async/zone.dart:748)
#10     _CustomZone.runUnaryGuarded (dart:async/zone.dart:656)
#11     _CustomZone.bindUnaryCallback.<anonymous closure> (dart:async/zone.dart:682)

What next?

[vicb]

see #1551

[akserg]

Yes, I check this out after send last comment.
My apologies.

[akserg]

So, I have copied your code over. Build is success and launch of index.html is success. When I choose bouncing_balls.html from list of available examples the program generates exception two times:

Unsupported operation: Infinity or NaN toInt

STACKTRACE:
#0      toInt (dart:core-patch/double.dart:136)
#1      Function.apply (dart:core-patch/function_patch.dart:28)
#2      _EvalWatchRecord.check (package:angular/change_detection/watch_group.dart:851:58)
#3      RootWatchGroup.detectChanges (package:angular/change_detection/watch_group.dart:420:29)
#4      RootScope.flush (package:angular/core/scope.dart:860:38)
#5      Scope.apply (package:angular/core/scope.dart:317:23)
#6      RootScope.RootScope.<anonymous closure> (package:angular/core/scope.dart:768:12)
#7      _rootRun (dart:async/zone.dart:829)
#8      _ZoneDelegate.run (dart:async/zone.dart:459)
#9      VmTurnZone._finishTurn (package:angular/core/zone.dart:168:21)
#10     VmTurnZone._onRunBase (package:angular/core/zone.dart:111:43)
#11     _onRunUnary (package:angular/core/zone.dart:122:17)
#12     _CustomZone.runUnary (dart:async/zone.dart:748)
#13     _CustomZone.runUnaryGuarded (dart:async/zone.dart:656)
#14     _CustomZone.bindUnaryCallback.<anonymous closure> (dart:async/zone.dart:682)

Seems fps variable could be equals 0, so I made next changes:

var fps = 60;
...
void tick() {
    var now = window.performance.now();
    var delay = now - lastTime;

    fps = (1000/delay).round();
    fps = fps == 0 ? 1 : fps;
    ...

Now it works as expected.
Thank you, Victor.

[vicb]

Thanks, I'll update the PR