fix(compiler): elements with events only create binders but not protoElementInjectors.

Closes #577

modules/angular2/src/core/compiler/pipeline/element_binder_builder.js

@@ -98,7 +98,13 @@ export class ElementBinderBuilder extends CompileStep {
     var elementBinder = null;
     if (current.hasBindings) {
       var protoView = current.inheritedProtoView;
-      elementBinder = protoView.bindElement(current.inheritedProtoElementInjector,
+      var protoInjectorWasBuilt = isBlank(parent) ? true :
+          current.inheritedProtoElementInjector !== parent.inheritedProtoElementInjector;
+
+      var currentProtoElementInjector = protoInjectorWasBuilt ?
+          current.inheritedProtoElementInjector : null;
+
+      elementBinder = protoView.bindElement(currentProtoElementInjector,
         current.componentDirective, current.templateDirective);
 
       if (isPresent(current.textNodeBindings)) {

modules/angular2/test/core/compiler/pipeline/element_binder_builder_spec.js

@@ -52,9 +52,6 @@ export function main() {
               });
               hasBinding = true;
             }
-            if (isPresent(protoElementInjector)) {
-              current.inheritedProtoElementInjector = protoElementInjector;
-            }
             if (isPresent(current.element.getAttribute('directives'))) {
               hasBinding = true;
               for (var i=0; i<directives.length; i++) {
@@ -66,6 +63,13 @@ export function main() {
               current.hasBindings = true;
               DOM.addClass(current.element, 'ng-binding');
             }
+            if (isPresent(protoElementInjector) &&
+                (isPresent(current.element.getAttribute('text-binding')) ||
+                 isPresent(current.element.getAttribute('prop-binding')) ||
+                 isPresent(current.element.getAttribute('directives')) ||
+                 isPresent(current.element.getAttribute('event-binding')))) {
+              current.inheritedProtoElementInjector = protoElementInjector;
+            }
             if (isPresent(current.element.getAttribute('viewroot'))) {
               current.isViewRoot = true;
               current.inheritedProtoView = new ProtoView(current.element,
@@ -114,13 +118,28 @@ export function main() {
       var directives = [SomeDecoratorDirective];
       var protoElementInjector = new ProtoElementInjector(null, 0, directives);
 
-      var pipeline = createPipeline({protoElementInjector: protoElementInjector, directives: directives});
+      var pipeline = createPipeline({protoElementInjector: protoElementInjector,
+        directives: directives});
       var results = pipeline.process(el('<div viewroot directives></div>'));
       var pv = results[0].inheritedProtoView;
 
       expect(pv.elementBinders[0].protoElementInjector).toBe(protoElementInjector);
     });
 
+    it('should not store the parent protoElementInjector', () => {
+      var directives = [SomeDecoratorDirective];
+      var eventBindings = MapWrapper.createFromStringMap({
+        'event1': '1+1'
+      });
+
+      var pipeline = createPipeline({directives: directives, eventBindings: eventBindings});
+      var results = pipeline.process(el('<div viewroot directives><div event-binding></div></div>'));
+      var pv = results[0].inheritedProtoView;
+
+      expect(pv.elementBinders[1].protoElementInjector).toBeNull();
+    });
+
+
     it('should store the component directive', () => {
       var directives = [SomeComponentDirective];
       var pipeline = createPipeline({protoElementInjector: null, directives: directives});