'A' tag widget and ng:click propagation change

* added a widget for A (anchor) tag, that modifies the default behavior
  and prevent default action (location change and page reload) for tags
  with empty href attribute
* stopped event propagation for all ng:click handlers

src/directives.js

@@ -198,13 +198,22 @@ angularWidget("@ng:repeat", function(expression, element){
   };
 });
 
+
+/*
+ * A directive that allows creation of custom onclick handlers that are defined as angular
+ * expressions and are compiled and executed within the current scope.
+ *
+ * Events that are handled via these handler are always configured not to propagate further.
+ *
+ * TODO: maybe we should consider allowing users to control even propagation in the future.
+ */
 angularDirective("ng:click", function(expression, element){
   return function(element){
     var self = this;
     element.bind('click', function(event){
       self.$tryEval(expression, element);
       self.$root.$eval();
-      event.preventDefault();
+      event.stopPropagation();
     });
   };
 });

src/widgets.js

@@ -340,3 +340,25 @@ var ngSwitch = angularWidget('ng:switch', function (element){
   },
   route: switchRouteMatcher
 });
+
+
+/*
+ * Modifies the default behavior of html A tag, so that the default action is prevented when href
+ * attribute is empty.
+ *
+ * The reasoning for this change is to allow easy creation of action links with ng:click without
+ * changing the location or causing page reloads, e.g.:
+ * <a href="" ng:click="model.$save()">Save</a>
+ */
+angular.widget('a', function() {
+  this.descend(true);
+  this.directives(true);
+
+  return function(element) {
+    if (element.attr('href') === '') {
+      element.bind('click', function(event){
+        event.preventDefault();
+      });
+    }
+  };
+});

test/directivesSpec.js

@@ -169,6 +169,19 @@ describe("directives", function(){
       element.trigger('click');
       expect(scope.$get('clicked')).toEqual(true);
     });
+
+    it('should stop event propagation', function() {
+      var scope = compile('<div ng:click="outer = true"><div ng:click="inner = true"></div></div>');
+      scope.$eval();
+      expect(scope.$get('outer')).not.toBeDefined();
+      expect(scope.$get('inner')).not.toBeDefined();
+
+      var innerDiv = jqLite(element.children()[0]);
+
+      innerDiv.trigger('click');
+      expect(scope.$get('outer')).not.toBeDefined();
+      expect(scope.$get('inner')).toEqual(true);
+    })
   });
 
   it('should ng:class', function(){

test/widgetsSpec.js

@@ -498,5 +498,40 @@ describe("widget", function(){
       expect(element.text()).toEqual('');
     });
   });
+
+  describe('a', function() {
+    it('should prevent default action to be executed when href is empty', function() {
+      var orgLocation = document.location.href,
+          preventDefaultCalled = false,
+          event;
+
+      compile('<a href="">empty link</a>');
+
+      if (msie) {
+
+        event = document.createEventObject();
+        expect(event.returnValue).not.toBeDefined();
+        element[0].fireEvent('onclick', event);
+        expect(event.returnValue).toEqual(false);
+
+      } else {
+
+        event = document.createEvent('MouseEvent');
+        event.initMouseEvent('click', true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, _null);
+
+        event.preventDefaultOrg = event.preventDefault;
+        event.preventDefault = function() {
+          preventDefaultCalled = true;
+          if (this.preventDefaultOrg) this.preventDefaultOrg();
+        };
+
+        element[0].dispatchEvent(event);
+
+        expect(preventDefaultCalled).toEqual(true);
+      }
+
+      expect(document.location.href).toEqual(orgLocation);
+    });
+  })
 });