feat(ngValue): allow radio inputs to have non string values

Closes #816

src/AngularPublic.js

@@ -101,7 +101,8 @@ function publishExternalAPI(angular){
             ngChange: ngChangeDirective,
             ngModelInstant: ngModelInstantDirective,
             required: requiredDirective,
-            ngRequired: requiredDirective
+            ngRequired: requiredDirective,
+            ngValue: ngValueDirective
         }).
         directive(ngAttributeAliasDirectives).
         directive(ngEventDirectives);

src/directive/input.js

@@ -558,7 +558,7 @@ function radioInputType(scope, element, attr, ctrl) {
 
   ctrl.$render = function() {
     var value = attr.value;
-    element[0].checked = isDefined(value) && (value == ctrl.$viewValue);
+    element[0].checked = (value == ctrl.$viewValue);
   };
 
   attr.$observe('value', ctrl.$render);
@@ -1168,3 +1168,27 @@ var ngListDirective = function() {
     }
   };
 };
+
+
+var CONSTANT_VALUE_REGEXP = /^(true|false|\d+)$/;
+
+var ngValueDirective = [function() {
+  return {
+    priority: 100,
+    compile: function(tpl, attr) {
+      if (CONSTANT_VALUE_REGEXP.test(attr.ngValue)) {
+        return function(scope) {
+          attr.$set('value', scope.$eval(attr.ngValue));
+        };
+      } else {
+        attr.$observers.value = [];
+
+        return function(scope) {
+          scope.$watch(attr.ngValue, function(value) {
+            attr.$set('value', value, false);
+          });
+        };
+      }
+    }
+  };
+}];

src/service/compiler.js

@@ -732,7 +732,7 @@ function $CompileProvider($provide) {
           if (src[key]) {
             value += (key === 'style' ? ';' : ' ') + src[key];
           }
-          dst.$set(key, value, srcAttr[key]);
+          dst.$set(key, value, true, srcAttr[key]);
         }
       });
       // copy the new attributes on the old attrs object
@@ -937,9 +937,11 @@ function $CompileProvider($provide) {
      * can share the attribute. This function properly handles boolean attributes.
      * @param {string} key Normalized key. (ie ngAttribute)
      * @param {string|boolean} value The value to set. If `null` attribute will be deleted.
+     * @param {boolean=} writeAttr If false, does not write the value to DOM element attribute.
+     *     Defaults to true.
      * @param {string=} attrName Optional none normalized name. Defaults to key.
      */
-    function attrSetter(key, value, attrName) {
+    function attrSetter(key, value, writeAttr, attrName) {
       var booleanKey = isBooleanAttr(this.$element[0], key.toLowerCase());
 
       if (booleanKey) {
@@ -962,12 +964,15 @@ function $CompileProvider($provide) {
         }
       }
 
-      if (value === null || value === undefined) {
-        this.$element.removeAttr(attrName);
-      } else {
-        this.$element.attr(attrName, value);
+      if (writeAttr !== false) {
+        if (value === null || value === undefined) {
+          this.$element.removeAttr(attrName);
+        } else {
+          this.$element.attr(attrName, value);
+        }
       }
 
+
       // fire observers
       forEach(this.$observers[key], function(fn) {
         try {

test/directive/inputSpec.js

@@ -1078,4 +1078,42 @@ describe('input', function() {
       expect(scope.value).toBe('value3');
     }));
   });
+
+
+  describe('ng-value', function() {
+
+    it('should evaluate and set constant expressions', function() {
+      compileInput('<input type="radio" ng-model="selected" ng-value="true">' +
+                   '<input type="radio" ng-model="selected" ng-value="false">' +
+                   '<input type="radio" ng-model="selected" ng-value="1">');
+      scope.$digest();
+
+      browserTrigger(inputElm[0], 'click');
+      expect(scope.selected).toBe(true);
+
+      browserTrigger(inputElm[1], 'click');
+      expect(scope.selected).toBe(false);
+
+      browserTrigger(inputElm[2], 'click');
+      expect(scope.selected).toBe(1);
+    });
+
+
+    it('should watch the expression', function() {
+      compileInput('<input type="radio" ng-model="selected" ng-value="value">');
+
+      scope.$apply(function() {
+        scope.selected = scope.value = {some: 'object'};
+      });
+      expect(inputElm[0].checked).toBe(true);
+
+      scope.$apply(function() {
+        scope.value = {some: 'other'};
+      });
+      expect(inputElm[0].checked).toBe(false);
+
+      browserTrigger(inputElm, 'click');
+      expect(scope.selected).toBe(scope.value);
+    });
+  });
 });

test/service/compilerSpec.js

@@ -1401,7 +1401,7 @@ describe('$compile', function() {
 
 
       it('should allow overriding of attribute name and remember the name', function() {
-        attr.$set('ngOther', '123', 'other');
+        attr.$set('ngOther', '123', true, 'other');
         expect(element.attr('other')).toEqual('123');
         expect(attr.ngOther).toEqual('123');
 
@@ -1437,7 +1437,15 @@ describe('$compile', function() {
         attr.$set('ngMyAttr', 'value');
         attr.$set('ngMyAttr', null);
         expect(element.attr('ng-my-attr')).toBe(undefined);
-      })
+      });
+
+
+      it('should not set DOM element attr if writeAttr false', function() {
+        attr.$set('test', 'value', false);
+
+        expect(element.attr('test')).toBeUndefined();
+        expect(attr.test).toBe('value');
+      });
     });
   });