fix(radio): no longer prevents events from nested elements

closes #2960

Author: rschmukler

src/components/radioButton/radio-button.js

@@ -95,7 +95,17 @@ function mdRadioGroupDirective($mdUtil, $mdConstant, $mdTheming, $timeout) {
      */
     function keydownListener(ev) {
       var keyCode = ev.which || ev.keyCode;
-      switch(keyCode) {
+
+      // Only listen to events that we originated ourselves
+      // so that we don't trigger on things like arrow keys in
+      // inputs.
+
+      if (keyCode != $mdConstant.KEY_CODE.ENTER &&
+          ev.currentTarget != ev.target) {
+        return;
+      }
+
+      switch (keyCode) {
         case $mdConstant.KEY_CODE.LEFT_ARROW:
         case $mdConstant.KEY_CODE.UP_ARROW:
           ev.preventDefault();
@@ -117,6 +127,7 @@ function mdRadioGroupDirective($mdUtil, $mdConstant, $mdTheming, $timeout) {
           }
           break;
       }
+
     }
   }
 

src/components/radioButton/radio-button.spec.js

@@ -106,7 +106,9 @@ describe('radioButton', function() {
     var rbGroupElement = element.eq(0);
     rbGroupElement.triggerHandler({
       type: 'keydown',
-      keyCode: $mdConstant.KEY_CODE.RIGHT_ARROW
+      keyCode: $mdConstant.KEY_CODE.RIGHT_ARROW,
+      currentTarget: rbGroupElement[0],
+      target: rbGroupElement[0]
     });
 
     expect($rootScope.color).toEqual('green');
@@ -143,7 +145,9 @@ describe('radioButton', function() {
     element.triggerHandler('mousedown');
     element.triggerHandler({
       type: 'keydown',
-      keyCode: $mdConstant.KEY_CODE.DOWN_ARROW
+      keyCode: $mdConstant.KEY_CODE.DOWN_ARROW,
+      currentTarget: element[0],
+      target: element[0]
     });
     expect(element[0]).toHaveClass('md-focused');
   }));
@@ -257,6 +261,8 @@ describe('radioButton', function() {
       function rightArrow() {
           rbGroupElement.triggerHandler({
             type: 'keydown',
+            target: rbGroupElement[0],
+            currentTarget: rbGroupElement[0],
             keyCode: $mdConstant.KEY_CODE.RIGHT_ARROW
           });
         }