2 files changed, 31 insertions, 3 deletions

diff --git a/src/widgets.js b/src/widgets.js
index 09d743e9..42d56e20 100644
--- a/src/widgets.js
+++ b/src/widgets.js
@@ -35,16 +35,21 @@ function compileValidator(expr) {
 function valueAccessor(scope, element) {
   var validatorName = element.attr('ng-validate') || NOOP,
       validator = compileValidator(validatorName),
-      required = element.attr('ng-required'),
+      requiredExpr = element.attr('ng-required'),
       farmatterName = element.attr('ng-format') || NOOP,
       formatter = angularFormatter(farmatterName),
-      format, parse, lastError;
+      format, parse, lastError, required;
       invalidWidgets = scope.$invalidWidgets || {markValid:noop, markInvalid:noop};
   if (!validator) throw "Validator named '" + validatorName + "' not found.";
   if (!formatter) throw "Formatter named '" + farmatterName + "' not found.";
   format = formatter.format;
   parse = formatter.parse;
-  required = required || required === '';
+  if (requiredExpr) {
+    scope.$watch(requiredExpr, function(newValue) {required = newValue; validate();});
+  } else {
+    required = requiredExpr === '';
+  }
+  
 
   element.data('$validate', validate);
   return {
diff --git a/test/widgetsSpec.js b/test/widgetsSpec.js
index 17120682..dc6050b8 100644
--- a/test/widgetsSpec.js
+++ b/test/widgetsSpec.js
@@ -221,6 +221,29 @@ describe("widget", function(){
       expect(element.attr('ng-validation-error')).toEqual('Required');
     });
 
+    it('should allow conditions on ng-required', function() {
+      compile('<input type="text" name="price" ng-required="ineedz"/>');
+      scope.$set('ineedz', false);
+      scope.$eval();
+      expect(element.hasClass('ng-validation-error')).toBeFalsy();
+      expect(element.attr('ng-validation-error')).toBeFalsy();
+
+      scope.$set('price', 'xxx');
+      scope.$eval();
+      expect(element.hasClass('ng-validation-error')).toBeFalsy();
+      expect(element.attr('ng-validation-error')).toBeFalsy();
+
+      scope.$set('ineedz', true);
+      scope.$eval();
+      expect(element.hasClass('ng-validation-error')).toBeFalsy();
+      expect(element.attr('ng-validation-error')).toBeFalsy();
+
+      element.val('');
+      element.trigger('keyup');
+      expect(element.hasClass('ng-validation-error')).toBeTruthy();
+      expect(element.attr('ng-validation-error')).toEqual('Required');
+    });
+
     it("should process ng-required2", function() {
       compile('<textarea name="name">Misko</textarea>');
       expect(scope.$get('name')).toEqual("Misko");